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Chemical attacks and structural spalling dominated the degradation process of the refractory lining in refining ladle. In the present work, we have fabricated a cement-free gel-bonded corundum-spinel castables and examined the degradation behavior in contact with the molten steel/slag. Further, the role of infiltrated steel/slag associated with cracks on the spalling behavior were elucidated. The stress cracks formed on the corroded interface, providing a permeation pathway for molten corrosive species and acting as a sub-surface for further corrosion. Infiltrated steel contributed to the formation of composite (Mg, Fe)Al2O4 spinel and led to an additional corrosion and induced a large structural spalling. Besides, macro-scale structural spalling of the refractory lining and microscale spalling of aluminate aggregates were discussed in detail, respectively.
Yaping Cheng; Yu Zhang; Yuanyuan Li; Junfeng Chen; Junli Xiao; Yaowu Wei; Guangping Liu; Guangqiang Li; ShaoWei Zhang; Nan Li. Degradation behaviors of cement-free corundum-spinel castables in Ruhrstahl Heraeus refining ladle: Role of infiltrated steel. Ceramics International 2021, 1 .
AMA StyleYaping Cheng, Yu Zhang, Yuanyuan Li, Junfeng Chen, Junli Xiao, Yaowu Wei, Guangping Liu, Guangqiang Li, ShaoWei Zhang, Nan Li. Degradation behaviors of cement-free corundum-spinel castables in Ruhrstahl Heraeus refining ladle: Role of infiltrated steel. Ceramics International. 2021; ():1.
Chicago/Turabian StyleYaping Cheng; Yu Zhang; Yuanyuan Li; Junfeng Chen; Junli Xiao; Yaowu Wei; Guangping Liu; Guangqiang Li; ShaoWei Zhang; Nan Li. 2021. "Degradation behaviors of cement-free corundum-spinel castables in Ruhrstahl Heraeus refining ladle: Role of infiltrated steel." Ceramics International , no. : 1.
Nano-whiskers based 3D Si3N4 porous ceramics (3D-NWSNPC) with high-porosity (about 91–93 %), low density (0.17–0.25 g/cm3), low thermal conductivity, and a certain degree of recoverability under cyclic compressive loading and reasonably strengths were prepared at 1423–1523 K via a one-pot foam-gelcasting/nitridation route using inexpensive commercial Si powders as starting materials and hexadecyl trimethyl ammonium bromide as foaming agent. After nitridation at 1523 K, the sample with an original solid loading of 12.5 wt% exhibited the highest compressive strength of 1.9 MPa, even though its density was lowered to 0.25 g/cm3. The sample nitrided at 1473 K had a relative density of 7.3 %. Its compressive and specific strength were respectively 1.1 MPa and 5.5 MPa·cm3 g−1, and its thermal conductivity was as low as 0.074 W/(m K) (measured at 323 K). These outstanding properties would make the as-prepared 3D-NWSNPC a promising candidate for applications in catalysis, filtration, thermal insulation and many other important areas.
Lei Han; Yu Chen; Hong Chang; Faliang Li; Cheng Liu; Tommy Shyng; Yanqiu Zhu; Guangqiang Li; Haijun Zhang; Quanli Jia; ShaoWei Zhang. One-pot foam-gelcasting/nitridation synthesis of high porosity nano-whiskers based 3D Si3N4 porous ceramics. Journal of the European Ceramic Society 2021, 41, 6070 -6074.
AMA StyleLei Han, Yu Chen, Hong Chang, Faliang Li, Cheng Liu, Tommy Shyng, Yanqiu Zhu, Guangqiang Li, Haijun Zhang, Quanli Jia, ShaoWei Zhang. One-pot foam-gelcasting/nitridation synthesis of high porosity nano-whiskers based 3D Si3N4 porous ceramics. Journal of the European Ceramic Society. 2021; 41 (12):6070-6074.
Chicago/Turabian StyleLei Han; Yu Chen; Hong Chang; Faliang Li; Cheng Liu; Tommy Shyng; Yanqiu Zhu; Guangqiang Li; Haijun Zhang; Quanli Jia; ShaoWei Zhang. 2021. "One-pot foam-gelcasting/nitridation synthesis of high porosity nano-whiskers based 3D Si3N4 porous ceramics." Journal of the European Ceramic Society 41, no. 12: 6070-6074.
Demand for energy saving in steelmaking process, lightweight refractories have attracted great attentions for the excellent thermal insulation. In this study, the corrosion behavior of the lightweight magnesia in the high basicity tundish slag was explored, and compared with that of fused magnesia. The results show that the impurities in the fused magnesia caused more dissolution of magnesia into slag after 60 min. Different from fused magnesia, the penetration layer was found in the lightweight magnesia, where the intercrystalline CaZrO3‐ZrO2 phases were dissolved by the slag. The micropores in the lightweight magnesia provided passages for slag infiltration, but also accelerated the supersaturation of slag in refractory and impeded the mass transfer. Furthermore, the residual CaZrO3‐ZrO2 phases in transition layer hindered the further slag infiltration. After 60 min holding, the MgO content in molten slag contacted with lightweight magnesia was lower, implying that the lightweight magnesia is the promising refractory for tundish lining.
Chong Tan; Yu Liu; Guangqiang Li; Cheng Yuan; Yufeng Tian; Yongshun Zou; Ao Huang. Corrosion Behavior of Lightweight MgO in High Basicity Tundish Slag. steel research international 2021, 92, 1 .
AMA StyleChong Tan, Yu Liu, Guangqiang Li, Cheng Yuan, Yufeng Tian, Yongshun Zou, Ao Huang. Corrosion Behavior of Lightweight MgO in High Basicity Tundish Slag. steel research international. 2021; 92 (8):1.
Chicago/Turabian StyleChong Tan; Yu Liu; Guangqiang Li; Cheng Yuan; Yufeng Tian; Yongshun Zou; Ao Huang. 2021. "Corrosion Behavior of Lightweight MgO in High Basicity Tundish Slag." steel research international 92, no. 8: 1.
The present study was envisaged to investigate the role of La content on the particle, microstructure and toughness in the simulated coarse-grained heat-affected zone (CGHAZ) of high-strength low-alloy steels. Three steels with La content of 0.016 wt.%, 0.046 wt.% and 0.093 wt.% were prepared and simulated in a 100 kJ/cm heat input welding thermal cycle. Subsequently, the particle and microstructure of selected specimens were characterized and the impact absorb energy was measured at −20 °C. The results indicated that the La2O2S inclusions in 0.016 wt.%-La steel were gradually modified to LaS-LaP in 0.046 wt.%-La steel and to LaP in 0.093 wt.%-La steel. A higher fraction of acicular ferrite was obtained in the simulated CGHAZ of 0.016 wt.%-La steel, since the inclusion of La2O2S was more powerful to induce the formation of acicular ferrite. Furthermore, the fraction of M-A constituents in the simulated CGHAZ increased with increasing La content. The impact toughness in the simulated CGHAZ of 0.016 wt.%-La steel was the highest, owing to the high fraction of the fine-grained acicular ferrite and low fraction of M-A constituent.
Yuxin Cao; Xiangliang Wan; Feng Zhou; Hangyu Dong; Kaiming Wu; Guangqiang Li. The critical influence of La content on the microstructure-toughness relationship in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels. Metallurgical Research & Technology 2021, 118, 212 .
AMA StyleYuxin Cao, Xiangliang Wan, Feng Zhou, Hangyu Dong, Kaiming Wu, Guangqiang Li. The critical influence of La content on the microstructure-toughness relationship in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels. Metallurgical Research & Technology. 2021; 118 (2):212.
Chicago/Turabian StyleYuxin Cao; Xiangliang Wan; Feng Zhou; Hangyu Dong; Kaiming Wu; Guangqiang Li. 2021. "The critical influence of La content on the microstructure-toughness relationship in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels." Metallurgical Research & Technology 118, no. 2: 212.
To reduce the Mn vaporization during recycling rejected electrolytic manganese metal by electroslag remelting, it is proposed to reduce the temperature of molten slag pool, but which leads to the degradation of slag desulfurization. The desulfurization by interaction between CaF2–CaO–Al2O3–Na2O slag and rejected electrolytic manganese metal scrap was studied from the view of thermodynamics in this study. The results show that sulfur distribution ratio decreases with increase of CaF2 content, and increases with the increase of Na2O content and temperature. Na2O increases sulfur distribution ratio of slag by increasing CaO activity. Na2O addition in CaF2–CaO–Al2O3–Na2O slag can enhance desulfurization ability of slag due to the larger sulfur distribution ratio and lower viscosity. Thus, sulfur content in test of slag T3 bearing 45.8 wt% CaF2-23.2 wt% CaO-22.7 wt% Al2O3-8.3 wt% Na2O is much lower than that of slag without Na2O, implying that 45.8 wt% CaF2-23.2 wt% CaO-22.7 wt% Al2O3-8.3 wt%Na2O slag is the promising slag for recycling rejected electrolytic manganese metal by ESR.
Yu Liu; Guangqiang Li; Qiang Wang; Ru Lu; Xijie Wang; Yufeng Tian. Effect of slag composition on desulfurization during recycling rejected electrolytic manganese metal by electroslag remelting. Metallurgical Research & Technology 2021, 118, 206 .
AMA StyleYu Liu, Guangqiang Li, Qiang Wang, Ru Lu, Xijie Wang, Yufeng Tian. Effect of slag composition on desulfurization during recycling rejected electrolytic manganese metal by electroslag remelting. Metallurgical Research & Technology. 2021; 118 (2):206.
Chicago/Turabian StyleYu Liu; Guangqiang Li; Qiang Wang; Ru Lu; Xijie Wang; Yufeng Tian. 2021. "Effect of slag composition on desulfurization during recycling rejected electrolytic manganese metal by electroslag remelting." Metallurgical Research & Technology 118, no. 2: 206.
The effects of Nb content on precipitation, microstructure, texture and magnetic properties of primary recrystallized grain-oriented silicon steel were investigated by various methods. The results show that the precipitates in primary recrystallized sheets are mainly MnS, Nb(C,N), composite precipitates of MnS and AlN, and composite precipitates of Nb(C,N) and AlN. Adding niobium could refine the primary recrystallized microstructure. The steel with 0.009 wt% Nb possesses the finest and the most dispersed precipitates, which contributes to the finest primary recrystallized microstructure due to the strong pinning force. Adding niobium is beneficial to obtain large volume fraction favorable texture for grain-oriented silicon steel, and the effect of Nb addition is not obvious when the content is higher than 0.009 wt%. After final annealing, the steel with 0.009 wt% Nb shows the best magnetic properties, B800 = 1.872 T, P1.7/50 = 1.25 W/kg.
Yong Wang; Chengyi Zhu; Guangqiang Li; Yulong Liu; Yu Liu. Influence of Nb Content on Precipitation, Grain Microstructure, Texture and Magnetic Properties of Grain-Oriented Silicon Steel. Materials 2020, 13, 5581 .
AMA StyleYong Wang, Chengyi Zhu, Guangqiang Li, Yulong Liu, Yu Liu. Influence of Nb Content on Precipitation, Grain Microstructure, Texture and Magnetic Properties of Grain-Oriented Silicon Steel. Materials. 2020; 13 (23):5581.
Chicago/Turabian StyleYong Wang; Chengyi Zhu; Guangqiang Li; Yulong Liu; Yu Liu. 2020. "Influence of Nb Content on Precipitation, Grain Microstructure, Texture and Magnetic Properties of Grain-Oriented Silicon Steel." Materials 13, no. 23: 5581.
In the present study, the comprehensive analyses based on the numerical simulation, in situ observation, and metallographic detection were carried out for the roll core of GCr15/45 carbon steel composite roll manufactured by the new electroslag remelting cladding (ESRC) method. During the ESRC process, the temperature distributions at the different radial and longitudinal positions of the roll core have great changes due to the different degrees of heat conduction from the slag bath, as a result, various microstructure and properties were obtained at the different positions of the roll core. The results illustrated that the ESRC process tended to be stable as the composite height reached a certain value and the high-temperature austenitization process mainly occurred in the radial regions where R > 60 mm, whereas no significant changes occurred at the areas where R ≦ 60 mm. The coarse grains and few Widmanstatten structures with proeutectoid ferrite were generated in the roll core areas near the bimetallic interface, while the fine grains with more proeutectoid ferrite were obtained in the roll core area away from the interface. Therefore, a higher tensile strength and a better plasticity were obtained for the specimens away from the interface.
Yulong Cao; Guangqiang Li; Zhouhua Jiang; Yanwu Dong; Zhengrong Zhao; Chenrui Niu. Microstructure evolution of roll core during the preparation of composite roll by electroslag remelting cladding technology. High Temperature Materials and Processes 2020, 39, 270 -280.
AMA StyleYulong Cao, Guangqiang Li, Zhouhua Jiang, Yanwu Dong, Zhengrong Zhao, Chenrui Niu. Microstructure evolution of roll core during the preparation of composite roll by electroslag remelting cladding technology. High Temperature Materials and Processes. 2020; 39 (1):270-280.
Chicago/Turabian StyleYulong Cao; Guangqiang Li; Zhouhua Jiang; Yanwu Dong; Zhengrong Zhao; Chenrui Niu. 2020. "Microstructure evolution of roll core during the preparation of composite roll by electroslag remelting cladding technology." High Temperature Materials and Processes 39, no. 1: 270-280.
A numerical simulation based on the coupling of electromagnetic-fluid-thermal analysis was developed to investigate the effects of electrode immersion depth (EID) on the electrical resistance and heat generation in the electroslag remelting (ESR) process. The total electric current was obtained by integrating the current density at the slag/metal interface, and the electrical resistance is the ratio of potential to current. It indicates that the EID variation changes the shape, size, and current path of the slag pool, and, as a result, the current density, heat generation, and melting power are directly proportional to the EID, while the electrical resistance of the slag pool is inversely proportional to the EID. The distance between the electrode and the molten-metal pool and the contact areas between the electrode and the slag are the main factors affecting the distribution of voltage, current density, Joule heating, and temperature in the slag pool of the ESR process. A change in the current density affects the electrical resistance and heat generation, which has a direct effect on the ESR process.
Yulong Cao; Guangqiang Li; Zhouhua Jiang; Yanwu Dong; Zhengrong Zhao; Chenrui Niu. Effect of Electrode Immersion Depth on the Electrical Resistance and Heat Generation in the Electroslag Remelting Process. JOM 2020, 72, 3826 -3835.
AMA StyleYulong Cao, Guangqiang Li, Zhouhua Jiang, Yanwu Dong, Zhengrong Zhao, Chenrui Niu. Effect of Electrode Immersion Depth on the Electrical Resistance and Heat Generation in the Electroslag Remelting Process. JOM. 2020; 72 (11):3826-3835.
Chicago/Turabian StyleYulong Cao; Guangqiang Li; Zhouhua Jiang; Yanwu Dong; Zhengrong Zhao; Chenrui Niu. 2020. "Effect of Electrode Immersion Depth on the Electrical Resistance and Heat Generation in the Electroslag Remelting Process." JOM 72, no. 11: 3826-3835.
In order to reveal the mechanism of galvanic pitting corrosion initiation induced by typical complex inclusions in Al-Ti-Mg deoxidized high strength pipeline steel, first-principles calculations, combining with immersion tests, scanning electron microscopy was used to study the correlation between electronic work function and galvanic corrosion of Al-Ti-Mg killed steel. The results show that MnS inclusions act as anodes in the electrochemical environment, preferentially corroding and dissolving; MgAl2O4 and Al2O3 inclusions act as cathodes, leading to the corrosion of Fe matrix; different end planes of MgTiO3 and MgTi2O4 act as both anodes and cathodes, but they have little effect on pitting corrosion. Microcrevices on the MgTiO3 and MgTi2O4 inclusions boundary are the main cause of matrix dissolution.
Yanhui Hou; Jingru Wang; Linli Liu; Guangqiang Li; Dongyu Zhai. Mechanism of pitting corrosion induced by inclusions in Al-Ti-Mg deoxidized high strength pipeline steel. Micron 2020, 138, 102898 .
AMA StyleYanhui Hou, Jingru Wang, Linli Liu, Guangqiang Li, Dongyu Zhai. Mechanism of pitting corrosion induced by inclusions in Al-Ti-Mg deoxidized high strength pipeline steel. Micron. 2020; 138 ():102898.
Chicago/Turabian StyleYanhui Hou; Jingru Wang; Linli Liu; Guangqiang Li; Dongyu Zhai. 2020. "Mechanism of pitting corrosion induced by inclusions in Al-Ti-Mg deoxidized high strength pipeline steel." Micron 138, no. : 102898.
In order to understand the influence of the geometry of ceramic filter orifices on the movement of micro-scale inclusions, a transient 3D coupled numerical model has been established. The inclusion trajectory was described using the two-way coupled Euler-Lagrange approach. The gravity, buoyancy, drag, virtual mass, lift, pressure gradient, centrifugal forces, and moment of inertia were taken into account. The random walk module was invoked to include the chaotic effect of the turbulence. For estimating the collision and coalescence of the inclusion, the stochastic collision module was utilized. Besides, three detachment criteria have been introduced to represent the adherence behavior between the inclusion and the refractory wall. Necessary measurements were carried out for validating the model experimentally. Due to the swirling flow and the centrifugal effect, the inclusion removal ratio of the helical orifice is 31.02%, which is higher than the value of 16.35% associated with the straight orifice.
Qiang Wang; Yu Liu; Ao Huang; Wen Yan; Huazhi Gu; Guangqiang Li. CFD investigation on influence of orifice geometry on micro-scale inclusion movement. Powder Technology 2020, 367, 358 -375.
AMA StyleQiang Wang, Yu Liu, Ao Huang, Wen Yan, Huazhi Gu, Guangqiang Li. CFD investigation on influence of orifice geometry on micro-scale inclusion movement. Powder Technology. 2020; 367 ():358-375.
Chicago/Turabian StyleQiang Wang; Yu Liu; Ao Huang; Wen Yan; Huazhi Gu; Guangqiang Li. 2020. "CFD investigation on influence of orifice geometry on micro-scale inclusion movement." Powder Technology 367, no. : 358-375.
The viscosity of slag is a key factor affecting metallurgical efficiency and recycling, such as metal-slag reaction and separation, as well as slag wool processing. In order to comprehensively clarify the variation of the slag viscosity, various data mining methods have been employed to predict the viscosity of the slag. In this study, a more advanced dual-stage predictive modeling approach is proposed in order to accurately analyze and predict the viscosity of slag. Compared with the traditional single data mining approach, the proposed method performs better with a higher recall rate and low misclassification rate. The simulation results show that temperature, SiO2, Al2O3, P2O5, and CaO have greater influences on the slag’s viscosity. The critical temperature for onset of the important influence of slag composition is 980 °C. Furthermore, it is found that SiO2 and P2O5 have positive correlations with slag’s viscosity, while temperature, Al2O3, and CaO have negative correlations. A two-equation model of six-degree polynomial combined with Arrhenius formula is also established for the purpose of providing theoretical guidance for industrial application and reutilization of slag.
Ao Huang; Yanzhu Huo; Juan Yang; Huazhi Gu; Guangqiang Li. Computational Modeling and Prediction on Viscosity of Slags by Big Data Mining. Minerals 2020, 10, 257 .
AMA StyleAo Huang, Yanzhu Huo, Juan Yang, Huazhi Gu, Guangqiang Li. Computational Modeling and Prediction on Viscosity of Slags by Big Data Mining. Minerals. 2020; 10 (3):257.
Chicago/Turabian StyleAo Huang; Yanzhu Huo; Juan Yang; Huazhi Gu; Guangqiang Li. 2020. "Computational Modeling and Prediction on Viscosity of Slags by Big Data Mining." Minerals 10, no. 3: 257.
The decarburisation annealing processes of Nb-bearing grain-oriented silicon steel under different conditions were conducted. The effect of nitriding and decarburisation annealing time on the carbon content, precipitates, microstructure and texture of Nb-bearing grain-oriented silicon steel were investigated by the various analysis methods. The results show that the carbon content in the steel decreases as decarburisation time increasing, and decreases below 0.003% eventually. Larger number density and smaller size of precipitates were obtained in the sample treated by nitriding before decarburisation annealing process, leading to fine and uniform microstructure, which is beneficial to obtain excellent magnetic properties for Nb-bearing grain-oriented silicon steel. The main texture types of the experimental samples were γ-fibres with a peak at {111}. The nitriding before decarburisation annealing process makes little effect on texture evolution during decarburisation annealing process.
Yong Wang; Chengyi Zhu; Guangqiang Li; Yulong Liu; Yu Liu. Effect of decarburisation and nitriding on the carbon content, precipitates, microstructure and texture of Nb-bearing grain-oriented silicon steel. Materials at High Temperatures 2020, 37, 155 -164.
AMA StyleYong Wang, Chengyi Zhu, Guangqiang Li, Yulong Liu, Yu Liu. Effect of decarburisation and nitriding on the carbon content, precipitates, microstructure and texture of Nb-bearing grain-oriented silicon steel. Materials at High Temperatures. 2020; 37 (3):155-164.
Chicago/Turabian StyleYong Wang; Chengyi Zhu; Guangqiang Li; Yulong Liu; Yu Liu. 2020. "Effect of decarburisation and nitriding on the carbon content, precipitates, microstructure and texture of Nb-bearing grain-oriented silicon steel." Materials at High Temperatures 37, no. 3: 155-164.
In order to solve the problem of where, why, and how to start pitting, it is necessary to study the influence of different dissolution activity of the internal heterogeneous structures of the complex inclusions. In this paper, mechanism of internal activity difference of two typical Yttrium composite inclusions on pitting corrosion is revealed from atomic scale by using immersion test, FE-SEM/EDS analysis and first-principles calculations. The results show that, for Mg-Y-S composite inclusions, pitting potential is lower than that of the matrix, therefore, The matrix around the composite inclusions dissolves preferentially; for Y-S-O composite inclusions with core-shell structure, Y-O inclusions in the shell are deformed and cracked due to the internal stress of the matrix and Y-S during the immersion process, resulting in the simultaneous dissolution of inclusions and steel matrix.
Yanhui Hou; Tengfei Li; Guangqiang Li; Changgui Cheng. Mechanism of Yttrium composite inclusions on the localized corrosion of pipeline steels in NaCl solution. Micron 2019, 130, 102820 .
AMA StyleYanhui Hou, Tengfei Li, Guangqiang Li, Changgui Cheng. Mechanism of Yttrium composite inclusions on the localized corrosion of pipeline steels in NaCl solution. Micron. 2019; 130 ():102820.
Chicago/Turabian StyleYanhui Hou; Tengfei Li; Guangqiang Li; Changgui Cheng. 2019. "Mechanism of Yttrium composite inclusions on the localized corrosion of pipeline steels in NaCl solution." Micron 130, no. : 102820.
The oxidation behavior and sub‐surface phase transformation of novel high Mn cryogenic steel Fe‐(0.35‐0.45)C‐(0.2‐0.25)Si‐(25‐25.8)Mn‐(3‐5)Cr were investigated in the temperature range of 600‐1200 oC under air atmosphere. The results show that the weight gain curves of oxidation with time are in good agreement with linear equations during 90 minutes holding below 800 oC, implying that the interface reaction is the rate‐controlling process. Above 900 oC, the oxidation reaction kinetics is governed by the parabolic rate law due to the formation of thick oxide scale. The inner oxide scale mainly consisting of Cr oxide at 1000 oC is thicker than that at 900 oC, but the thickness of the whole oxide scale is thinner than that at 900 oC. After 90 min holding, the oxidation weight gain at 900 oC is more than that at 1000 oC, which is dominated by the combined effect of thermodynamic and kinetic factors. The Mn depleted zone occurs in the steel matrix epidermis, leading to the sub‐surface phase transformation. The γ‐Fe transforms into α‐Fe in the steel matrix epidermis, which will result in deterioration of steel properties. Protective atmosphere should be adopted for heat treatment process of the novel high Mn steel. This article is protected by copyright. All rights reserved.
Yu Liu; Yong Wang; Guangqiang Li; Huan Cai; Honghong Wang; Xiangliang Wan. Oxidation Behavior and Subsurface Phase Transformation of Novel High Mn Cryogenic Steel during Heat Treatment. steel research international 2019, 91, 1 .
AMA StyleYu Liu, Yong Wang, Guangqiang Li, Huan Cai, Honghong Wang, Xiangliang Wan. Oxidation Behavior and Subsurface Phase Transformation of Novel High Mn Cryogenic Steel during Heat Treatment. steel research international. 2019; 91 (4):1.
Chicago/Turabian StyleYu Liu; Yong Wang; Guangqiang Li; Huan Cai; Honghong Wang; Xiangliang Wan. 2019. "Oxidation Behavior and Subsurface Phase Transformation of Novel High Mn Cryogenic Steel during Heat Treatment." steel research international 91, no. 4: 1.
In this work, Fe2SiO4/SiO2 coated Fe-Si soft magnetic composites (SMCs) have been prepared successfully via ball milling Fe-6.5wt%Si/Fe3O4 composite particles combined with subsequent spark plasma sintering (SPS) process. The formation mechanism of Fe2SiO4/SiO2 insulating layer and effect of Fe3O4 coating content on the microstructure and properties for the Fe-Si SMCs were investigated in detail. It is interesting that high temperature SPS process would lead to the occurrence of redox reactions between Fe3O4 and Si from Fe-Si alloy cores, and resulted in the transformation from Fe3O4 coating layer to Fe2SiO4/SiO2 insulating layer. As a consequence, the novel Fe-Si SMCs exhibited superior performances including high saturation magnetization (190.4 emu/g) and low core loss (9.02 mW/cm3 at 10 kHz) decreased by 89.1% compared to that of the uncoated Fe-Si SMCs (83.08 mW/cm3 at 10 kHz). The results indicated that the method of preparing insulating layer by the redox reactions is a simple and effective way to synthesize new SMCs with high performance for electro-magnetic energy conversion equipments.
Zigui Luo; Xi'an Fan; Wentao Hu; Fan Luo; Jian Wang; Zhaoyang Wu; Xin Liu; Guangqiang Li; Yawei Li. Properties of Fe2SiO4/SiO2 coated Fe-Si soft magnetic composites prepared by sintering Fe-6.5wt%Si/Fe3O4 composite particles. Journal of Magnetism and Magnetic Materials 2019, 499, 166278 .
AMA StyleZigui Luo, Xi'an Fan, Wentao Hu, Fan Luo, Jian Wang, Zhaoyang Wu, Xin Liu, Guangqiang Li, Yawei Li. Properties of Fe2SiO4/SiO2 coated Fe-Si soft magnetic composites prepared by sintering Fe-6.5wt%Si/Fe3O4 composite particles. Journal of Magnetism and Magnetic Materials. 2019; 499 ():166278.
Chicago/Turabian StyleZigui Luo; Xi'an Fan; Wentao Hu; Fan Luo; Jian Wang; Zhaoyang Wu; Xin Liu; Guangqiang Li; Yawei Li. 2019. "Properties of Fe2SiO4/SiO2 coated Fe-Si soft magnetic composites prepared by sintering Fe-6.5wt%Si/Fe3O4 composite particles." Journal of Magnetism and Magnetic Materials 499, no. : 166278.
Four microporous mullite-corundum refractory aggregates were prepared from Al(OH)3 and kaolinite gangue through an in-situ decomposition synthesis technique. The effect of the compacting pressure (30–150 MPa) on the microstructure and strength were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The higher compacting pressure limited the rearrangement of Al(OH)3 pseudomorphs during the reaction sintering process and promoted the reaction between Al(OH)3 and kaolinite gangue, leading to the formation of closed mullite layers on the surface of Al(OH)3 pseudomorphs. The pore size distributions of all four microporous aggregates were bimodal with closed pores (0.1–1.0 μm) located inside of the Al(OH)3 pseudomorphs, whereas open pores (1.0–10.0 μm) were found between the pseudomorphs. When the compacting pressure was 150 MPa, the microporous mullite-corundum refractory aggregates had a high total porosity of 40.5%, a highly closed porosity of 16.2%, median pore size of only 0.74 μm as well as an excellent compressive strength of 103.2 MPa.
Jiangtao Qi; Wen Yan; Zhe Chen; Stefan Schafföner; Wenying Zhou; Guangqiang Li; Qiang Wang. Preparation and characterization of microporous mullite-corundum refractory aggregates with high strength and closed porosity. Ceramics International 2019, 46, 8274 -8280.
AMA StyleJiangtao Qi, Wen Yan, Zhe Chen, Stefan Schafföner, Wenying Zhou, Guangqiang Li, Qiang Wang. Preparation and characterization of microporous mullite-corundum refractory aggregates with high strength and closed porosity. Ceramics International. 2019; 46 (6):8274-8280.
Chicago/Turabian StyleJiangtao Qi; Wen Yan; Zhe Chen; Stefan Schafföner; Wenying Zhou; Guangqiang Li; Qiang Wang. 2019. "Preparation and characterization of microporous mullite-corundum refractory aggregates with high strength and closed porosity." Ceramics International 46, no. 6: 8274-8280.
Multi-hole ceramic filter is regarded as an effective and cheap method of additional flow control device in tundish. In order to evaluate the performance of the ceramic filter, a transient three-dimensional (3D) comprehensive numerical model has been developed to study the flow pattern, temperature distribution and residence time of the molten steel, as well as the elimination of inclusion in a full size two-strand tundish. One-way coupled Euler–Lagrange approach with random walk model was adopted to track the inclusion motion trajectory. The gravity, buoyancy, drag, virtual mass, lift, pressure gradient, and rebound forces were included. The inclusion Reynolds number was utilized for the judgment of the inclusion separation at the slag-steel interface and the internal surface of the filter hole. Besides, the residence time distribution curve has been analyzed for figuring out the macroscopic mixing of the molten steel. The results indicate that the ceramic filter increases the flow resistance of the molten steel in the tundish, resulting in a longer residence time and a higher temperature drop. Except removed by the covering molten slag, the inclusion could also be trapped by the filter hole when the molten steel travels through the ceramic filter. The elimination of the smaller inclusion is significantly improved. The removal ratio of the 1 μm inclusion in the tundish without ceramic filter is only 59.3 pct, while the value is improved to 65.3 pct if we apply the ceramic filter with slenderness ratio of 3 to the tundish. And with the slenderness ratio changing from 3 to 5, the removal ratio of the 1 μm inclusion increases from 65.3 to 72.0 pct. Additionally, the ceramic filter could counteract certain side effects of the increasing inclusion density on the removal, especially for the smaller inclusion. With the inclusion density increasing from 3990 to 5000 kg/m3, the removal ratio of the 1 μm inclusion decreases by 14.5 pct in the tundish without ceramic filter, and after using the ceramic filter, the removal ratio decreases by 13.0, 7.4, and 5.0 pct with the slenderness ratio varies from 3 to 5.
Qiang Wang; Yu Liu; Ao Huang; Wen Yan; Huazhi Gu; Guangqiang Li. CFD Investigation of Effect of Multi-hole Ceramic Filter on Inclusion Removal in a Two-Strand Tundish. Metallurgical and Materials Transactions A 2019, 51, 276 -292.
AMA StyleQiang Wang, Yu Liu, Ao Huang, Wen Yan, Huazhi Gu, Guangqiang Li. CFD Investigation of Effect of Multi-hole Ceramic Filter on Inclusion Removal in a Two-Strand Tundish. Metallurgical and Materials Transactions A. 2019; 51 (1):276-292.
Chicago/Turabian StyleQiang Wang; Yu Liu; Ao Huang; Wen Yan; Huazhi Gu; Guangqiang Li. 2019. "CFD Investigation of Effect of Multi-hole Ceramic Filter on Inclusion Removal in a Two-Strand Tundish." Metallurgical and Materials Transactions A 51, no. 1: 276-292.
Zigui Luo; Xi'an Fan; Wentao Hu; Fan Luo; Guangqiang Li; Yawei Li; Jian Wang; Xin Liu. Effect of sintering temperature on microstructure and magnetic properties for Fe-Si soft magnetic composites prepared by water oxidation combined with spark plasma sintering. Journal of Magnetism and Magnetic Materials 2019, 491, 1 .
AMA StyleZigui Luo, Xi'an Fan, Wentao Hu, Fan Luo, Guangqiang Li, Yawei Li, Jian Wang, Xin Liu. Effect of sintering temperature on microstructure and magnetic properties for Fe-Si soft magnetic composites prepared by water oxidation combined with spark plasma sintering. Journal of Magnetism and Magnetic Materials. 2019; 491 ():1.
Chicago/Turabian StyleZigui Luo; Xi'an Fan; Wentao Hu; Fan Luo; Guangqiang Li; Yawei Li; Jian Wang; Xin Liu. 2019. "Effect of sintering temperature on microstructure and magnetic properties for Fe-Si soft magnetic composites prepared by water oxidation combined with spark plasma sintering." Journal of Magnetism and Magnetic Materials 491, no. : 1.
In order to clarify the effect of graphite content on the corrosion behavior of MgO–C refractories immersed in MnO-rich slag, the MgO–C refractory samples bearing 5 wt%, 10 wt% and 15 wt% graphite were prepared, and exposed in the slag composed of 40 wt% CaO, 40 wt% SiO2 and 20 wt% MnO. The results show that metallic Mn particles and (Mg,Mn)O solid solution are formed at the slag/refractories interface. Whereas, no dense layer is formed by (Mg,Mn)O solid solution at the interface. The decrease in MnO content of slag is mainly attributed to the reaction with graphite to form liquid Mn. The graphite is found in the slag, and dissolved in the form of oxidation. The poor wetting limits the contact area of graphite and slag, reducing graphite oxidation and decarburized area. The graphite does not become the passage for slag to penetrate into the refractories due to the oxidation. On the contrary, the dissolution of MgO in slag is faster than graphite, thus is mainly responsible for the degradation of refractories. As a result, MnO and MgO contents change less in the slag contacted with the refractories bearing higher graphite content.
Yu Liu; Qiang Wang; Guangqiang Li; Jinshuai Zhang; Wen Yan; Ao Huang. Role of graphite on the corrosion resistance improvement of MgO–C bricks to MnO-rich slag. Ceramics International 2019, 46, 7517 -7522.
AMA StyleYu Liu, Qiang Wang, Guangqiang Li, Jinshuai Zhang, Wen Yan, Ao Huang. Role of graphite on the corrosion resistance improvement of MgO–C bricks to MnO-rich slag. Ceramics International. 2019; 46 (6):7517-7522.
Chicago/Turabian StyleYu Liu; Qiang Wang; Guangqiang Li; Jinshuai Zhang; Wen Yan; Ao Huang. 2019. "Role of graphite on the corrosion resistance improvement of MgO–C bricks to MnO-rich slag." Ceramics International 46, no. 6: 7517-7522.
The novel concept of phase reversion involving severe cold deformation of austenite to martensite, followed by annealing when martensite reverts to austenite was used to obtain fine-grained (FG) 18Cr–8Ni austenitic stainless steel with high strength-high elongation combination. Through the application of the concept, the objective of the study is to study the deformation behavior and mechanism of austenitic stainless steel at elevated temperatures in the range of 25 °C–800 °C and compare with the as-received coarse-grained (CG) 18Cr–8Ni steel counterpart. The study clearly underscored that with the increase of temperature from 25 °C to 800 °C, the deformation mechanism in CG steel varied from TRIP at 25 °C, TWIP at 200 °C, dislocation slip at 600 °C to dynamic recrystallization + grain boundary sliding at 800 °C. Whereas, the deformation mechanisms in FG steel varied from primary TRIP + minor TWIP at 25 °C, primary TWIP + minor TRIP at 200 °C, primary grain boundary sliding + minor dislocation slip + TWIP at 600 °C to grain boundary sliding + dynamic recrystallization at 800 °C. The difference in deformation mechanism between CG and FG steels is a grain size effect and is related to the increase grain boundary density and stability of austenite with decrease in grain size.
D.M. Xu; Guangqiang Li; X.L. Wan; R.D.K. Misra; J.X. Yu; G. Xu. On the deformation mechanism of austenitic stainless steel at elevated temperatures: A critical analysis of fine-grained versus coarse-grained structure. Materials Science and Engineering: A 2019, 773, 138722 .
AMA StyleD.M. Xu, Guangqiang Li, X.L. Wan, R.D.K. Misra, J.X. Yu, G. Xu. On the deformation mechanism of austenitic stainless steel at elevated temperatures: A critical analysis of fine-grained versus coarse-grained structure. Materials Science and Engineering: A. 2019; 773 ():138722.
Chicago/Turabian StyleD.M. Xu; Guangqiang Li; X.L. Wan; R.D.K. Misra; J.X. Yu; G. Xu. 2019. "On the deformation mechanism of austenitic stainless steel at elevated temperatures: A critical analysis of fine-grained versus coarse-grained structure." Materials Science and Engineering: A 773, no. : 138722.