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Additive manufacturing is a valid solution to build complex geometries, including lightweight structures. Among these, gyroids offer a viable concept for bone tissue application, although many preliminary trials would be required to validate the design before actual implantation. In this frame, this study is aimed at presenting the background and the steps to build a numerical simulation to extract the mechanical behaviour of the structure, thus reducing the experimental effort. The results of the simulation are compared to the actual outcome resulting from quasi-static compressive tests and the effectiveness of the model is measured with reference to similar studies presented in the literature about other lightweight structures.
Fabrizia Caiazzo; Diego Gonzalo Guillen; Vittorio Alfieri. Simulation of the Mechanical Behaviour of Metal Gyroids for Bone Tissue Application. Materials 2021, 14, 4808 .
AMA StyleFabrizia Caiazzo, Diego Gonzalo Guillen, Vittorio Alfieri. Simulation of the Mechanical Behaviour of Metal Gyroids for Bone Tissue Application. Materials. 2021; 14 (17):4808.
Chicago/Turabian StyleFabrizia Caiazzo; Diego Gonzalo Guillen; Vittorio Alfieri. 2021. "Simulation of the Mechanical Behaviour of Metal Gyroids for Bone Tissue Application." Materials 14, no. 17: 4808.
In the last few decades, complex light-weight designs have been successfully produced via additive manufacturing (AM), launching a new era in the thinking–design process. In addition, current software platforms provide design tools combined with multi-scale simulations to exploit all the technology benefits. However, the literature highlights that several stages must be considered in the design for additive manufacturing (DfAM) process, and therefore, performing holistic guided-design frameworks become crucial to efficiently manage the process. In this frame, this paper aims at providing the main optimization, design, and simulation tools to minimize the number of design evaluations generated through the different workflow assessments. Furthermore, DfAM phases are described focusing on the implementation of design optimization strategies as topology optimization, lattice infill optimization, and generative design in earlier phases to maximize AM capabilities. In conclusion, the current challenges for the implementation of the workflow are hence described.
Nicolas Sbrugnera Sotomayor; Fabrizia Caiazzo; Vittorio Alfieri. Enhancing Design for Additive Manufacturing Workflow: Optimization, Design and Simulation Tools. Applied Sciences 2021, 11, 6628 .
AMA StyleNicolas Sbrugnera Sotomayor, Fabrizia Caiazzo, Vittorio Alfieri. Enhancing Design for Additive Manufacturing Workflow: Optimization, Design and Simulation Tools. Applied Sciences. 2021; 11 (14):6628.
Chicago/Turabian StyleNicolas Sbrugnera Sotomayor; Fabrizia Caiazzo; Vittorio Alfieri. 2021. "Enhancing Design for Additive Manufacturing Workflow: Optimization, Design and Simulation Tools." Applied Sciences 11, no. 14: 6628.
This paper is aimed at investigating the process of Directed Energy Deposition of steel wire to the purpose of maintenance and repair: this technology is receiving increasing interest in the frame of Additive Manufacturing and has been investigated for different metals and different substrates. An experimental plan has been designed here to investigate the dependence of the geometry on the governing factors in single-track deposition and quantify the depth of the affection in the substrate in terms of geometrical dilution and variation of the micro-hardness.
Fabrizia Caiazzo; Vittorio Alfieri. Directed Energy Deposition of stainless steel wire with laser beam: evaluation of geometry and affection depth. Procedia CIRP 2021, 99, 348 -351.
AMA StyleFabrizia Caiazzo, Vittorio Alfieri. Directed Energy Deposition of stainless steel wire with laser beam: evaluation of geometry and affection depth. Procedia CIRP. 2021; 99 ():348-351.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri. 2021. "Directed Energy Deposition of stainless steel wire with laser beam: evaluation of geometry and affection depth." Procedia CIRP 99, no. : 348-351.
Bone tissue engineering has evolved owing to new opportunities of deep customisation offered by additive manufacturing technologies. Gyroid structures, which have been widely used for energy absorption or chemical catalysis, are now being employed as biomorphic structures as well to provide customer-oriented scaffolds for missing or injured bones. Unfortunately, limited data in terms of manufacturability and mechanical properties are available in the literature to support a wide application scope, because the bone to match is strongly dependent on the individual. Therefore, the study aimed at addressing this lack of knowledge, assessing the manufacturability of metal gyroids and further developing the correlation of the structural response with the designed geometry, so to allow the designer to provide the proper biomorphic structure on a case-by-case basis. Biocompatible steel was used to manufacture samples via laser powder-bed fusion; their elastic moduli and yield strengths were evaluated as a function of the orientation of the elementary cells, the symmetry and the wall thickness based on compression testing. Grounds have been given to support potential applications for tibias and vertebras.
Fabrizia Caiazzo; Vittorio Alfieri; Brahim David Bujazha. Additive manufacturing of biomorphic scaffolds for bone tissue engineering. The International Journal of Advanced Manufacturing Technology 2021, 113, 2909 -2923.
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Brahim David Bujazha. Additive manufacturing of biomorphic scaffolds for bone tissue engineering. The International Journal of Advanced Manufacturing Technology. 2021; 113 (9-10):2909-2923.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Brahim David Bujazha. 2021. "Additive manufacturing of biomorphic scaffolds for bone tissue engineering." The International Journal of Advanced Manufacturing Technology 113, no. 9-10: 2909-2923.
Laser powder bed fusion (LPBF) can fabricate products with tailored mechanical and surface properties. In fact, surface texture, roughness, pore size, the resulting fractional density, and microhardness highly depend on the processing conditions, which are very difficult to deal with. Therefore, this paper aims at investigating the relevance of the volumetric energy density (VED) that is a concise index of some governing factors with a potential operational use. This paper proves the fact that the observed experimental variation in the surface roughness, number and size of pores, the fractional density, and Vickers hardness can be explained in terms of VED that can help the investigator in dealing with several process parameters at once.
Fabrizia Caiazzo; Vittorio Alfieri; Giuseppe Casalino. On the Relevance of Volumetric Energy Density in the Investigation of Inconel 718 Laser Powder Bed Fusion. Materials 2020, 13, 538 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Giuseppe Casalino. On the Relevance of Volumetric Energy Density in the Investigation of Inconel 718 Laser Powder Bed Fusion. Materials. 2020; 13 (3):538.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Giuseppe Casalino. 2020. "On the Relevance of Volumetric Energy Density in the Investigation of Inconel 718 Laser Powder Bed Fusion." Materials 13, no. 3: 538.
One of the main current challenges in the field of additive manufacturing and directed energy deposition of metals, is the need for simulation tools to prevent or reduce the need to adopt a trial-and-error approach to find the optimum processing conditions. A valuable help is offered by numerical simulation, although setting-up and validating a reliable model is challenging, due to many issues related to the laser source, the interaction with the feeding metal, the evolution of the material properties and the boundary conditions. Indeed, many attempts have been reported in the literature, although some issues are usually simplified or neglected. Therefore, this paper is aimed at building a comprehensive numerical model for the process of laser-assisted deposition. Namely: the geometry of the deposited metal is investigated in advance and the most effective reference shape is found to feed the simulation as a function of the governing factors for single- and multi-track, multi-layer deposition; then, a non-stationary thermal model is proposed and the underlying hypotheses to simulate the addition of metal are discussed step-by-step. Validation is eventually conducted, based on experimental evidence. Aluminum alloy 2024 is chosen as feeding metal and substrate.
Fabrizia Caiazzo; Vittorio Alfieri. Simulation of Laser-assisted Directed Energy Deposition of Aluminum Powder: Prediction of Geometry and Temperature Evolution. Materials 2019, 12, 2100 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri. Simulation of Laser-assisted Directed Energy Deposition of Aluminum Powder: Prediction of Geometry and Temperature Evolution. Materials. 2019; 12 (13):2100.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri. 2019. "Simulation of Laser-assisted Directed Energy Deposition of Aluminum Powder: Prediction of Geometry and Temperature Evolution." Materials 12, no. 13: 2100.
With the development of additive manufacturing, the building of new categories of lightweight structures such as random foams have been offered. Nevertheless, given the complexity of the required parts, macroscopic defects may result or the process may even fail. Therefore, proper actions must be taken at the design stage. In this paper, a method of design for additive manufacturing (DfAM) to build metal random foam structures is proposed. Namely, a procedure is suggested to generate a structure that has interconnected porosity. This procedure is based on the aimed fractional density and several technical requirements, and then the geometry is optimized and meshed. To validate the algorithm, a test article consisting of a metal cylinder with spherical random pores ranging from 1 to 6 mm in diameter with a resulting fractional density of 40 ± 2% has been conceived and manufactured by means of laser powder bed fusion (LPBF). On the basis of the outcome of the manufacturing process, crucial information has been gathered to update the algorithm.
Nicola Contuzzi; Sabina Luisa Campanelli; Fabrizia Caiazzo; Vittorio Alfieri. Design and Fabrication of Random Metal Foam Structures for Laser Powder Bed Fusion. Materials 2019, 12, 1301 .
AMA StyleNicola Contuzzi, Sabina Luisa Campanelli, Fabrizia Caiazzo, Vittorio Alfieri. Design and Fabrication of Random Metal Foam Structures for Laser Powder Bed Fusion. Materials. 2019; 12 (8):1301.
Chicago/Turabian StyleNicola Contuzzi; Sabina Luisa Campanelli; Fabrizia Caiazzo; Vittorio Alfieri. 2019. "Design and Fabrication of Random Metal Foam Structures for Laser Powder Bed Fusion." Materials 12, no. 8: 1301.
The modeling of laser-based processes is increasingly addressed in a competitive environment for two main reasons: Preventing a trial-and-error approach to set the optimum processing conditions and non-destructive real-time control. In this frame, a thermal model for laser heating in the form of non-penetrative bead-on-plate welds of aluminum alloy 2024 is proposed in this paper. A super-Gaussian profile is considered for the transverse optical intensity and a number of laws for temperature-dependent material properties have been included aiming to improve the reliability of the model. The output of the simulation in terms of both thermal evolution of the parent metal and geometry of the fusion zone is validated in comparison with the actual response: namely, a two-color pyrometer is used to infer the thermal history on the exposed surface around the scanning path, whereas the shape and size of the fusion zone are assessed in the transverse cross-section. With an average error of 3% and 4%, the model is capable of predicting the peak temperature and the depth of the fusion zone upon laser heating, respectively. The model is intended to offer a comprehensive description of phenomena in laser heating in preparation for a further model for repairing via additive manufacturing.
Fabrizia Caiazzo; Vittorio Alfieri. Simulation of Laser Heating of Aluminum and Model Validation via Two-Color Pyrometer and Shape Assessment. Materials 2018, 11, 1506 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri. Simulation of Laser Heating of Aluminum and Model Validation via Two-Color Pyrometer and Shape Assessment. Materials. 2018; 11 (9):1506.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri. 2018. "Simulation of Laser Heating of Aluminum and Model Validation via Two-Color Pyrometer and Shape Assessment." Materials 11, no. 9: 1506.
The subject of repairing Ni-based parts with state-of-the-art technologies is increasingly addressed both for research and industrial purposes, aiming to cost saving mainly in aerospace and automotive. In this frame, laser-aided Directed Metal Deposition (DMD) with injection of powder is investigated in this paper since minimal distortion of the work-piece, reduced heat-affected zones and better surface quality are benefited in comparison with conventional techniques. Actual application to overhaul Ni-based components is aimed, therefore homologous powder is fed by means of a 3-way feeding nozzle over the substrate; a disc laser is used as heat source. The chemical composition of both the substrate and the powder is preliminarily investigated via areal and punctual EDS inspections. A 2-factor, 2-level experimental plan is drawn to discuss the main effects of the processing variables laser power and processing speed. Namely, the resulting trends are given and compared with similar findings in the literature. Interestingly, dilution as a measure of metal affection is found to be lower than 25%, hence the operating window is deemed to be suitable for both repairing and fabrication of parts. Eventually, repairing by means of side overlapping and multi-level deposition traces on artificial square-shaped grooves is performed: indeed, similar slots are made before DMD to preliminarily remove any local imperfection upon improper casting of the part in the actual industrial process. Although a number of micropores are found, the process is deemed to comply with usual referred standards; in particular, a proper processing window has been found to prevent the occurrence of hot cracking which usually affects the compliance to stress.
Fabrizia Caiazzo. Laser-aided Directed Metal Deposition of Ni-based superalloy powder. Optics & Laser Technology 2018, 103, 193 -198.
AMA StyleFabrizia Caiazzo. Laser-aided Directed Metal Deposition of Ni-based superalloy powder. Optics & Laser Technology. 2018; 103 ():193-198.
Chicago/Turabian StyleFabrizia Caiazzo. 2018. "Laser-aided Directed Metal Deposition of Ni-based superalloy powder." Optics & Laser Technology 103, no. : 193-198.
Laser welding of titanium alloys is attracting increasing interest as an alternative to traditional joining techniques for industrial applications, with particular reference to the aerospace sector, where welded assemblies allow for the reduction of the buy-to-fly ratio, compared to other traditional mechanical joining techniques. In this research work, an investigation on laser welding of Ti–6Al–4V alloy plates is carried out through an experimental testing campaign, under different process conditions, in order to perform a characterization of the produced weld bead geometry, with the final aim of developing a cognitive methodology able to support decision-making about the selection of the suitable laser welding process parameters. The methodology is based on the employment of artificial neural networks able to identify correlations between the laser welding process parameters, with particular reference to the laser power, welding speed and defocusing distance, and the weld bead geometric features, on the basis of the collected experimental data.
Fabrizia Caiazzo; Alessandra Caggiano. Investigation of Laser Welding of Ti Alloys for Cognitive Process Parameters Selection. Materials 2018, 11, 632 .
AMA StyleFabrizia Caiazzo, Alessandra Caggiano. Investigation of Laser Welding of Ti Alloys for Cognitive Process Parameters Selection. Materials. 2018; 11 (4):632.
Chicago/Turabian StyleFabrizia Caiazzo; Alessandra Caggiano. 2018. "Investigation of Laser Welding of Ti Alloys for Cognitive Process Parameters Selection." Materials 11, no. 4: 632.
Laser direct metal deposition is an advanced additive manufacturing technology suitably applicable in maintenance, repair, and overhaul of high-cost products, allowing for minimal distortion of the workpiece, reduced heat affected zones, and superior surface quality. Special interest is growing for the repair and coating of 2024 aluminum alloy parts, extensively utilized for a wide range of applications in the automotive, military, and aerospace sectors due to its excellent plasticity, corrosion resistance, electric conductivity, and strength-to-weight ratio. A critical issue in the laser direct metal deposition process is related to the geometrical parameters of the cross-section of the deposited metal trace that should be controlled to meet the part specifications. In this research, a machine learning approach based on artificial neural networks is developed to find the correlation between the laser metal deposition process parameters and the output geometrical parameters of the deposited metal trace produced by laser direct metal deposition on 5-mm-thick 2024 aluminum alloy plates. The results show that the neural network-based machine learning paradigm is able to accurately estimate the appropriate process parameters required to obtain a specified geometry for the deposited metal trace.
Fabrizia Caiazzo; Alessandra Caggiano. Laser Direct Metal Deposition of 2024 Al Alloy: Trace Geometry Prediction via Machine Learning. Materials 2018, 11, 444 .
AMA StyleFabrizia Caiazzo, Alessandra Caggiano. Laser Direct Metal Deposition of 2024 Al Alloy: Trace Geometry Prediction via Machine Learning. Materials. 2018; 11 (3):444.
Chicago/Turabian StyleFabrizia Caiazzo; Alessandra Caggiano. 2018. "Laser Direct Metal Deposition of 2024 Al Alloy: Trace Geometry Prediction via Machine Learning." Materials 11, no. 3: 444.
In the framework of Additive Manufacturing of metals, Directed Energy Deposition of steel powder over flat surfaces and edges has been investigated in this paper. The aims are the repair and overhaul of actual, worn-out, high price sensitive metal components. A full-factorial experimental plan has been arranged, the results have been discussed in terms of geometry, microhardness and thermal affection as functions of the main governing parameters, laser power, scanning speed and mass flow rate; dilution and catching efficiency have been evaluated as well to compare quality and effectiveness of the process under conditions of both flat and edge depositions. Convincing results are presented to give grounds for shifting the process to actual applications: namely, no cracks or pores have been found in random cross-sections of the samples in the processing window. Interestingly an effect of the scanning conditions has been proven on the resulting hardness in the fusion zone; therefore, the mechanical characteristics are expected to depend on the processing parameters.
Fabrizia Caiazzo; Vittorio Alfieri. Laser-Aided Directed Energy Deposition of Steel Powder over Flat Surfaces and Edges. Materials 2018, 11, 435 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri. Laser-Aided Directed Energy Deposition of Steel Powder over Flat Surfaces and Edges. Materials. 2018; 11 (3):435.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri. 2018. "Laser-Aided Directed Energy Deposition of Steel Powder over Flat Surfaces and Edges." Materials 11, no. 3: 435.
A number of innovative technologies are offered in the literature to the purpose of additive manufacturing. Among them, directed metal deposition of wire by means of laser beam is receiving increasing interest since important advantages are benefited in comparison with its powder-based counterpart. Nevertheless, a number of issues must be addressed: this paper aims to provide further understanding of the technology to give grounds to actual applications in an industrial environment. Single trace deposition of Ti-6Al-4V wire over homologous substrate is investigated; the laser power, the processing speed, and the amount of fed metal is changed. The geometrical responses (i.e., trace width, height, depth, shape angle, and dilution) in the cross-section are investigated as a function of the processing parameters. Namely, a global clear view of the responses is given as a function of power and deposited wire mass per unit time. Furthermore, possible occurrence of micro pores is discussed with respect to common international standards. Eventually, an investigation about changes in both the microstructure and the microhardness is addressed: an increase of hardness in the fusion zone is noticed as a consequence of non-diffusional martensitic transformation of the original α-β phases upon rapid cooling, with reduced extent of the heat-affected zone below 0.4 mm.
Fabrizia Caiazzo. Additive manufacturing by means of laser-aided directed metal deposition of titanium wire. The International Journal of Advanced Manufacturing Technology 2018, 96, 2699 -2707.
AMA StyleFabrizia Caiazzo. Additive manufacturing by means of laser-aided directed metal deposition of titanium wire. The International Journal of Advanced Manufacturing Technology. 2018; 96 (5-8):2699-2707.
Chicago/Turabian StyleFabrizia Caiazzo. 2018. "Additive manufacturing by means of laser-aided directed metal deposition of titanium wire." The International Journal of Advanced Manufacturing Technology 96, no. 5-8: 2699-2707.
The aim of this research activity was to study the fatigue behavior of laser welded joints of titanium alloy, in which the welding was performed using a laser source and in the absence of filler material, by means of unconventional full field techniques: Digital Image Correlation (DIC), and Infrared Thermography (IRT). The DIC technique allowed evaluating the strain gradients around the welded zone. The IRT technique allowed analyzing the thermal evolution of the welded surface during all the fatigue tests. The fatigue limit estimated using the Thermographic Method corresponds with good approximation to the value obtained from the experimental fatigue tests. The obtained results provided useful information for the development of methods and models to predict the fatigue behavior of welded T-joints in titanium allo
Pasqualino Corigliano; Vincenzo Crupi; Eugenio Guglielmino; Carmine Maletta; Emanuele Sgambitterra; Giuseppe Barbieri; Fabrizia Caiazzo. Fatigue assessment of Ti-6Al-4V titanium alloy laser welded joints in absence of filler material by means of full-field techniques. Frattura ed Integrità Strutturale 2017, 12, 171 -181.
AMA StylePasqualino Corigliano, Vincenzo Crupi, Eugenio Guglielmino, Carmine Maletta, Emanuele Sgambitterra, Giuseppe Barbieri, Fabrizia Caiazzo. Fatigue assessment of Ti-6Al-4V titanium alloy laser welded joints in absence of filler material by means of full-field techniques. Frattura ed Integrità Strutturale. 2017; 12 (43):171-181.
Chicago/Turabian StylePasqualino Corigliano; Vincenzo Crupi; Eugenio Guglielmino; Carmine Maletta; Emanuele Sgambitterra; Giuseppe Barbieri; Fabrizia Caiazzo. 2017. "Fatigue assessment of Ti-6Al-4V titanium alloy laser welded joints in absence of filler material by means of full-field techniques." Frattura ed Integrità Strutturale 12, no. 43: 171-181.
Possible anisotropy resulting from Additive Manufacturing of metals is investigated. Superalloy Inconel 718 is considered and a number of specimens are manufactured by means of Selective Laser Melting, with different direction of growing. Tensile testing both at room and elevated temperature are conducted.
Fabrizia Caiazzo; Vittorio Alfieri; Gaetano Corrado; Paolo Argenio. Mechanical properties of Inconel 718 in additive manufacturing via selective laser melting: An investigation on possible anisotropy of tensile strength. 2017 IEEE 3rd International Forum on Research and Technologies for Society and Industry (RTSI) 2017, 1 -4.
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Gaetano Corrado, Paolo Argenio. Mechanical properties of Inconel 718 in additive manufacturing via selective laser melting: An investigation on possible anisotropy of tensile strength. 2017 IEEE 3rd International Forum on Research and Technologies for Society and Industry (RTSI). 2017; ():1-4.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Gaetano Corrado; Paolo Argenio. 2017. "Mechanical properties of Inconel 718 in additive manufacturing via selective laser melting: An investigation on possible anisotropy of tensile strength." 2017 IEEE 3rd International Forum on Research and Technologies for Society and Industry (RTSI) , no. : 1-4.
Directed metal deposition by means of laser beam is investigated in this article. The process is receiving increasingly interest in the frame of additive manufacturing to the purpose of maintenance, repair and overhaul of condemned products when severe conditions hindering the working order have been experienced. Minimal distortion, reduced heat-affected zones and better surface quality are benefited in comparison with conventional techniques. Namely, metal feeding of 2024 aluminium powder is considered to produce clad traces on 2024 aluminium plates, aiming to give grounds for repairing damaged real components using materials with same or similar features with respect to the parent metal. A fibre-delivered disc laser and a three-way feeding nozzle are used. The responses are discussed in terms of geometry, microstructure and microhardness both in the fusion zone and in the heat-affected zone; the optimization is conducted via desirability functions, based on proper technical constraints upon numerical modelling. Reparation of real parts, where cracks are machined to produce V-grooves to be filled, is aimed.
Fabrizia Caiazzo; Vittorio Alfieri; Paolo Argenio; Vincenzo Sergi. Additive manufacturing by means of laser-aided directed metal deposition of 2024 aluminium powder: Investigation and optimization. Advances in Mechanical Engineering 2017, 9, 1 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Paolo Argenio, Vincenzo Sergi. Additive manufacturing by means of laser-aided directed metal deposition of 2024 aluminium powder: Investigation and optimization. Advances in Mechanical Engineering. 2017; 9 (8):1.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Paolo Argenio; Vincenzo Sergi. 2017. "Additive manufacturing by means of laser-aided directed metal deposition of 2024 aluminium powder: Investigation and optimization." Advances in Mechanical Engineering 9, no. 8: 1.
In the frame of additive manufacturing of metals, laser powder-bed fusion is investigated in this paper as an advanced industrial prototyping tool to manufacture Inconel 718 turbine blades at a predesign stage before flow production. Expediting of the evaluation of any upgrade to the part is aimed. To this purpose, possible anisotropy of manufacturing is preliminarily investigated via tensile testing at room and elevated temperature as a function of the sloping angle with the building plate; the normalized strength is given and compared with similar studies in the literature. Positioning and proper supporting in manufacturing are discussed; the parts are further investigated to assess their compliance with the intended nominal geometry.
Fabrizia Caiazzo; Vittorio Alfieri; Gaetano Corrado; Paolo Argenio. Laser powder-bed fusion of Inconel 718 to manufacture turbine blades. The International Journal of Advanced Manufacturing Technology 2017, 93, 4023 -4031.
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Gaetano Corrado, Paolo Argenio. Laser powder-bed fusion of Inconel 718 to manufacture turbine blades. The International Journal of Advanced Manufacturing Technology. 2017; 93 (9):4023-4031.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Gaetano Corrado; Paolo Argenio. 2017. "Laser powder-bed fusion of Inconel 718 to manufacture turbine blades." The International Journal of Advanced Manufacturing Technology 93, no. 9: 4023-4031.
Titanium and its alloys are increasingly being used in aerospace, although a number of issues must be addressed. Namely, in the framework of welding to produce complex parts, the same mechanical strength and a reduced buy-to-fly ratio are desired in comparison with the same components resulting from machining. To give grounds to actual application of autogenous laser beam welding, Ti–6Al–4V L- and T-joints have been investigated in this paper, as they are a common occurrence in general complex components. Discussions in terms of possible imperfections, microstructure, and microhardness have been conducted. Then, a real part consisting of a support flange for aerospace application has been chosen as a valuable test-article to be compared with its machined counterpart both in terms of strength and buy-to-fly. The feasibility and the effectiveness of the process are shown.
Fabrizia Caiazzo; Vittorio Alfieri; Gaetano Corrado; Paolo Argenio; Giuseppe Barbieri; Francesco Acerra; Vincenzo Innaro. Laser Beam Welding of a Ti–6Al–4V Support Flange for Buy-to-Fly Reduction. Metals 2017, 7, 183 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Gaetano Corrado, Paolo Argenio, Giuseppe Barbieri, Francesco Acerra, Vincenzo Innaro. Laser Beam Welding of a Ti–6Al–4V Support Flange for Buy-to-Fly Reduction. Metals. 2017; 7 (5):183.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Gaetano Corrado; Paolo Argenio; Giuseppe Barbieri; Francesco Acerra; Vincenzo Innaro. 2017. "Laser Beam Welding of a Ti–6Al–4V Support Flange for Buy-to-Fly Reduction." Metals 7, no. 5: 183.
The growing interest from the industry for lightweight metal components has driven the development of processes that would allow creating lightweight high melting point metals as steels, able to guarantee mechanical characteristics superior to existing foam (typically aluminium), without penalizing one of the characteristics that cell structures have: lightness. Conventional manufacturing methods, such as casting, however, face difficulty in making complex periodic steel structures with designed shape and size and volume fraction. This study evaluates the manufacturability and performance of lightweight 17–4 PH steel components with spherical porosity fabricated via selective laser melting (SLM). Samples were designed and fabricated with the purpose to produce a structure similar to foam. Built samples were characterized in terms of dimensional accuracy, mechanical strength under compression and energy absorbed per unit mass. The designed structures have a designed relative density or volume fraction ranging between 31.1 and 32.8%.
Fabrizia Caiazzo; Sabina Luisa Campanelli; Francesco Cardaropoli; Nicola Contuzzi; Vincenzo Sergi; Antonio Domenico Ludovico. Manufacturing and characterization of similar to foam steel components processed through selective laser melting. The International Journal of Advanced Manufacturing Technology 2017, 92, 26 -2130.
AMA StyleFabrizia Caiazzo, Sabina Luisa Campanelli, Francesco Cardaropoli, Nicola Contuzzi, Vincenzo Sergi, Antonio Domenico Ludovico. Manufacturing and characterization of similar to foam steel components processed through selective laser melting. The International Journal of Advanced Manufacturing Technology. 2017; 92 (5-8):26-2130.
Chicago/Turabian StyleFabrizia Caiazzo; Sabina Luisa Campanelli; Francesco Cardaropoli; Nicola Contuzzi; Vincenzo Sergi; Antonio Domenico Ludovico. 2017. "Manufacturing and characterization of similar to foam steel components processed through selective laser melting." The International Journal of Advanced Manufacturing Technology 92, no. 5-8: 26-2130.
The article deals with laser beam welding of Ti-6Al-4V plates for aerospace applications. A number of trials are conducted to weld 3-mm-thick plates in corner joint configuration; a specific device for clamping and shielding to prevent oxidation is used. Autogenous welding is investigated, the joint being accessed from the outside, as a butt-welded corner joint. Referring to international standards, the results are first discussed in terms of geometry of the welding bead in the cross-section since titanium alloys are reported to be notch sensitive. Moreover, microstructure and microhardness are investigated. An optimum processing condition is suggested in order to perform laser beam welding with minimal undercut and porosity.
Fabrizia Caiazzo; Vittorio Alfieri; Antonello Astarita; Antonino Squillace; Giuseppe Barbieri. Investigation on laser welding of Ti-6Al-4V plates in corner joint. Advances in Mechanical Engineering 2017, 9, 1 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Antonello Astarita, Antonino Squillace, Giuseppe Barbieri. Investigation on laser welding of Ti-6Al-4V plates in corner joint. Advances in Mechanical Engineering. 2017; 9 (1):1.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Antonello Astarita; Antonino Squillace; Giuseppe Barbieri. 2017. "Investigation on laser welding of Ti-6Al-4V plates in corner joint." Advances in Mechanical Engineering 9, no. 1: 1.