This page has only limited features, please log in for full access.
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.
To pursue all the benefits of additive manufacturing of metals, recent studies have been aimed at assessing a proper welding technology to obtain large products by means of joining smaller parts. Indeed, at present, two or more parts must be manufactured individually and then assembled to produce the final component, when the size is incompatible with the building chamber or severe deformations arise during building. In this paper, laser beam welding is explored to join stainless steel components made by the process of laser powder bed fusion, in order to benefit from all the known advantages of this joining technique, aiming at producing a welding bead with homogeneous mechanical features with respect to the unwelded counterpart: a factorial plan is built, and the response surfaces are presented; then, the consolidated method of the desirability function is used to find the optimum condition of welding with reference to the current international standards, taking into account the geometry, the welding imperfections, and the extent of the heat-affected zone. The suggested optimum is eventually assessed via tensile testing and compared to the unwelded sample.
Fabrizia Caiazzo; Vittorio Alfieri. Optimization of laser beam welding of steel parts made by additive manufacturing. The International Journal of Advanced Manufacturing Technology 2021, 114, 3123 -3136.
AMA StyleFabrizia Caiazzo, Vittorio Alfieri. Optimization of laser beam welding of steel parts made by additive manufacturing. The International Journal of Advanced Manufacturing Technology. 2021; 114 (9-10):3123-3136.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri. 2021. "Optimization of laser beam welding of steel parts made by additive manufacturing." The International Journal of Advanced Manufacturing Technology 114, no. 9-10: 3123-3136.
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.
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.
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.
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 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.
Optimization of processing parameters and exposure strategies is usually performed in additive manufacturing to set up the process; nevertheless, standards for roughness may not be evenly matched on a single complex part, since surface features depend on the building direction of the part. This paper aims to evaluate post processing treating via laser surface modification by means of scanning optics and beam wobbling to process metal parts resulting from selective laser melting of stainless steel in order to improve surface topography. The results are discussed in terms of roughness, geometry of the fusion zone in the cross-section, microstructural modification, and microhardness so as to assess the effects of laser post processing. The benefits of beam wobbling over linear scanning processing are shown, as heat effects in the base metal are proven to be lower.
Vittorio Alfieri; Paolo Argenio; Fabrizia Caiazzo; Vincenzo Sergi. Reduction of Surface Roughness by Means of Laser Processing over Additive Manufacturing Metal Parts. Materials 2016, 10, 30 .
AMA StyleVittorio Alfieri, Paolo Argenio, Fabrizia Caiazzo, Vincenzo Sergi. Reduction of Surface Roughness by Means of Laser Processing over Additive Manufacturing Metal Parts. Materials. 2016; 10 (1):30.
Chicago/Turabian StyleVittorio Alfieri; Paolo Argenio; Fabrizia Caiazzo; Vincenzo Sergi. 2016. "Reduction of Surface Roughness by Means of Laser Processing over Additive Manufacturing Metal Parts." Materials 10, no. 1: 30.
An increasing degree of automation is required both in the automotive and aircraft industry in order to allow scrap reduction and flexibility. In this frame, the shift from arc welding to laser beam welding is being investigated for a number of applications on metals in aerospace engineering, where strict standards apply. In comparison with conventional welding methods, a number of advantages are benefited; nevertheless, when moving to a new technology, some issues must be addressed. Hence this study is aimed to investigate laser dissimilar welding of real metal components, in order to assess the technical feasibility as well as to discuss set-up and operating issues in view of the implementation of the process for actual industrial application.A second-stage stator of low-pressure turbine is considered: lightening of the airfoils of the nozzle guide vane is achieved thanks to inner hollows which are drained from wax upon casting; afterward, the core exits on the outer side of the nozzle must be conveniently closed off by means of metal plates. Joining of the plates to the nozzle is performed by fusion welding along the edge of each plate and a condition of dissimilar welding is in place, being the nozzle and the plates made of C1023 and Nimonic 75, respectively.A mixed factorial plan has been arranged, laser power, welding speed and focus position being the leading processing parameters; a convenient welding set-up is proposed. Reasons are given for the implementation of laser beam welding as an alternative to conventional arc welding.
Fabrizia Caiazzo; Vittorio Alfieri; Vincenzo Sergi; Andrea Tartaglia; Michele Di Foggia; Antonio Niola. Technical Feasibility of Laser Dissimilar Welding of Superalloys on Casted Nozzle Guide Vanes. Procedia CIRP 2016, 41, 963 -968.
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Vincenzo Sergi, Andrea Tartaglia, Michele Di Foggia, Antonio Niola. Technical Feasibility of Laser Dissimilar Welding of Superalloys on Casted Nozzle Guide Vanes. Procedia CIRP. 2016; 41 ():963-968.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Vincenzo Sergi; Andrea Tartaglia; Michele Di Foggia; Antonio Niola. 2016. "Technical Feasibility of Laser Dissimilar Welding of Superalloys on Casted Nozzle Guide Vanes." Procedia CIRP 41, no. : 963-968.
Manufacturing industries aim for high quality production with decreased cost and time. To this purpose, optimization of the processing parameters is required, in order to reduce the machining time and match the quality standards. This study has been conducted to electrical discharge machining on Renè 108 DS. In the process, the electrode material is crucial for metal removal and tool wear, whose optimization usually leads to conflicting goals. Therefore, two electrode materials, graphite (Poco EDM-3) and copper-infiltrated-graphite (Poco EDM-C3) have been tested in a factorial plan including current, voltage, duty cycle and electrode polarity. The process is discussed in terms of material removal rate, tool wear rate, wear ratio and final surface roughness of the work-piece
Fabrizia Caiazzo; Luigi Cuccaro; Ilaria Fierro; Giuseppe Petrone; Vittorio Alfieri. Electrical Discharge Machining of René 108 DS Nickel Superalloy for Aerospace Turbine Blades. Procedia CIRP 2015, 33, 382 -387.
AMA StyleFabrizia Caiazzo, Luigi Cuccaro, Ilaria Fierro, Giuseppe Petrone, Vittorio Alfieri. Electrical Discharge Machining of René 108 DS Nickel Superalloy for Aerospace Turbine Blades. Procedia CIRP. 2015; 33 ():382-387.
Chicago/Turabian StyleFabrizia Caiazzo; Luigi Cuccaro; Ilaria Fierro; Giuseppe Petrone; Vittorio Alfieri. 2015. "Electrical Discharge Machining of René 108 DS Nickel Superalloy for Aerospace Turbine Blades." Procedia CIRP 33, no. : 382-387.
Ti-6Al-4V joints are employed in nuclear engineering, civil industry, military, and space vehicles. Laser beam welding has been proven to be promising, thanks to increased penetration depth and reduction of possible defects of the welding bead; moreover, a smaller grain size in the fusion zone is better in comparison to either TIG or plasma arc welding, thus providing an increase in tensile strength of any welded structures. In this frame, the regression models for a number of crucial responses are discussed in this paper. The study has been conducted on 1 mm thick Ti-6Al-4V plates in square butt welding configuration; a disk-laser source has been used. A three-level Box-Behnken experimental design is considered. An optimum condition is then suggested via numerical optimization with the response surface method using desirability functions with proper weights and importance of constraints. Eventually, Vickers microhardness testing has been conducted to discuss structural changes in fusion and heat affected zone due to welding thermal cycles.
Fabrizia Caiazzo; Vittorio Alfieri; Ilaria Fierro; Vincenzo Sergi. Investigation and Optimization of Disk-Laser Welding of 1 mm Thick Ti-6Al-4V Titanium Alloy Sheets. Advances in Mechanical Engineering 2014, 7, 1 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Ilaria Fierro, Vincenzo Sergi. Investigation and Optimization of Disk-Laser Welding of 1 mm Thick Ti-6Al-4V Titanium Alloy Sheets. Advances in Mechanical Engineering. 2014; 7 (2):1.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Ilaria Fierro; Vincenzo Sergi. 2014. "Investigation and Optimization of Disk-Laser Welding of 1 mm Thick Ti-6Al-4V Titanium Alloy Sheets." Advances in Mechanical Engineering 7, no. 2: 1.
Welded Ti-6Al-4V joints are employed in nuclear engineering, civil industries, military and space vehicles. Laser beam welding has been used for welding thanks to its advantages in terms of increase in penetration depth and reduction of possible defects; moreover a smaller grain size in the fused zone is benefited in comparison to either TIG and plasma arc welding, thus providing an increase in the tensile strength of the welded structures. The aim of this work is to develop and test the regression model for a number of crucial responses. The study has been carried out on 1 mm thick Ti-6Al-4V plates; a square butt welding configuration was considered employing a disk-laser source. A three level Box-Behnken experimental design is considered. An optimum condition has been suggested via numerical optimization of the desirability function with proper weights and importance of constraints. Vickers micro hardness testing was conducted to discuss structural changes in fused and heat affected zone.
Fabrizia Caiazzo; Vittorio Alfieri; Ilaria Fierro; Vincenzo Sergi. Investigation and Optimization of Disk-Laser Welding of 1 MM Thick Ti-6Al-4V Titanium Alloy Sheets. Volume 2: Processing 2014, 1 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Ilaria Fierro, Vincenzo Sergi. Investigation and Optimization of Disk-Laser Welding of 1 MM Thick Ti-6Al-4V Titanium Alloy Sheets. Volume 2: Processing. 2014; ():1.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Ilaria Fierro; Vincenzo Sergi. 2014. "Investigation and Optimization of Disk-Laser Welding of 1 MM Thick Ti-6Al-4V Titanium Alloy Sheets." Volume 2: Processing , no. : 1.
Titanium alloys are employed in a wide range of applications, from aerospace to medicine. In particular, Ti-6Al-4 V is the most common, thanks to an excellent combination of low density, high specific strength, and corrosion resistance. Laser welding has been increasingly considered as an alternative to traditional techniques to join titanium alloys. An increase in penetration depth and a reduction of possible welding defects are indeed achieved; moreover, a smaller grain size in the fused zone (FZ) is benefited in comparison to either tungsten inert gas (TIG) or plasma arc welding, thus improving the tensile strength of the welded structures. This study was carried out on 3 mm thick Ti-6Al-4 V plates in square butt welding configuration. The novelty element of the investigation is the use of a disk-laser source, which allows a number of benefits thanks to better beam quality; furthermore, a proper device was developed for bead protection, as titanium is prone to oxidation when in fused state. A three-level factorial plan was arranged in face-centered cubic scheme. The regression models were found for a number of crucial responses and the corresponding surfaces were discussed; then a numerical optimization was carried out. The suggested condition was evaluated to compare the actual responses to the predicted values; X-ray inspections, Vickers micro hardness tests, and tensile tests were performed for the optimum.
Fabrizia Caiazzo; Vittorio Alfieri; Gaetano Corrado; Francesco Cardaropoli; Vincenzo Sergi. Investigation and Optimization of Laser Welding of Ti-6Al-4 V Titanium Alloy Plates. Journal of Manufacturing Science and Engineering 2013, 135, 061012 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Gaetano Corrado, Francesco Cardaropoli, Vincenzo Sergi. Investigation and Optimization of Laser Welding of Ti-6Al-4 V Titanium Alloy Plates. Journal of Manufacturing Science and Engineering. 2013; 135 (6):061012.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Gaetano Corrado; Francesco Cardaropoli; Vincenzo Sergi. 2013. "Investigation and Optimization of Laser Welding of Ti-6Al-4 V Titanium Alloy Plates." Journal of Manufacturing Science and Engineering 135, no. 6: 061012.
Titanium alloys are employed for several applications, ranging from aerospace to medicine. In particular, Ti-6Al-4V is the most common, thanks to an excellent combination of low density, high specific strength and corrosion resistance. Laser welding has been increasingly considered as an alternative to traditional techniques to join titanium alloys. An increase in penetration depth and a reduction of possible welding defects is achieved indeed; moreover a smaller grain size in the fused zone is benefited in comparison to either TIG and plasma arc welding, thus providing an increase in the tensile strength of the welded structures. The aim of this work is to develop the regression model for a number of responses which are crucial for the feature of the joint. The study was carried out on 3 mm thick Ti-6Al-4V plates; a square butt welding configuration was considered employing a disk-laser source. A 3-level factorial plan was hence arranged in a face-centred cubic scheme. The responses were analyzed referring to the governing parameters. Then, an optimization was carried out via statistical tools, in order to find the optimal welding set-up for the alloy under examination.
Fabrizia Caiazzo; Vittorio Alfieri; Gaetano Corrado; Francesco Cardaropoli; Vincenzo Sergi. Investigation and Optimization of Laser Welding of Ti-6Al-4V Titanium Alloy Plates. Volume 2: Systems; Micro and Nano Technologies; Sustainable Manufacturing 2013, 1 .
AMA StyleFabrizia Caiazzo, Vittorio Alfieri, Gaetano Corrado, Francesco Cardaropoli, Vincenzo Sergi. Investigation and Optimization of Laser Welding of Ti-6Al-4V Titanium Alloy Plates. Volume 2: Systems; Micro and Nano Technologies; Sustainable Manufacturing. 2013; ():1.
Chicago/Turabian StyleFabrizia Caiazzo; Vittorio Alfieri; Gaetano Corrado; Francesco Cardaropoli; Vincenzo Sergi. 2013. "Investigation and Optimization of Laser Welding of Ti-6Al-4V Titanium Alloy Plates." Volume 2: Systems; Micro and Nano Technologies; Sustainable Manufacturing , no. : 1.