Crystallographic features of α variants and β phase for Ti-6Al-4V alloy fabricated by selective laser melting

Yang, Yugui; Liu, Yujing; Chen, J.; Wang, H.L.; Zhang, Z.Q.; Lu, Yanjin; Wu, Songquan; Lin, Jun

doi:10.1016/j.msea.2017.09.068

Cited by 66 publications

(20 citation statements)

References 46 publications

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“…The various cooling rates shown in this figure were extracted from the furnace heat treatment profile. Cooling rates affect the growth of α-lathes for temperatures just below and any temperature above the beta transus temperature (980 °C) [ 25 ], including formation of martensitic microstructure during very rapid cooling. However, cooling rates have been shown to have minimal effects on the growth of α-grains for temperatures near and below the martensitic transformation (Ms) temperature (780 °C) [ 26 ].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Dislocation Densities in Various Microstructures of Additively Manufactured Ti6Al4V (Eli) by the Method of X-ray Diffraction

2020

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Dislocations play a central role in determining strength and flow properties of metals and alloys. Diffusionless phase transformation of β→α in Ti6Al4V during the Direct Metal Laser Sintering (DMLS) process produces martensitic microstructures with high dislocation densities. However, heat treatment, such as stress relieving and annealing, can be applied to reduce the volume of these dislocations. In the present study, an analysis of the X-ray diffraction (XRD) profiles of the non-heat-treated and heat-treated microstructures of DMLS Ti6Al4V(ELI) was carried out to determine the level of defects in these microstructures. The modified Williamson–Hall and modified Warren–Averbach methods of analysis were used to evaluate the dislocation densities in these microstructures. The results obtained showed a 73% reduction of dislocation density in DMLS Ti6Al4V(ELI) upon stress relieving heat treatment. The density of dislocations further declined in microstructures that were annealed at elevated temperatures, with the microstructures that were heat-treated just below the β→α recording the lowest dislocation densities.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Dislocation Densities in Various Microstructures of Additively Manufactured Ti6Al4V (Eli) by the Method of X-ray Diffraction

2020

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“…8b. 119,143 Additionally, the volume fractions of the β-phase for the commercial and the SLMed Ti6Al4V alloy were about 13.3% and 5.0%, respectively. 132 It is known that the β-phase contains more V content and that the oxide film formed on the β-phase is more stable than that on the α-phase, which plays an important role in improving its corrosion resistance.…”

Section: Special Corrosion Issues Of Several 3d Printed Materialsmentioning

confidence: 97%

Corrosion of metallic materials fabricated by selective laser melting

Kong

2019

npj Mater Degrad

188

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Additive manufacturing is an emerging technology that challenges traditional manufacturing methods. However, the corrosion behaviour of additively manufactured parts must be considered if additive techniques are to find widespread application. In this paper, we review relationships between the unique microstructures and the corresponding corrosion behaviour of several metallic alloys fabricated by selective laser melting, one of the most popular powder-bed additive technologies for metals and alloys. Common issues related to corrosion in selective laser melted parts, such as pores, molten pool boundaries, surface roughness and anisotropy, are discussed. Widely printed alloys, including Ti-based, Al-based and Fe-based alloys, are selected to illustrate these relationships, and the corrosion properties of alloys produced by selective laser melting are summarised and compared to their conventionally processed counterparts.

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“…Additive manufacturing (AM) has been emerging as a technology with the ability to realize three‐dimensional shapes with complex geometries based on the layer‐by‐layer incremental manufacturing concept . Currently, there exist several representative AM techniques, including inkjet printing (IJP), fused deposition modeling (FDM), selective laser sintering (SLS), ultrafast laser processing, selective laser melting (SLM), and electron beam melting (EBM) . So far, many alloys, such as steels, titanium alloys, and aluminum alloys, have been used to fabricate products with excellent properties .…”

Section: Introductionmentioning

confidence: 99%

Additive Manufacturing of Titanium Alloys by Electron Beam Melting: A Review

et al. 2017

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Electron beam melting (EBM), as one of metal additive manufacturing technologies, is considered to be an innovative industrial production technology. Based on the layer-wise manufacturing technique, as-produced parts can be fabricated on a powder bed using the 3D computational design method. Because the melting process takes place in a vacuum environment, EBM technology can produce parts with higher densities compared to selective laser melting (SLM), particularly when titanium alloy is used. The ability to produce higher quality parts using EBM technology is making EBM more competitive. After briefly introducing the EBM process and the processing factors involved, this paper reviews recent progress in the processing, microstructure, and properties of titanium alloys and their composites manufactured by EBM. The paper describes significant positive progress in EBM of all types of titanium in terms of solid bulk and porous structures including Ti-6Al-4V and Ti-24Nb-4Zr-8Sn, with a focus on manufacturing using EBM and the resultant unique microstructure and service properties (mechanical properties, fatigue behaviors, and corrosion resistance properties) of EBM-produced titanium alloys.

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Crystallographic features of α variants and β phase for Ti-6Al-4V alloy fabricated by selective laser melting

Cited by 66 publications

References 46 publications

Evaluation of Dislocation Densities in Various Microstructures of Additively Manufactured Ti6Al4V (Eli) by the Method of X-ray Diffraction

Evaluation of Dislocation Densities in Various Microstructures of Additively Manufactured Ti6Al4V (Eli) by the Method of X-ray Diffraction

Corrosion of metallic materials fabricated by selective laser melting

Additive Manufacturing of Titanium Alloys by Electron Beam Melting: A Review

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