Deformation and failure mechanisms of Ti–6Al–4V as built by selective laser melting

Moridi, Atieh; Demir, Ali Gökhan; Caprio, Leonardo; Hart, A. John; Previtali, Barbara; Colosimo, Bianca Maria

doi:10.1016/j.msea.2019.138456

Cited by 104 publications

(21 citation statements)

References 43 publications

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“…In the case of titanium alloys (especially Ti-6Al-4V alloy), SLM technology seems to be the most often described in the technical publications among AM methods [17][18][19]23,[68][69][70][71][72][73]. According to their authors, the martensite formation and decomposition belong to the main factors determining mechanical properties of SLM-produced Ti-6Al-4V alloy.…”

Section: Pbf Methodsmentioning

confidence: 99%

Martensite Formation and Decomposition during Traditional and AM Processing of Two-Phase Titanium Alloys—An Overview

Motyka

2021

Metals

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Titanium alloys have been considered as unique materials for many years. Even their microstructure and operational properties have been well known and described in details, the new technologies introduced—e.g., 3D printing—have restored the need for further research in this area. It is understood that martensitic transformation is usually applied in heat treatment of hardenable alloys (e.g., Fe alloys), but in the case of titanium alloys, it also occurs during the thermomechanical processing or advanced additive manufacturing. The paper summarizes previous knowledge on martensite formation and decomposition processes in two-phase titanium alloys. It emphasizes their important role in microstructure development during conventional and modern industrial processing.

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Section: Pbf Methodsmentioning

confidence: 99%

Martensite Formation and Decomposition during Traditional and AM Processing of Two-Phase Titanium Alloys—An Overview

Motyka

2021

Metals

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“…Indeed it is usually reported to be a hard and brittle phase when formed from the b-phase field in Ti-6Al-4V alloy [13][14]. As referred in [3] [7][9] [15][16], the V content of the β phase significantly increases and the Al content decreases when the annealing temperature in the a+b phase field decreases.…”

Section: Introductionmentioning

confidence: 99%

Crystallography and reorientation mechanism upon deformation in the martensite of an α-α’ Ti-6Al-4V dual-phase microstructure exhibiting high work-hardening rate

et al. 2021

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“…In cold spraying, powders are accelerated by a supersonic jet of compressed gas through a de Laval nozzle [15]. This is unlike other additive manufacturing processes, where powders are either laid down on a powder bed as is done in selective laser melting (SLM) and selective electron beam melting (SEBM) [17,18] or fed by a powder feeder at velocities up to 10 mm/s as is done in directed energy deposition (DED) [19][20][21]. Some Ti-6Al-4V porous structures have been fabricated by additive techniques such as SLM [22], SEBM [23][24][25], DED [26], and binderjet [27].…”

Section: Introductionmentioning

confidence: 99%

Solid-state additive manufacturing of porous Ti-6Al-4V by supersonic impact

Moridi

Stewart

Wakai

et al. 2020

Applied Materials Today

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Additive manufacturing of functional metallic parts based on layer-by-layer melting and solidification suffers from the detrimental effects of high-temperature processing such as large residual stresses, poor mechanical properties, unwanted phase transformations, and part distortion. Here we utilize the kinetic energy of powder particles to form solid-state bonding and overcome the challenges associated with the high temperature processing of metals. Specifically, we accelerated powders to supersonic impact velocities (~600 m/s) and exploited plastic deformation and softening due to high strain rate dynamic loading to 3D print Ti-6Al-4V powders at temperatures (800 °C, 900 °C) well below their melting point (1626 °C). By using processing conditions below the critical powder impact velocity and controlling the surface temperature, we created mechanically robust, porous metallic deposits with spatially controlled porosity (apparent modulus 51.7±3.2 GPa, apparent compressive yield strength 535±35, porosity 30±2%). When the mechanical properties of solid-state 3D printed Ti-6Al-4V were compared to other additive manufactured techniques, the Young's modulus was similar, but the compressive yield strength was up to 42% higher. Post heat treatment of solid-state printed porous Ti-6Al-4V modified the mechanical behavior of the deposit under compressive loading. Additionally, the 3D printed porous Ti-6Al-4V was shown to be biocompatible with MC3T3-E1 SC4 murine preosteoblast cells, indicating the potential biomedical applications of these materials. Our study demonstrates a single-step, solid-state additive manufacturing method for producing biocompatible porous metal parts with higher strength than conventional high temperature additive manufacturing techniques.

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Deformation and failure mechanisms of Ti–6Al–4V as built by selective laser melting

Cited by 104 publications

References 43 publications

Martensite Formation and Decomposition during Traditional and AM Processing of Two-Phase Titanium Alloys—An Overview

Martensite Formation and Decomposition during Traditional and AM Processing of Two-Phase Titanium Alloys—An Overview

Crystallography and reorientation mechanism upon deformation in the martensite of an α-α’ Ti-6Al-4V dual-phase microstructure exhibiting high work-hardening rate

Solid-state additive manufacturing of porous Ti-6Al-4V by supersonic impact

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