Effect of heat treatment on the phase transformation and mechanical properties of Ti6Al4V fabricated by selective laser melting

Yan, Xingchen; Yin, Shuo; Chen, Chaoyue; Huang, Chao; Bolot, Rodolphe; Lupoi, Rocco; Min, Kyoungwon; Ma, Wanbiao; Coddet, Christian; Liao, Hanlin; Liu, Min

doi:10.1016/j.jallcom.2018.06.076

Cited by 261 publications

(82 citation statements)

References 37 publications

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“…This indicates that these samples contain very low transformed β phase. And the β phase peak intensity is higher for the samples heat-treated at 950 • C. The content of β phase in this heat treatment condition is still low, according to previous research [17]. Figure 8 represents the stress-strain curves of the porous Ti64 structures with different porosities after heat treatment.…”

Section: Morphology Of Porous Ti64 Structuresupporting

confidence: 55%

“…The size of each sample was designed to be 6 × 6 × 12 mm. that the heat treatment would improve the mechanical properties of SLM-built Ti64 parts by removing internal defects and residual stresses [16][17][18][19]. Moreover, the mechanical behavior of porous structures is not only related to its complex topology, but is also related to the microstructure of the material.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Post Heat Treatment on the Microstructural and Mechanical Properties of an Additive-Manufactured Porous Titanium Alloy

Hua

et al. 2020

Materials

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In this work, Ti-6Al-4V (Ti64) porous structures were prepared by selective laser melting (SLM), and the effects of post heat treatment on its microstructural and mechanical properties were investigated. The results showed that as SLM samples were mainly composed of needle-like α′ martensite. Heat treatment at 750 °C caused α′ phase to decompose, forming a lamellar α+β mixed microstructure. As the heat treatment temperature increased to 950 °C, the width of lamellar α phase gradually increased to 3.1 μm. Heat treatment also reduced the compressive strength of the samples; however, it significantly improved the ductility of the porous Ti64. Moreover, heat treatment improved the energy absorption efficiency of the porous Ti64. The samples heat-treated at 750 °C had the highest energy absorption of 233.6 ± 1.5 MJ/m3 at ε = 50%.

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Section: Morphology Of Porous Ti64 Structuresupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

The Effects of Post Heat Treatment on the Microstructural and Mechanical Properties of an Additive-Manufactured Porous Titanium Alloy

Hua

et al. 2020

Materials

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“…In such AM processes, the highenergy sources like laser or electron beam can be used to melt down the powder bed selectively, whereas the resulting solidification can achieve the fabrication. It includes the selective laser melting (SLM) ( Ref 2,3), selective laser sintering (SLS) ( Ref 4) and electron beam melting (EBM) ( Ref 5). However, for such high-energybased methods, the disadvantages like residual stress and unwanted phase transformations due to high processing temperature cannot be avoided.…”

Section: Introductionmentioning

confidence: 99%

Strengthened Peening Effect on Metallurgical Bonding Formation in Cold Spray Additive Manufacturing

et al. 2019

Self Cite

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Cold spraying is a solid-state coating process and promising technique for additive manufacturing. However, questions raise about the bonding mechanism between the particles forming the coating. In this study, the strengthened peening effect is proposed as the determining factor for the formation of metallurgical bonding in cold spray additive manufacturing. Ni coatings and single splats were produced on Al substrates with different propelling gas pressures. Contrary to common understanding, no metallurgical bonding was observed in single-particle impact, even at the pressure of 3.7 MPa. However, the metallurgical bonding was observed at the full coating deposition through the existence of diffusion after heat treatment. Thus, the strengthened peening effect of subsequent particles with successive impact energy might be the determining factor for the formation of metallurgical bonding. Actually, strengthened peening effect significantly improved the coating quality through enhanced metallurgical bonding, which was proved by the increasing adhesion strength and decreasing porosity.

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“…Ti-6Al-4V is a duplex structured alloy which contains a hexagonal close packed (hcp) α phase and a body-centered cubic (bcc) β phase [13,14]. As is shown in previous studies [15][16][17], a wide range of microstructures of Ti-6Al-4V can be exhibited through different heat treatment conditions. By Zhao et al [18] have shown that the original acicular martensite α' in the Ti-6Al-4V alloy is converted into a lamellar mixture structure of α+β for heat treatment temperatures below the critical temperature (T 0 ≈ 893 • C), and a basketweave structure was obtained when the heat treatment temperature is above T 0 .…”

Section: Introductionmentioning

confidence: 79%

Effect of Build Orientation on the Corrosion Behavior and Mechanical Properties of Selective Laser Melted Ti-6Al-4V

Sui¹,

Li²,

Wang³

et al. 2019

Metals

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Ti-6Al-4V alloys with different build orientations have been fabricated by selective laser melting (SLM). The corrosion behavior and mechanical properties have been studied. Investigation of microstructures were characterized by optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis. Electrochemical results show that the vertical sample and horizontal sample possess excellent corrosion resistance in the cross section and longitudinal section respectively, which can be attributed to the presence of less acicular α′ martensite and more β phase. Mechanical properties of all samples were determined by compression testing and hardness measurements. The compression strength (σc) and plastic deformation (εp) of the horizontal sample were higher than those of the vertical sample and the sample with building direction of 45°, because the molten pool boundaries (MPBs) play a significant role in the microscopic slipping at the loading SLM parts. In addition, the sample with building orientation of 45° achieved highest hardness. Therefore, distinct anisotropy due to different build orientations.

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Effect of heat treatment on the phase transformation and mechanical properties of Ti6Al4V fabricated by selective laser melting

Cited by 261 publications

References 37 publications

The Effects of Post Heat Treatment on the Microstructural and Mechanical Properties of an Additive-Manufactured Porous Titanium Alloy

The Effects of Post Heat Treatment on the Microstructural and Mechanical Properties of an Additive-Manufactured Porous Titanium Alloy

Strengthened Peening Effect on Metallurgical Bonding Formation in Cold Spray Additive Manufacturing

Effect of Build Orientation on the Corrosion Behavior and Mechanical Properties of Selective Laser Melted Ti-6Al-4V

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