Microstructure and Mechanical Properties of Ti–6Al–4V parts build by Selective Laser Melting

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  • Sakurai Yuya
    Department of Mechanical Engineering, Graduate School of Science and Engineering, Tokyo Metropolitan University
  • Kakehi Koji
    Department of Mechanical Engineering, Graduate School of Science and Engineering, Tokyo Metropolitan University

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  • Ti–6Al–4Vレーザー積層材の組織と機械的特性
  • Ti-6Al-4Vレーザー セキソウザイ ノ ソシキ ト キカイテキ トクセイ

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Abstract

<p>Additive manufacturing(AM)is the relatively recent process suitable for small - volume production in great varieties. The microstructure of Ti–6Al–4V melted by selective laser melting(SLM)using laser as a heat source and the relationship between the microstructure and mechanical properties were investigated comparing with electron beam melting(EBM)and conventional mill-annealed specimens. The effects of built direction and heat treatment on the tensile and creep properties of Ti–6Al–4V, fabricated by SLM, were also examined. The compositional image in BSE mode and electron backscatter diffraction(EBSD)analysis revealed SLM and EBM specimens were found to consist of acicular α grain transformed from α′ martensite and very fine β distributed in α/α grain boundary. Prior β boundaries were also observed. α+β equiaxed grains were observed in the conventional mill-annealed specimen. Conventional standard heat treatment(954°C/2 h(WQ)+538°C/4 h(AC))improved tensile and creep strengths in the mill-annealed specimen, however it did not improve the strengths in the SLM specimens so much. The tensile and creep strengths were comparable between the horizontal-direction and the vertical-direction specimens, i.e., SLM specimen showed isotropic mechanical properties.</p>

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