International Journal of Precision Engineering and Manufacturing-Green Technology

Korean Society for Precision Engineering (한국정밀공학회)
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Microstructure-Properties Relationships of Ti-6Al-4V Parts Fabricated by Selective Laser Melting

  • Mezzetta, Justin (Department of Mining and Materials Engineering, McGill University) ;
  • Choi, Joon-Phil (Department of Mining and Materials Engineering, McGill University) ;
  • Milligan, Jason (Department of Mining and Materials Engineering, McGill University) ;
  • Danovitch, Jason (Department of Mining and Materials Engineering, McGill University) ;
  • Chekir, Nejib (Department of Mining and Materials Engineering, McGill University) ;
  • Bois-Brochu, Alexandre (Recherche et Developpement, Centre de metallurgie du Quebec (CMQ)) ;
  • Zhao, Yaoyao Fiona (Department of Mechanical Engineering, McGill University) ;
  • Brochu, Mathieu (Department of Mining and Materials Engineering, McGill University)
  • Received : 2017.04.04
  • Accepted : 2017.05.29
  • Published : 2018.10.01
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Abstract

This work investigates the relationships between the static mechanical properties of Ti-6Al-4V manufactured through selective laser melting (SLM) and post-process heat treatments, namely stress relieve, annealing and hot isostatic pressing (HIP). In particular, Ti-6Al-4V parts were fabricated in three different build orientations of X, Z, and $45^{\circ}$ to investigate the multi-directional mechanical properties. The results showed that fully densified Ti-6Al-4V parts with densities of up to 99.5% were obtained with optimized SLM parameters. The microstructure of stress relieved and mill annealed samples was dominated by fine ${\alpha}^{\prime}$ martensitic needles. After HIP treatment, the martensite structure was fully transformed into ${\alpha}$ and ${\beta}$ phases (${\alpha}+{\beta}$ lamellar). Within the realm of tensile properties, the yield and ultimate strength values were found statistically similar with respect to the built orientation for a given heat treatment. However, the ductility was found orientation dependent for the HIP samples, where a lower value was observed for samples built in the X direction.

Keywords

References

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