Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Microstructural Evolution and Mechanical Properties of Ti-6Al-4V Alloy through Selective Laser Melting: Comprehensive Study on the Effect of Hot Isostatic Pressing (HIP)

  • Gargi Roy (Department of Materials Science & Engineering, Hanbat National University) ;
  • Raj Narayan Hajra (Department of Materials Science & Engineering, Hanbat National University) ;
  • Woo Hyeok Kim (Department of Materials Science & Engineering, Hanbat National University) ;
  • Jongwon Lee (Department of Materials Science & Engineering, Hanbat National University) ;
  • Sangwoo Kim (Department of Materials Processing, Korea Institute of Materials Science) ;
  • Jeoung Han Kim (Department of Materials Science & Engineering, Hanbat National University)
  • Received : 2023.12.08
  • Accepted : 2024.01.19
  • Published : 2024.02.28
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Abstract

This study explores the profound impact of varying oxygen content on microstructural and mechanical properties in specimens HO and LO. The higher oxygen concentration in specimen HO is found to significantly influence alpha lath sizes, resulting in a size of 0.5-1 ㎛, contrasting with the 1-1.5 ㎛ size observed in specimen LO. Pore fraction, governed by oxygen concentration, is high in specimen HO, registering a value of 0.11%, whereas specimen LO exhibits a lower pore fraction (0.02%). Varied pore types in each specimen further underscore the role of oxygen concentration in shaping microstructural morphology. Despite these microstructural variations, the average hardness remains consistent at ~370 HV. This study emphasizes the pivotal role of oxygen content in influencing microstructural features, contributing to a comprehensive understanding of the intricate interplay between elemental composition and material properties.

Keywords

Acknowledgement

This work was supported by the Fundamental Research Program of the Korea Institute of Materials Science (PNK9260, KIMS). This work was also supported by the Technology Innovation Program [grant number 20016092], Development of Ti-6Al-4V alloy plate with 100 mm thickness by rolling process satisfying aerospace material specification, funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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