Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Cryogenic Tensile Behavior of Ferrous Medium-entropy Alloy Additively Manufactured by Laser Powder Bed Fusion

  • Seungyeon Lee (Department of 3D Printing Materials, Korea Institute of Materials Science (KIMS)) ;
  • Kyung Tae Kim (Department of 3D Printing Materials, Korea Institute of Materials Science (KIMS)) ;
  • Ji-Hun Yu (Department of 3D Printing Materials, Korea Institute of Materials Science (KIMS)) ;
  • Hyoung Seop Kim (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Jae Wung Bae (Department of Metallurgical Engineering, Pukyong National University) ;
  • Jeong Min Park (Department of 3D Printing Materials, Korea Institute of Materials Science (KIMS))
  • Received : 2023.12.11
  • Accepted : 2024.02.03
  • Published : 2024.02.28
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Abstract

The emergence of ferrous-medium entropy alloys (FeMEAs) with excellent tensile properties represents a potential direction for designing alloys based on metastable engineering. In this study, an FeMEA is successfully fabricated using laser powder bed fusion (LPBF), a metal additive manufacturing technology. Tensile tests are conducted on the LPBF-processed FeMEA at room temperature and cryogenic temperatures (77 K). At 77 K, the LPBF-processed FeMEA exhibits high yield strength and excellent ultimate tensile strength through active deformation-induced martensitic transformation. Furthermore, due to the low stability of the face-centered cubic (FCC) phase of the LPBF-processed FeMEA based on nano-scale solute heterogeneity, stress-induced martensitic transformation occurs, accompanied by the appearance of a yield point phenomenon during cryogenic tensile deformation. This study elucidates the origin of the yield point phenomenon and deformation behavior of the FeMEA at 77 K.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT of Korea (2021R1A2C3006662, 2022R1A5A1030054). This work was also supported by Principal R&D Project (PNK8960) of the Korean Institute of Materials Science (KIMS), and Basic Research Program (PICO960) of Korea Institute of Machinery and Materials (KIMM).

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