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Effect of Stress Relieving Heat Treatment on the Microstructure and High-Temperature Compressive Deformation Behavior of Ti-6Al-4V Alloy Manufactured by Selective Laser Melting

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Abstract

This study aims to investigate the effect of stress relieving heat treatment on the microstructure and high-temperature compressive deformation behavior of the Ti-6Al-4V alloy, manufactured by selective laser melting. Initial microstructural observation confirmed elongated prior β grains in the building direction of both specimens (as-fabricated and heat-treated specimens). Along with such, the as-fabricated specimen only featured α′-martensite phase, while the heat-treated specimen featured α′-martensite and some α and β phases. Compression tests carried out at room temperature gave yield strengths of 1365 and 1138 MPa for the as-fabricated and heat-treated specimens, respectively. Such values are similar or greater than those of commercial wrought materials. The compressive fracture strain significantly increased after heat treatment. There was a general tendency of reducing yield strength as compressive temperatures increased. At temperatures greater than 700 °C, the as-fabricated and heat-treated specimens achieved similar strength. Microstructural observation after deformation confirmed that the initial microstructure was retained up to temperatures of 500 °C. At 700 °C or greater, both specimens showed drastic microstructural evolution.

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Acknowledgment

This research was supported by the Korean Institute of Materials Science, Korea.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Inha University, Incheon, 22212, Republic of Korea

    Young-Kyun Kim & Kee-Ahn Lee

  2. RIST, Pohang-si, Gyeongbuk, 37673, Republic of Korea

    Soon-Hong Park

  3. KIMS, Changwon-si, Gyeongnam, 51508, Republic of Korea

    Yong-Jin Kim

  4. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA

    Bandar Almangour

Authors
  1. Young-Kyun Kim
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  2. Soon-Hong Park
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  3. Yong-Jin Kim
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Correspondence to Kee-Ahn Lee.

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Manuscript submitted April 10, 2018.

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Kim, YK., Park, SH., Kim, YJ. et al. Effect of Stress Relieving Heat Treatment on the Microstructure and High-Temperature Compressive Deformation Behavior of Ti-6Al-4V Alloy Manufactured by Selective Laser Melting. Metall Mater Trans A 49, 5763–5774 (2018). https://doi.org/10.1007/s11661-018-4864-0

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  • DOI: https://doi.org/10.1007/s11661-018-4864-0

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