한국주조공학회지 (Journal of Korea Foundry Society)

  • 제36권5호
  • /
  • Pages.159-166
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  • 2016
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  • 1598-706X(pISSN)
  • /
  • 2288-8381(eISSN)
한국주조공학회 (Korea Foundry Society)
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니켈기 초내열합금의 열간노출에 따른 미세조직 및 기계적 특성 변화

Evolution of Microstructure and Mechanical Properties of a Ni Base Superalloy during Thermal Exposure

  • 김인수 (한국기계연구원 부설 재료연구소 내열재료연구실) ;
  • 최백규 (한국기계연구원 부설 재료연구소 내열재료연구실) ;
  • 정중은 (한국기계연구원 부설 재료연구소 내열재료연구실) ;
  • 도정현 (한국기계연구원 부설 재료연구소 내열재료연구실) ;
  • 정인용 (한국기계연구원 부설 재료연구소 내열재료연구실) ;
  • 조창용 (한국기계연구원 부설 재료연구소 내열재료연구실)
  • Kim, In-Soo (High tmeperature Materials Department, Kora Institute of materials Science) ;
  • Choi, Baig-Gyu (High tmeperature Materials Department, Kora Institute of materials Science) ;
  • Jung, Joong-Eun (High tmeperature Materials Department, Kora Institute of materials Science) ;
  • Do, Jeong-Hyeon (High tmeperature Materials Department, Kora Institute of materials Science) ;
  • Jung, In-Yong (High tmeperature Materials Department, Kora Institute of materials Science) ;
  • Jo, Chang-Yong (High tmeperature Materials Department, Kora Institute of materials Science)
  • 투고 : 2016.09.21
  • 심사 : 2016.10.14
  • 발행 : 2016.10.31
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초록

The microstructural evolution of a cast Ni base superalloy, IN738LC, has been investigated after long term exposure at several temperatures. Most of the fine secondary ${\gamma}^{\prime}$ particles resolved after 2000 hour exposure at $816^{\circ}C$. At higher temperatures of $871^{\circ}C$ and $927^{\circ}C$, secondary ${\gamma}^{\prime}$ resolved after 1000 hours of exposure, and cuboidal primary ${\gamma}^{\prime}$ grew with exposure time. During the thermal exposure, ${\sigma}$ phase formed at all tested temperatures, and ${\eta}$ phase was observed around interdendritic regions due to carbide degeneration. The influence of microstructural evolution during thermal exposure on the mechanical properties has been analyzed. The effects of ${\gamma}^{\prime}$ particle growth are more pronounced on the high temperature creep properties than on the room temperature tensile properties.

키워드

참고문헌

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피인용 문헌

  1. 항공기엔진용 1단계 터빈블레이드에 대한 파손 연구 vol.46, pp.10, 2016, https://doi.org/10.5139/jksas.2018.46.10.806