한국재료학회지 (Korean Journal of Materials Research)

  • 제16권5호
  • /
  • Pages.318-322
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  • 2006
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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Hastelloy X의 고온열화에 따른 미세구조 및 고온압축특성

Microstructural Analysis and High Temperature Compression Behavior of High Temperature Degradation on Hastelloy X

  • 김길수 (한양대학교 신소재공학과) ;
  • 조태선 (한양대학교 신소재공학과) ;
  • 서영익 (한양대학교 신소재공학과) ;
  • 류우석 (한국원자력연구소 원자력재료기술개발부) ;
  • 김영도 (한양대학교 신소재공학과)
  • Kim, Gil-Su (Division of Materials Science and Engineering, Hanyang University) ;
  • Jo, Tae-Sun (Division of Materials Science and Engineering, Hanyang University) ;
  • Seo, Young-Ik (Division of Materials Science and Engineering, Hanyang University) ;
  • Ryu, Woo-Seog (Division of Nuclear Materials Technology and Development, Korea Atomic Energy Research Institute) ;
  • Kim, Young-Do (Division of Materials Science and Engineering, Hanyang University)
  • 발행 : 2006.05.27
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초록

Short-term high temperature degradation test was conducted on Hastelloy X, a candidate tube material for high temperature gas-cooled reactors (HTGR), to evaluate the variation of microstructure and mechanical property in air at $1050^{\circ}C$ during 2000 h. The dominant oxide layer was Cr-oxide and a very shallow Cr-depleted region was observed below the oxide layer. At the beginning of degradation, the island shape $M_6C$ precipitate (M=Mo-rich, Fe, Ni, Cr) was observed in matrix region. After 2000 h degradation, precipitate shape was changed to the chain shape and increased amount of precipitate. These results influenced mechanical property of the specimen which exposed in high temperature. Yield strength was decreased from 115MPa to 89 MPa after 24 h and 2000 h exposure, respectively.

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