Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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A Study on Correlation of Microstructural Degradation and Mechanical Properties of 9-12%Cr-Steel for Ultra-Super Critical Power Generation

초초임계압 발전용 소재의 장시간 열처리에 따른 미세조직 변화와 기계적 특성의 상관관계 연구

  • Joo Sungwook (Dept. of Materials Science and Engineering, Changwon) ;
  • Yoo Junghoon (Dept. of Materials Science and Engineering, Changwon) ;
  • Shin Keesam (Dept. of Materials Science and Engineering, Dept. of Metallurgy and Materials Science, Changwon) ;
  • Hur Sung Kang (Dept. of Materials Science and Engineering, Dept. of Metallurgy and Materials Science, Changwon) ;
  • Lee Je-Hyun (Dept. of Materials Science and Engineering, Dept. of Metallurgy and Materials Science, Changwon) ;
  • Suk Jin Ik (Doosan Heavy Industries & Construction Co., LTD.) ;
  • Kim Jeong Tae (Doosan Heavy Industries & Construction Co., LTD.) ;
  • Kim Byung Hoon (Doosan Heavy Industries & Construction Co., LTD.)
  • 주성욱 (창원대학교 재료공학과) ;
  • 유정훈 (창원대학교 재료공학과) ;
  • 신기삼 (창원대학교 재료공학과, 창원대학교 금속재료공학과) ;
  • 허성강 (창원대학교 재료공학과, 창원대학교 금속재료공학과) ;
  • 이재현 (창원대학교 재료공학과, 창원대학교 금속재료공학과) ;
  • 석진익 (두산중공업) ;
  • 김정태 (두산중공업) ;
  • 김병훈 (두산중공업)
  • Published : 2005.01.01
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Abstract

For the good combination of high-temperature strength, toughness and creep property, $9-12\%$ chromium steels are often used for gas turbine compressors, steam turbine rotors, blade and casing. In this study, the correlation of microstructural evolution and mechanical properties was investigated fur the specimens heat-treated at 600, 650 and $700^{\circ}C$ for 1000, 3000 and 5000 hrs. The microstructure of as-received specimen was tempered martensite with a high dislocation density, small sub-grains and fine secondary phase such as $M_23C_6$. Aging for long-time at high temperature caused the growth of martensite lath and the decrease of dislocation density resulting in the decrease in strength. However, the evolution of secondary phases had influence on hardness, yield strength and impact property. In the group A specimen aged at $600^{\circ}C\;and\;650^{\circ}C$, Laves phase was observed. The Laves phase caused the increase of the hardness and the decrease of the impact property. In addition, the abrupt growth of secondary phases caused decrease of the impact property in both A and B group specimens.

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References

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