화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.15, No.1, 19-24, January, 2005
DOI10.3740/MRSK.2005.15.1.019  Export Citation
초초임계압 발전용 소재의 장시간 열처리에 따른 미세조직 변화와 기계적 특성의 상관관계 연구
A Study on Correlation of Microstructural Degradation and Mechanical Properties of 9-12%Cr-Steel for Ultra-Super Critical Power Generation
주성욱1, 유정훈1, 신기삼1, 2, †, 허성강1, 2, 이재현1, 2, 석진익3, 김정태3, 김병훈3
  • 1창원대학교 재료공학과
  • 2창원대학교 금속재료공학과
  • 3두산중공업
Sungwook Joo1, Junghoon Yoo1, Keesam Shin1, 2, †, Sung Kang Hur1, 2, Je-Hyun Lee1, 2, Jin Ik Suk3, Jeong Tae Kim3, and Byung Hoon Kim3
  • 1Dept. of Materials Science and Engineering, Changwon National University, Korea
  • 2Dept. of Metallurgy and Materials Science, Changwon National University, Changwon, 641-773, Korea
  • 3Doosan Heavy Industries & Construction Co., LTD., Changwon, 641-792, Korea
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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 ? 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 2 3C 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 ? Cand650 ? 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.
Keywords:ultra-super critical power generation;laves phase
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