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CrMo강 용접계면균열의 크리프-피로 균열성장거동

Creep-Fatigue Crack Growth at CrMo Steel Weld Interface

  • 백운봉 (한국표준과학연구원 산업측정표준부) ;
  • 윤기봉 (중앙대학교 기계공학부) ;
  • 이해무 (한국표준과학연구원 산업측정표준부) ;
  • 서창민 (경북대학교 기계공학부)
  • 발행 : 2000.12.01

초록

Creep-fatigue crack growth behavior was experimentally measured particularly when a crack was located in the heat affected region of lCr-5Mo steel. Load hold times of the tests for trapezoidal fatigue waveshapes were varied among 0, 30, 300 and 3,600 seconds. Time-dependent crack growth rates were characterized by the $C_r$parameter. It was found that the crack growth rates were the highest when the crack path was located along the fine-grained heat affected zone(FGHAZ). Cracks located in other heat affected regions had a tendency to change the crack path eventually to FGHAZ. Creep-fatigue crack growth law of the studied case is suggested in terms of (da/dt)$_{avg}$ vs. ($C_t$)$_{avg}$ for residual life assessment.

키워드

참고문헌

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