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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 713 - 722 (10page)
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초록· 키워드
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Long-term creep life (5000–100,000 h) predictabilities, based on the short-term creep life data (~ 5000 h), for Grade 92steel were investigated among major creep life prediction models, Larson–Miller parameter (LMP), normalized power law(NPL) and Wilshire models. The NPL and Wilshire models showed superior short-term creep data based long-term creeplife predictabilities to the LMP model. In particular, the Wilshire model showed relatively accurate predictions (within anerror range of 7%–10%), which seemed to be due to reasonable coupling of the normalized stress with the temperaturedependentrupture life term in a form of the cumulative distribution function. Both NPL and Wilshire models, calibrated bythe short-term creep life data, showed a transition in creep mechanism at a similar normalized stress. Thermodynamics-basedkinetic simulation (MatCalcTM) results for major precipitates (M23C6, MX and Z phases) of Grade 92 steel suggested thatthe creep transition is associated with coarsening of M23C6precipitates at high temperatures (above 600 °C), which led tothe degradation of the creep property.
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