Short-Term Creep Data Based Long-Term Creep Life Predictability for Grade 92 Steels and Its Microstructural Basis

Title
Short-Term Creep Data Based Long-Term Creep Life Predictability for Grade 92 Steels and Its Microstructural Basis
Authors
정우상심재혁김신찬최윤석
Keywords
Short-term creep life; Long-term creep life; Precipitates; Simulations; Grade 92 steel
Issue Date
2019-01
Publisher
Metals and Materials International
Citation
VOL 25-722
Abstract
Long-term creep life (5000– 100,000 h) predictabilities, based on the short-term creep life data (~ 5000 h), for Grade 92 steel 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 creep life predictabilities to the LMP model. In particular, the Wilshire model showed relatively accurate predictions (within an error range of 7%– 10%), which seemed to be due to reasonable coupling of the normalized stress with the temperaturedependent rupture life term in a form of the cumulative distribution function. Both NPL and Wilshire models, calibrated by the short-term creep life data, showed a transition in creep mechanism at a similar normalized stress. Thermodynamics-based kinetic simulation (MatCalcTM) results for major precipitates (M23C6, MX and Z phases) of Grade 92 steel suggested that the creep transition is associated with coarsening of M23C6 precipitates at high temperatures (above 600 °C), which led to the degradation of the creep property.
URI
http://pubs.kist.re.kr/handle/201004/69512
ISSN
1598-9623
Appears in Collections:
KIST Publication > Article
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