Journal
MATERIALS & DESIGN
Volume 65, Issue -, Pages 644-651Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2014.09.070
Keywords
Creep crack growth rate; Creep model; Creep ductility; Stress-regime; Chromium alloy steel
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Funding
- National Natural Science Foundation of China [51375165, 51325504]
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In this paper, the stress-regime dependent creep model and ductility have been implemented in a ductility exhaustion based damage model, and their influence on creep crack growth (CCG) behavior of materials have been analyzed. By using the stress-regime dependent creep model and ductility, the CCG rate in a Cr-Mo-V steel over a wide range of C* has been predicted by finite element analyses. The predicted CCG rates agree with the available experimental data in the literature. The analysis results show that with increasing C*, the creep model and ductility for determining crack-tip creep damage accumulation change from the low-stress regime model and ductility through a combination of low- and high-stress regime model and ductility to high-stress regime model and ductility. These changes lead to the line segments of the da/dt-C* curves. In CCG life analyses and designs of high temperature components, the stress-regime dependent creep model and ductility need to be used. (C) 2014 Elsevier Ltd. All rights reserved.
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