Paper Title:
Statistical Analysis of Creep Crack Growth Behavior in Modified 9Cr-1Mo Steel
  Abstract

In this paper, a series of statistical studies were conducted on creep crack growth behavior of Grade 9Cr-1Mo steel for next generation reactor. Creep crack growth tests were performed on pre-cracked compact tension (CT) specimens under the applied load ranges from 3800 to 5000N at the identical temperature condition of 600oC. The creep crack growth behavior has been analyzed statistically using the empirical equation between crack growth rate da/dt and C* parameter, namely da/dt=B(C*)q. First, the determination methods of B and q obtained from experiments were investigated by the least square fitting method and the mean value method. The probability distribution functions of B and q have been investigated using the normal, log-normal and Weibull distribution. The constant B and q are followed well 2-parameter Weibull. Second, the creep crack growth rate data were generated by Monte-Carlo simulation method assuming the 2-parameter Weibull in B and q parameters. The probability distribution of creep crack growth rate for arbitrary C* parameter values seems to follow well Weibull distribution.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
516-519
DOI
10.4028/www.scientific.net/MSF.654-656.516
Citation
S. J. Kim, W. G. Kim, I. H. Jung, Y. W. Kim, "Statistical Analysis of Creep Crack Growth Behavior in Modified 9Cr-1Mo Steel", Materials Science Forum, Vols. 654-656, pp. 516-519, 2010
Online since
June 2010
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$32.00
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