Simplified prediction model of thermal aging effect on fracture for cracked cast austenitic stainless steel components

초록

An analytical equation to predict the effect of thermal aging on the maximum load of a cracked CASS (cast austenitic stainless steel) pipe is proposed using simplified elastic-plastic fracture mechanics analysis based on the reference stress approach. According to the equation, the ratio of the maximum load of thermally aged and unaged CASS pipe can be characterized by one parameter which includes mechanistic variables reflecting the thermal aging effect on tensile and fracture toughness. For validation, two CASS materials (CF8M and CF8A) under unaged and aged conditions with different aging times were used. The ratios of maximum loads determined for the unaged and aged circumferentially cracked CASS pipes agree well with predictions.

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