SEDL / STP / STP995V1-EB / STP26774S

Creep Embrittlement Susceptibility and Creep Crack Growth Behavior in Low-Alloy Steels: An Assessment of the Effects of Residual Impurity Elements and Postweld Heat Treatment Condition on Creep Ductility and Crack Growth

Konosu, S
Senior research engineer and manager, JGC,

Maeda, K
Senior research engineer and manager, JGC,

Pages: 26    Published: Jan 1988

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Abstract

Creep embrittlement at 550C in the coarse grain region of the heat-affected zone (HAZ) of 1Cr-Mo steel was investigated. As a result, the effects of impurity elements and postweld heat treatment (PWHT) on such creep embrittlement and crack growth has been clarified. Creep embrittlement is caused by the nucleation of intergranular cavities at the prioraustenite grain boundary of the HAZ. Likewise, creep crack propagation is caused by the nucleation and linking up of intergranular cavities which precede the further growth of the main crack. The remaining creep crack growth life was predicted by a computer simulation of an actual reactor.