Abstract

Creep crack initiation and creep crack growth behaviours were studied in two creep ductile materials, an austenitic stainless steel and a low alloy ferritic steel. A number of limitations of the global approach to creep cracking, in which unique correlations between time to initiation or creep crack growth rate and the load-geometry parameter, C*, are shown. A local approach to creep cracking is developed in the austenitic steel. In this material a damage function based on the measurement of intergranular damage in notched specimens is established and then applied ahead of the crack tip to simulate numerically crack growth. A good agreement between observed and calculated crack growth curves is obtained using crack initiation data.

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