Abstract
The major factor dominating creep and creep-fatigue failure at high temperature for SUS304 stainless steel is the nucleation and growth of creep cavities on grain boundaries. In this study, previously proposed cavity growth models for creep conditions were expanded to give models for creep-fatigue condition. The analytical cavity growth rate was compared with experimental data obtained in our prevlcus study. As a result, it was found that the cavity growth process under stress-controlled creep-fatigue conditions continuously observed by the SEM could be explained using the cavity growth rate equation consisting of the sum of constrained diffusion-controlled and deformation-controlled growth rates. Also, a cavity growth mechanism map, which can be applied to various load patterns, was developed based on the models for cavity growth in creep conditions.
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