Abstract
This paper examines the processes of micro structural degradation leading to intergranular creep fracture with the object of being able to provide a predictive metallurgical basis for problems of designing accurately for the complex conditions of creep encountered in modern engineering service, Creep and fracture under multiaxial stress states are first reviewed in detail to establish an appropriate base for an engineering theory of damage at high temperatures. Insight to be gained from metal science is then explored to provide the starting point for design life and residual life predictive schemes and the paper concludes with suggestions for new investigations. The overall orientation of the paper is to bring high temperature creep fracture into the main forum of applied fracture studies.
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