The Initiation of Grain-Boundary Fracture During Creep and the Toughening Mechanism in Heat-Resisting Alloys : Series A : Solid-Mechanics, Strength of Materials

Abstract

A discussion was made on the initiation of grain-boundary fracture during creep and the toughening mechanism in heat-resisting alloys, using two kinds of continuum mechanics models which incorporated the recovery effect by diffusion of atoms. The result of the calculation based on these models was compared with that of the creep rupture tests on austenitic 21Cr-4Ni-9Mn steel. These models were than applied to the prediction of the rupture life in creep. A good correlation was found between the result of the calculation based on the models and that of the experiment. Further, a simple heat treatment was proposed for the improvement of the creep-rupture properties.