Author(s)

N. Tada, T. Kitamura & R. Ohtani

Abstract

Several kinds of creep damage parameters, such as area fraction of cavities, fraction of cavities on grain boundary lines, areal cavity density, and A- parameter, have been proposed and examined for the lifetime assessment of high-temperature components. In this study, physical meaning of damage parameters is analyzed on the basis of a probabilistic model of creep cavities where spherical cavities with the same radius are randomly distributed on every grain boundary plane nearly perpendicular to the stress axis direction. 1 Introduction Under creep dominant conditions, cavities initiate along grain boundaries and their linkage forms intergranular cracks the size of which is about one grain boundary. Then, these intergranular cr

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