Relationship Between Creep Damage Parameters And Distribution Of Creep Cavities On Grain Boundaries
Price
Free (open access)
Transaction
Volume
13
Pages
8
Published
1996
Size
1,032 kb
Paper DOI
10.2495/LD960531
Copyright
WIT Press
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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