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Mechanisms and controlling factors in creep fracture

1988; Elsevier BV; Volume: 103; Issue: 1 Linguagem: Inglês

10.1016/0025-5416(88)90556-3

1873-4936

William D. Nix,

High-Velocity Impact and Material Behavior

The mechanisms of high temperature intergranular creep fracture are reviewed in an effort to determine the controlling factors for this failure process. We show that failure occurs by cavity nucleation and growth on grain boundaries but that these processes are rarely controlling factors in creep fracture. The redistributions of stress that occur in a creeping solid, by both grain boundary sliding and inhomogeneous cavitation, are shown to be more important. As a consequence, creep fracture is usually controlled by the creep process itself. The implications of these findings for creep fracture are discussed. Some brief remarks about the design of materials with creep fracture resistance are also given.