Abstract
The results of continuous-cycling and hold time tests on type 304 stainless steel in an ultrahigh vacuum environment are presented and compared with results of similar tests performed in air. Under continuous symmetrical cycling the fatigue life is significantly longer in vacuum than in air. The strain rate (or frequency) strongly influences life in both air and vacuum. In a compressive hold time test the effect of environment on life is similar to that in a continuous-cycling test. However, tensile hold times are nearly as damaging in vacuum as in air. On the basis of these results the effects of environment, strain rate, hold times and wave shapes that involve “slow-fast” and “fast-slow” loadings on high temperature low cycle fatigue resistance are discussed in terms of a damage rate approach to creep fatigue analysis.
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