The effects of irradiation on the fatigue properties of stainless steel were studied under the condition of in situ irradiation or after irradiation using 20 MeV protons. Strain controlled fatigue tests using a resonant and a drive force DF at constant were measured in situ during the test. Whereas the present damage rate was very low, the apparent effects of in situ irradiation on the fatigue properties were observed, e.g. the elongation
Strain-controlled fatigue tests using a flexural resonant vibration were performed on miniature temperatures between 293K and 573K. From the investigations of in situ changes in the resonant period , P, and in the drive force, DF, applied to the specimens during the fatigue tests, the following results were obtained.(1) Overlapped on general changes in P and DF, small and step-like changes in P and DF were fatigue damages. (2) General changes of P at the middle stage during the fatigue tests were a slight increase (softening) at T=333 K but a strong decrease (hardening) at T=573 K. From the detailed study of
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