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Four-point bending fatigue tests were conducted on a CrMnN austenitic steel at room temperature, at frequency of 20 Hz and the stress ratio of R = 0.1, in air. The fatigue strength of this CrMnN austenitic steel was measured to be 503 MPa in the maximum stress from the SN curve obtained. It was found that multi-site crack nucleation took place on the surface of the steel during fatigue, and that the...
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