表面硬化材の疲労強度に及ぼす残留応力の影響

概要

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It is well-known that the enormous increase in fatigue strength of case gardened steel is due to the high compressive residual stress in the material and to the doubled hardness caused by heate treatment, and that the effect of the residual stress on the endurance limit can be accounted for by taking it as the mean stress. In this paper the fatigue test results which were obtained of the carburized and induction hardened steel, have been re-examined from the viewpoint of crack propagation process. It appears that the fatigue strength of case hardened steel can be regarded as resistance against fatigue crack propagation in the specimen having minute flaw, because, in highly hardened material, The micro inclusions and metallurgical discontinuity can be taken as the origins of fatigue cracks.
社団法人日本材料学会の論文
1972-08-15