非金属介在物を持つ炭素鋼の疲れ強さ

概要

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To see the effect of post-annealing (annealing after the final surface finish of the specimens) the plain specimens on their fatigue strength, rotary bending tests were performed with specimens of various carbon steels (from 0.12%C to 0.79%C) as well as with specimens with a shallow round crack (made by fatigue) and following results were obtained : (1) The fatigue limits of plain specimens of carbon steels due to post-annealing decrease by 10〜20 per cent. of those of specimens without such annealing. (2) This decrease in fatigue stregth is reasonably explained by considering the notch-effects caused by hair cracks due to the slag contained therein near the surfaces of specimens during machining. The dimension of these hair cracks was estimated to be the same order of magnitude as the linear dimension of slag contained in steels.
一般社団法人日本機械学会の論文
1952-11-25