The Effect of Machine Worked Surface Layer on Fatigue Strength of 18-8 Stainless Steel

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  • 18-8ステンレス鋼の機械加工層が疲労強度に及ぼす影響について
  • 18-8 ステンレス コウ ノ キカイ カコウソウ ガ ヒロウ キョウド ニ オヨボス エイキョウ ニ ツイテ

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Abstract

The authors have studied on the problem of the relative effect of work-hardening and residual stress in the machine-worked surface layer on the endurance limit of 18-8 stainless steel by the rotary bending fatigue tests which consisted of three series as follows:<br>(A) Series: Tests of the specimens with machine-worked layer and negligible residual stress.<br>(B) Series: Tests of the specimens with thermal residual stress and without machine-worked layer.<br>(C) Series: Tests of the specimens with machine-worked layer and thermal residual stress, corresponding to the synthesis of the two Series (A) and (B).<br>The following conclusions may be drawn from this investigation. The endurance limit depends on three factors, such as surface hardness, the depth of the machine-worked layer and its residual stress. Comparing with the endurance limit of the standard specimen with no machine-worked layer (accurately with a slightly polished layer by 0/4 emery paper) and no residual stress, increasing ratio of the endurance limit is simply given as the sum of increasing ratio resulting from the work hardening and that from the residual stress. The increasing ratio by work-hardening is obtained by multiplying that depending on increase of surface hardness by the amendment coefficient which is a function of the depth of the machine-worked layer.

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