高周波焼入した試験片の二, 三の疲れ試験の結果について

概要

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Fatigue test results on induction-hardened test pieces, were investigated. The results are summarized as follows : (1) When the local parts of test pieces are induction-hardened, the fatigue strength of the transitional zone between hardened and non-hardened parts is not weakened in comparison with that of the mother material. (2) When test pieces, with key way, of normalized carbon steel are induction-surface-hardened, the fatigue strength increased from 13 kg/mm^2 of normalized test pieces to 30 kg/mm^2 of induction-hardened one. (3) Fatigue limits of plain specimens are 29 kg/mm^2 for normalized C=0.4% steel and 66 kg/mm^2 for quenched and tempered Cr-Mn-Mo steel. And fatigue strengths of V-notched test pieces are 10.5 kg/mm^2 and 17 kg/mm^2 respectively. But the fatigue strength of induction-hardened V-notched specimens increased considerably and rose to about 50 kg/mm^2. This considerable increase of fatigue strength by induction-surface-hardening is due to i) residual compression stresses of surface and ii) toughness of surface-layer-material.
一般社団法人日本機械学会の論文
1952-11-25