高周波部分焼入れしたときの大形試験片による疲れ試験結果について

概要

論文の詳細を見る
When induction hardening is applied to axles, armature shafts and crank shafts, there is an apprehension that the fatigue strength may be reduced in the transitional zone between the hardened and the nonhardened parts. To disperse such apprehension, a rotary-bending-fatigue test was made on a partially induction-hardened large test piece (dia=70mm). The following facts have been revealed through the test : i) The fatigue strength of the transitional zone is not reduced but rather improved in comparison with that of the mother material. ii) Fatigue cracks happened at a spot considerably removed from the transitional zone. Following the fatigue test, the residual stress in the test piece was measured using strain gauges with the results showing that the residual stress of the transitional zone is a compressive one, which presumably explains the above facts (i) and (ii)
一般社団法人日本機械学会の論文
1958-11-25