高周波焼入れの疲れ強さに関する影響についての一実験(その2)

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  • An Experiment on the Effect of Induction Hardening on Fatigue Strength (Report 2)
  • コウシュウハ ヤキイレ ノ ツカレ ツヨサ ニ カンスル エイキョウ ニ ツイテ ノ イチ ジッケン 2

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The authors have conducted fatigue tests on induction-hardened V-notched specimens with C=0.18% steel and C=0.38% steel. The experimental results are summarized in the following. (i) At C=0.18% steel, there is a great difference between σωκ1 and σωκ2, the former being 17kg/mm2 and the latter 45kg/mm2 ; however, at C=0.38% steel σωκ1 is equal to σωκ2, the value being about 46kg/mm2. (ii) After a stress between σωκ1 and σωκ2 was repeated 107 times, the authors examined the relation between the applied stress and the length of arrested cracks on C=0.18% steel, V-notched specimens. It was found that the length of crack became larger when the stress increased. (iii) The authors examined the relation between the number of repetitions and the length of crack. The crack initiated after about 103 repetitions ; and after 106 repetitions, the growth of crack stopped. (iv) The authors discussed the reason why there is a difference between σωκ1 and σωκ2 at C=0.18% steel, and why the value of σωκ1 is very great and why there is no difference between σωκ1 and σωκ2 at C=0.38% steel.

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