低温焼入れによる鋼の材質の変化について : (第4報)切欠き疲れ強さの改善

概要

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The low-temperature-quenching (LTQ) is greatly effective on improvement of the mechanical properties, especially of the fatigue strength, of steel. The effect of the LTQ on the increase of the fatigue strength is more remarkable in specimens with notch than in plain specimens. This reason is as fallows : (a) The strengthening of the ferrite by aging during repeated loading must be more remarkable due to the sharp concentrated stress at the notch root. (b) Before the formation of fatigue cracks at the notch root, there appears a region which resists the creation of cracks. This region is not only strengthened but also expands inward more and more by repeated loading in the low-temperature-quenched specimens. (c) When a fatigue crack is once formed, the resistance against its propagation is greater in specimens with notch than in plain specimens.
社団法人日本機械学会の論文
1957-07-25