Effect of Carbon Content on Fatigue Crack Initiation of Plain Carbon Steel.

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  • ＳＣ材の高サイクル疲労き裂発生過程における炭素量の影響
  • SCザイ ノ コウ サイクル ヒロウ キレツ ハッセイ カテイ ニ オケル タ

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Abstract

The influence of carbon content on fatigue crack initiation behavior has been investigated on three kinds of carbon steels with the same size of ferritic grains by the plastic replica method. The fatigue tests have been mainly performed under the stress level larger than the fatigue limit of each material by the same magnitude, using the rotating bending fatigue testing machine. From the experimental results, the carbon content of each material affects the crack initiation behavior under the same stress amplitude for the three kinds of carbon steels, comparing with that under the stress level larger than the fatigue limit of each material by the same magnitude. In addition, the carbon content of material hardly affects the crack propagation behavior. It is considered that the above result is due to the restriction of plastic flow by pearlitic grains.

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