On the Crack Length and the Low Temperature Brittleness of a Carbon Steel Subjected to Corrosion Fatigue

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  • 腐食疲れを受けた鋼材のき裂深さと低温ぜい性について
  • フショク ツカレ オ ウケタ コウザイ ノ キレツ フカサ ト テイオンゼイ セイ ニ ツイテ

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Abstract

The lengths of the cracks formed by the corrosion fatigue in saline are studied on the smooth specimens of a carbon steel, and the effect of corrosion fatigue on the low temperature brittleness is discussed. The cracks occur at early stage of the fatigue life and the cyclic rates of their propagation dl/dN depend on the actual stress σck repeated at the root of the crack, where k represents the notch effect of corrosion pits increasing with time. The transition temperature Tr °C. of the specimens having the cracks caused by corrosion fatigue and the rate of its change with cycle ΔTr/ΔN rise with increasing of cyclic ratio. It also rises according to the increase of square root of crack length l1/2, having no relation to the nominal stress σc of the corrosion fatigue.

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