Abstract
Rotating bending fatigue tests were carried out in air and in pure argon to clarify the effect of the oxide-induced crack closure on the crack non-propagation. The used material were Ti added extra low carbon steel with no strain ageing, 0.02%C steel with single ferrite phase and annealed 0.2%C steel. The result obtained are as follows. (1) Threshold stress for fatigue crack growth was smaller for Ti added extra low carbon steel in the argon than in the air, though the fatigue crack has the tendency which propagates slowly in the argon than in the air. The above result shows that the oxide-induced crack closure plays role in crack non propagation. (2) It seems that the influence of oxide-induced crack closure on crack non-propagation is smaller compared with influences strain ageing and micro structures. (3) Non-propagating crack was observed in material with single ferrite phase even when strain ageing and oxide induced crack closure did not occur.
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