Abstract
Measurements of crack growth at fatigue frequencies of 100, 1 and 1/60 Hz in some gaseous environments show that changes of crack rate with frequency can be partly or entirely due to environment, depending on the alloy. The effects of oxygen, water vapor alone and water vapor in the presence of oxygen and nitrogen have been studied. The critical gas pressures which are necessary to affect crack growth depend on frequency and crack rate. Mechanisms for the effects observed are discussed and results are interpreted in terms of gas adsorption at the crack tip and the immediate action of adsorbed surface layers on the crack while it is growing.
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