Abstract
The cracking of IN718 was studied under static loads in air and oxygen and found to undergo oxygen-induced dynamic embrittlement in the same way as in steels with surface-adsorbed sulfur and in bronze with surface-adsorbed tin. When the oxygen supply at the surface is plentiful, the intergranular fracture surface exhibits decohesion with no apparent plasticity, which is consistent with stress-induced oxygen penetration on the nanometer scale ahead of a sharp crack. In one-atmosphere oxygen, cracking was observed to occur at rates on the order of 10 -5 m/sec, An advancing crack could be abruptly arrested by switching the atmosphere from oxygen to vacuum of less than 10 -4 torr.
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