Observations on hydrogen induced delayed plasticity and cracking in 4340 steel
The crack growth rates measured by potential drop provided strong evidence that crack advance occurs continuously during hydrogen assisted cracking. If crack growth occurred by the stepwise HIDP-C mechanism, variations in growth rate would be expected to appear in the potential drop results. For example, during the period of plastic zone extension, a low crack growth rate would be expected, followed by a period of higher crack growth rate during actual extension of the crack. The results obtained in this investigation do not eliminate the possibility that stepwise crack growth occurred at different points along the crack front at different times, appearing as continuous average crack advance. Furthermore, these results do not provide evidence for the mechanism of crack extension. The results do show that the average crack front advance is continuous during hydrogen assisted cracking, not stepwise, as would be expected for the HIDP-C mechanism of crack growth. 13 references.
- OSTI ID:
- 5791576
- Journal Information:
- Corrosion (Houston); (United States), Vol. 39:2
- Country of Publication:
- United States
- Language:
- English
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