Abstract
Abstract The effects of potential step polarization and hydrogen overpotential on crack propagation and crack arrest are investigated for T-250 maraging steel (yield strength = 1708 MPa [248 ksi]) and PH 13-8 (UNS S13800) steel (yield strength = 1467 MPa [213 ksi]). The critical stress intensity threshold for hydrogen-assisted cracking, KISCC, measured as a function of potential using a rising step load bend (RSL-B) technique, is compared to KISCC vs potential curves by other investigators. Both materials showed an increase in KISCC with increasing potential. A fractographic examination of specimens tested at different potentials revealed distinct changes in the fracture mechanism as a function of potential that are explained in terms of the decohesion model for hydrogen-assisted cracking. The crack arrest and propagation experiments reveal that the crack tip responds instantly to changes in the hydrogen activity; i.e., step polarization. The ability to arrest and restart crack propagation by stepping the...
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