Abstract
Anodic current transients obtained by using the potentiostatic double pulse (PDP) technique for BHS-1, 4037, 1022 QT and 1022 CN steels were analysed with a diffusion-trapping model to determine the hydrogen trapping constant and hydrogen entry fluxes. The BHS-1,4037 and 1022 QT steels exhibited similar high values of trapping constants. Hydrogen entry fluxes were found to be similar for BHS- 1 and 4037 steels; these fluxes are higher than those for 1022 QT and 1022 CN steels. Slow-strain-rate tests showed that the steels with higher values of hydrogen trapping constants and ingress fluxes were more susceptible to hydrogen-induced cracking.
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