Effect of grain size and second phase particles On the hydrogen occlusivity of iron and steels

摘要

The trapping of hydrogen by various interfac- Es in iron and steels has been studied. The hydrogen con- Tent of pure iron specimens was found to depend more On hydrogen than those of low angle, and thus specimens With low angle grain boundaries were less susceptible to Hydrogen damage. Inclusions and thermo-mechanical Treatments were also significant in determining the hy- Drogen pick-up in iron. A critical volume fraction of in- Clusions was detected. Below which no hydrogne- Induced cracking occurred. Ferrite/pearlite and pearl- Ite/pearlite colony interfaces in steel were found to trap Hydrogen, whereas the ferrite/comentite interface within The pearlitic colonies had little effect on the hydrogen Occlusivity.