Effect of hydrogen on evolution of deformation microstructure in low-carbon steel with ferrite microstructure

In this study, the deformation microstructure of hydrogen-charged ferritic-pearlitic 2Mn-0.1C steel was characterized using SEM-BSE, SEM-EBSD, TEM, and neutron diffraction. The microscopic mechanism hydrogen-related quasi-cleavage fracture along {011} planes also discussed. It found that hydrogen increased relative velocity screw dislocations to edge dislocations, leading a tangled dislocation morphology, even at initial stage (e = 3%). addition, density later 20%) in presence hydrogen. Based on experimental results, it is proposed high vacancies accumulated slip by jog-dragging coalescence led planes.