“…Thus, the effect of hydrogen is more pronounced as the tensile strength of the material increases. The localization of plastic deformation and the enhancement of void formation due to the presence of hydrogen in steel has been observed, 22,23) and it is believed that the interaction between dislocations activated by plastic deformation and hydrogen is involved in hydrogen-induced fracture. Figure 12 shows the transmission electron microscopy images of precipitation in the 800 MPa-class specimen (Fig.…”