HYDROGEN-ASSISTED STABLE CRACK GROWTH IN IRON-3 WT/100 SILICON STEEL

摘要

Observations of internal hydrogen cleavage in Fe-3Si are reported. Hydrogen-assisted stable crack growth (H-SCG) is associated with cleavage striations of a 300 nm spacing, observed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). High resolution SEM revealed liner striations, previously undetected, with a spacing of approximately 30 nm. These were parallel to the coarser striations. Scanning tunnelling microscopy (STM) also showed the fine striation spacing, and gave a striation height of approximately 15 nm. The crack front was not parallel to the striations.