Abstract
The crack tip deformation and surface potential distribution on SUS316L stainless steels were observed by SKFM and KFM. The existence of hydrogen-induced martensite was examined by the magnetic force microscope (MFM) observations. The results showed that the less noble potential region existed near the crack tip. MFM and KFM observation showed hydrogen-induced martensite existed at the less noble potential region. Repeated SKFM observations revealed that the crack is formed by the movement of hydrogen-induced martensite.
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