1978 年 27 巻 292 号 p. 87-91
Fracture surface of SUS 304 stainlests steel subjected to stress corrosion cracking (SCC) in boiling 42% MgCl2 solution was investigated fractographically by scanning electron microscopy. To determine the orientation of fracture surface, etch pits were formed on the fracture surface by the electro-etching method in 1N H2SO4+100mg/L NH4SCN solution. It was found that the fracture surface of SCC was mostly in {100} plane, which was determined by the morphology of etch pits. This shows that the crack path depends on the orientation of crystal grain and the direction of stress.