对AISI304不锈钢在沸腾的42％氯化镁溶液中应力腐蚀开裂的断口,用扫描电镜从断口形貌上进行了研究。为确定断裂面的位向,采取了在1NH_2SO_4+100毫克/公升NH_4SCN溶液中用电解浸蚀法在断面上形成浸蚀坑。根据浸蚀坑的形态弄清了应力腐蚀开裂的断面几乎都是{100}面。换言之,开裂的路径是由晶体取向和应力方向决定的。此外,仔细地观察平坦的刻面时常常发现辉纹状花样。 The fracture of stress corrosion cracking of AISI304 stainless steel in a boiling 42% magnesium chloride solution was studied by scanning electron microscopy (SEM). In order to determine the orientation of the fracture surface, an etching pit was formed on the section by electrolytic etching in 1NH_2SO_4 + 100 mg / L NH_4SCN solution. According to the shape of the etching pit, the stress corrosion cracking cross section is almost always {100} plane. In other words, the path of cracking is determined by the crystal orientation and stress direction. In addition, gritty patterns are often found when looking carefully at flat facets.