Mechanism of Stress Corrosion Cracking of Face-Centered-Cubic Alloys

application/pdfThe stress corrosion behaviours of austenitic stainless steels, Inconel and a 70Cu-30Zn alloy in corrosive environments were investigated with thin-foil and bulk specimens. In order to study the segregation of solute atoms in austenitic stainless steels, Instron tensile tests were carried out at 200℃ and at a room temperature. The turnished surface film obtained in Mattsson's solution at pH 7.4 was also examined by electron diffraction method. The mechanism of the nucleation of transgranular stress corrosion cracking of austenitic stainless steels in a boiling 42% MgCl_2 aqueous solution is different from that of the propagation. The surface film has an important role in the intergranular stress corrosion cracking of α-brass in ammonia aqueous solutions, and the initiation of micro pits (preferential dissolution at the fresh slip steps) is not directly associated with the crack nucleation and its propagation.紀要類(bulletin)departmental bulletin pape