Abstract
A new method was studied to evaluate the stress corrosion susceptibility of austenitic stainless steels from stress-strain curves observed under controlled tensile strain rate in MgCl2 solution boiling at 143°C. The results indicated that when the strain rate was low enough to cause metal dissolution at slip steps, stress corrosion cracking occurred. The fracture strain decreased with the decrease of strain rate. A good relation was obtained between the fracture time in the constant load test and stress corrosion susceptibility parameter, Pc(εc+1)⁄P(ε+1), where ε is the strain at the maximum load P under the strain rate of 0.67×10−2 sec−1, and εc is the strain at the maximum load Pc under the strain rate of 1.67×10−5 sec−1 in MgCl2 solution boiling at 143°C.
