Role of residual stresses induced by industrial fabrication on stress corrosion cracking susceptibility of austenitic stainless steel

摘要

Effect of residual stress generated during tube fabrication, roll expansion and machining of stainless steel on the stress corrosion cracking (SCC) susceptibility was studied by testing fabricated tubes, tube-tube sheet joint and heavily machined plate of austenitic stainless steel (SS) in boiling MgCl_2. U bend samples of machined plate were exposed to acidified SO_4 + Cl~- environment at room temperature to study its ambient temperature SCC behavior. The results correlate the SCC behavior of the SS tubes and roll expanded joints to the nature and magnitude of residual stresses present. The study also highlights the distinct difference in ambient temperature SCC behavior of machined vs. nonmachined surfaces.