The pitting resistance of AISI(1) 316L stainless steel (SS) weld metal in the as-welded and stress-relieved conditions was evaluated as a function of heat input. The results obtained indicated a decrease in the value of critical pitting potential in acidic chloride medium as the heat input was increased. However, on stressrelief heat treatment, the critical pitting potential remained unchanged with varying heat input, though its magnitude was much lower than that of the as-welded alloy. The deterioration in the pitting resistance on increasing heat input is discussed on the basis of enhanced segregation of solute elements like chromium and molybdenum to delta-ferrite and the presence of M23C6 carbides at the austenite/ferrite interface.
National Association of Corrosion Engineers
1988
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