Pitting and crevice corrosion properties of a wide range of welded and unwelded high-alloy austenitic stainless steels have been compared, and microstructural reasons for differences in corrosion properties have been investigated. Corrosion problems related to banded structure and sigma-phase precipitation in the base metal, filler metal selection and unmixed zones in the weld metal, and the effect of heat-input of autogenous welds, have been documented. It was found that for best corrosion resistance: base metal should be homogenous and fully austenitic, enriched weld filler-metals are needed for high-molybdenum steels, and unmixed zones should be avoided. High heat-input autogenous welds were shown to be more susceptible to pitting attack because of a coarser more segregated dendrite structure and a greater incidence of surface-lying primary dendrites.

Subject
Weld attack, Steel structures, Filler metals, Microstructure, Nickel based alloys, Welding, Solidification, Crevice corrosion, Steel, Pitting, Corrosion resistance, Stainless steel, Weld metal
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1982
Association for Materials Protection and Performance (AMPP)
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