Interface and Heat-affected Zone Features of Dissimilar Welds between AISI ۳۱۰ Austenitic Stainless Steel and Inconel ۶۵۷

The aim of this paper is to characterize welding of AISI ۳۱۰ austenitic stainless steel to Inconel ۶۵۷ for use in oil-refining industries. The welds were produced using four types of filler materials; nickel-based alloys designated as Inconel ۸۲, A, ۶۱۷, and ۳۱۰ SS. The interfaces and heat-affected zones were characterized by optical and scanning electron microscopy. Interfaces on the two sides of the joints showed unmixed and heat-affected zones, while a partially melted zone was observed in the interdendritic regions of the HAZ in Inconel ۶۵۷. The microhardness profile from the base metal to the HAZ exhibited high hardness in the case of Inconel ۶۵۷ as an indication of α-Cr precipitation in the HAZ of all the filler materials investigated and as the occurrence of precipitation hardening. It was concluded that undesirable regions such as UZ, HAZ, and PMZ have the least average size for Inconel ۸۲ and ۳۱۰ SS weldments among the weld metals studied.

کلیدواژه ها:

AISI ۳۱۰ ، Inconel ۶۵۷ ، Dissimilar welds ، Heat-affected zone ، Precipitation