Abstract

Exotic materials are high-performance alloys of stainless steel, aluminum, nickel, titanium, magnesium and copper. Hastelloy C-276 (UNS N10276) is known as an exotic material and is a nickel-chromium-molybdenum alloy with very high corrosion resistance to many chemical environments. In this study, the weldability of Hastelloy C-276/Hastelloy C-276 alloys welded with Gas Tungsten Arc Welding (GTAW) and the microstructure properties resulting from welding were investigated. Welding process was performed using ERNiCrMo-4 welding filler wire and argon gas protection. The results showed that the welded materials did not have any defects or discontinuities and had high quality welding materials. Compared to the base metal, an approximately 21% increase in the ultimate tensile strength and a 32% increase in yield strength of the welded samples were obtained. These improvements were attributed to the formation of cellular, columnar, and equiaxed dendrites in the microstructure after welding.

Keywords:Hastelloy C-276; Gas tungsten arc welding (GTAW); Welding; Microstructure; ERNiCrMo-4