Investigation of microstructure, mechanical, and corrosion behavior of nickel-based alloy 625/duplex stainless steel UNS S32205 dissimilar weldments using ERNiCrMo-3 filler metal

Microstructure and tensile-shear behavior of dissimilar resistance spot welds between 2304 duplex stainless steel and Inconel 718 superalloy

“…12,[19][20][21] Based on the literature, dissimilar joints between stainless steels and nickel-based superalloys have tremendously fascinated attention in applications, such as expansion joints, expansion bellows, pressure vessels, oil refinery steam generators, pipes of heat exchangers, chemical tankers, and so on. 22,23 The main reasons for the importance of dissimilar joints are the reduction of manufacturing costs and the improvement of design flexibility in dissimilar welding. 11,24 Besides, other advantages of dissimilar joints are a mixture of lower specific weight, superior mechanical properties, and high corrosion resistance of one of the alloys or both of them.…”

“…This was owing to the randomly produced grain orientation distribution. 45 Tümer et al 22 joined Inconel 625 superalloy to UNS S32205 duplex stainless steel via metal inert gas arc welding. They concluded that there were molybdenum and niobium-rich precipitates between the dendritic arms of austenite in the FZ.…”

“…47 Lastly, it should be mentioned that RSW is a fusion joining process, while there are solidstate joining methods such as friction stir welding (FSW) technique, which could also be used for the welding of dissimilar alloys. 48 Though there are numerous studies on the dissimilar welding between nickel-based superalloys and stainless steels, 22,24,45,46 however, few works can be found concerning the dissimilar resistance spot welds between them, particularly between 2304 duplex stainless steel and Inconel 718 superalloy. Thus, with regard to the industrial significance of the RSW technique as well as wide applications of dissimilar resistance spot welds between stainless steels and nickel-based superalloys, evaluation of dissimilar resistance spot welds between 2304 duplex stainless steel and Inconel 718 superalloy is definitely needed.…”

“…However, because of the formed inclusions and intermetallic phases, this was not as high as for both base metals (BMs). 22 Ahmad et al 46 studied the behavior of dissimilar laser beam welds between Inconel 625 superalloy and 2205 duplex stainless steel. It was disclosed that there was multidirectional grain growth in the FZ microstructure for the cellular and columnar dendrites at high heat input and relatively finer cellular and columnar dendrites at low heat input.…”

Effect of heat treatment atmospheres on microstructure evolution and corrosion resistance of 2205 duplex stainless steel weldments

“…Furthermore, the selection of the welding electrode is of paramount importance in controlling the microstructure of the welding area and thus on the properties after welding [15][16][17] . An attempt has been made to investigate the effect of filler metal on solidification, microstructure, and mechanical properties of the dissimilar weld between super duplex stainless 2507 and high strength low alloy API X70 pipeline steel by Khan et al 15 .…”