Evaluation of microstructure and mechanical properties of dissimilar joining of Inconel 718 superalloy to 316 austenitic stainless steel
In this study, the microstructure and mechanical properties of dissimilar joining of Inconel 718 superalloy to 316 austenitic stainless steel were investigated using tungsten-gas arc welding method with two filler metals 718 (ERNiFeCr-2) and 625 (ERNiCrMo-3) . After welding, the microstructure and mechanical properties of different joint areas were evaluated using optical microscope and scanning electron microscope. The precipitates in the interface and their chemical composition were determined using EDS analysis. Also, the mechanical properties of the joint were evaluated using tensile, impact and microhardness tests. Microstructural investigations showed that the freezing structure of filler metal 718 has austenitic microstructure with dendritic network along with carbide distribution and filler metal 625 has also created austenitic microstructure with dendritic network. In the tensile test, filler metal 718 has the highest tensile strength of 528 megapascals and the failure of all tested samples occurred in the area of the austenitic stainless steel base metal 316. The results of the impact test showed that the maximum amount of fracture energy is 50 J for filler metal 625. The micro-hardness test also determined that the 718 filler metal has the highest hardness of 214 Vickers.
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