Evaluation of Microstructure and Mechanical Properties of Dissimilar Joining of Inconel 718 Superalloy to 316 Austenitic Stainless Steel

Document Type : Research Article

Authors

1 Masters،Department of Materials Engineering, Islamic Azad University, Najaf Abad, Isfahan, Iran.

2 Professor, Faculty of Materials Engineering and Metallurgy, Isfahan University of Technology, Isfahan, Iran.

Abstract

In this study, the microstructure and mechanical properties of dissimilar joining of Inconel 718 superalloy to AISI 316 austenitic stainless steel were investigated using the 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 an optical microscope and scanning electron microscope. The precipitates in the interface and their chemical composition were determined using energy-dispersive spectroscopy 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 an austenitic microstructure with a dendritic network along with carbide distribution and filler metal 625 has also created an austenitic microstructure with a dendritic network. In the tensile test, filler metal 718 has the highest tensile strength of 528 MPa 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 50J 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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References

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Amirkabir Journal of Mechanical Engineering
Volume 54, Issue 12
March 2023
Pages 2917-2936

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