Microstructure and mechanical properties of electron beam welding CrCoNi MEA/GH3536 superalloy--numerical and experimental analysis

Abstract CrCoNi Medium Entropy Alloy’s superior tensile strength and ductility make it promising for engineering structures. Yet, its welding research is in its infancy, limiting its use. This study used Electron Beam Welding to join CrCoNi MEA and GH3536 superalloy for the first time. Through finite element modeling and experimental validation, we predicted temperature profiles, weld morphology, and residual stress distributions, which are crucial for understanding the mechanical behavior of the welded joints. The joints showed a tensile strength of 555 MPa and 18.5% ductility at 298.15 K, with fractures mainly in the weld zone. Our findings, including fracture patterns analysis and microstructure in the weld seam, provide insights into CrCoNi MEA welding and its potential in engineering structures.