Microstructure and Mechanical Properties of Inconel 617/AISI 310 Electron Beam Welds
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The aim of this research was to analyze the relationship between the microstructure and mechanical properties of Inconel 617/AISI 310 stainless steel electron beam welds. The microstructure of the weldments was studied using scanning electron microscopy and the electron backscatter diffraction (EBSD) technique. Mechanical properties of the weldments, including tensile behavior, hardness and impact toughness resistance, were evaluated. The results indicated that the electron beam welding process led to the segregation of elements in the weld metals, and the formation of secondary phases rich in Co, Nb and Mo was recorded too. EBSD studies also showed that the grains of the weldment had a variety of orientations. In addition, the fraction of coincident-site lattice boundaries was non-uniformly distributed across the weldments. The tensile strength of the weldments was similar to that of the AISI 310 parent metal, and the tensile samples underwent the ductile fracture mode. Upon Charpy impact testing, the weldments underwent notch deformation and the ductile mode of fracture; however, the impact toughness resistance was lower, as compared with the base metals. Based on the performed tests, the heat input of 168 kJ/m could be recommended.
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