Dissimilar diffusion welding of some equiatomic FCC-structured CoCrFeNi-based binary and multi-component alloys to 316 L stainless steel.
Résumé
This investigation was carried out to assess the joint integrity of dissimilar diffusion welding of some equiatomic binary and multi-component alloys (MCAs), viz. CoNi, CoCrNi and CoCrFeNi, to 316L stainless steel (SS316L). The microstructures and chemical composition gradients across the bond interfaces were examined by a Scanning Electron Microscope (SEM) equipped with an Energy Dispersive Spectrometer (EDS), Electron Back Scattered Diffraction (EBSD) and X-ray Diffraction (XRD) analyses, while the mechanical properties were assessed by shear tests. The binary and multi-component alloys were successfully joined to SS316L with low interfacial defects and without any compositional segregation or formation of secondary intermetallic compounds at the bond interfaces. The shear tests revealed that SS316L-CoCrNi and SS316L-CoCrFeNi joints offered good shear strength and ductility which are comparable to that of SS316L similar joints, while SS316L-CoNi joint displayed the least mechanical performances.
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