Analysis on Microstructure of Laser Brazing Diamond Grits with a Ni-Based Filler Alloy

Zhi Bo Yang; Jiu Hua Xu; Ai Ju Liu

doi:10.4028/www.scientific.net/AMR.97-101.3879

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Analysis on Microstructure of Laser Brazing Diamond Grits with a Ni-Based Filler Alloy

Abstract:

Brazing diamond grits onto steel substrate using a Ni-based filler alloy was carried out via laser beam in an argon atmosphere. The microstructure of the interfacial region among the Diamond grits and the filler layer were investigated by means of scanning electron microscopes (SEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). Meanwhile, the formation mechanism of carbide layers was discussed. All the results indicated that the active element chromium in the Ni-based alloy concentrated preferentially to the surface of the grits to form a chromium-rich layer, and the hard joint between the alloy and the steel substrate is established through a cross-diffusion of iron and Ni-based alloy through parameters optimization.