YG6X硬质合金/65Mn钢钎焊接头组织与性能研究OA

To meet the comprehensive requirements for high wear resistance and strength-toughness combination in circular saw blades with serrated teeth,this study employed BAg5CuZnNiMnIn alloy as the brazing filler material.Through high-frequency induction brazing technology,a reliable connection was achieved between YG6X cemented carbide(saw blade tooth tip)and 65Mn steel(saw blade body).Microstructure and element distribution of the braced joint were characterized using optical microscopy(OM),scanning electron microscopy(SEM),and energy dispersive spectroscopy(EDS).Shear strength tests investigated the effects of weld width and induction tempering temperature on the mechanical properties of the joint.Results indicate:The braced joint formed a stable metallurgical bond with no visible cracks,though partial porosity existed within the weld.It exhibited a"65Mn steel-weld-YG6X cemented carbide"structural characteristic;Fe,Cu,Co,and other elements exhibited mutual diffusion at the interface;weld width significantly influenced joint strength,with shear strength increasing by approximately 27.2％when width decreased from 20μm to 8μm;Induction tempering temperature modulates joint shear strength,with the optimal shear strength(161.3MPa)achieved at 400 ℃ tempering-an about 20MPa increase over the untempered specimen.At tempering temperatures of 500℃ and above,shear strength was lower than that of the untempered specimen.