Effect of heat treatment on property of brazed joint

Qianzhong Jia, Hongtao Zhang, Man Li

COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(12D) 361-366

School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

Two different filler metal is used to join polycrystalline diamond (PCD) compact into a cemented carbide substrate. The effect of brazing holding technology on shearing strength and microstructure of brazing seam in hi-frequency induction brazing is investigated. Based on analyses of the microstructure of brazing joints by means of scanning electron microscope (SEM) and electron probe microanalyzer (EPMA), it is indicated that the shearing strength of brazing joints increased with the increase of heat preservation temperature; however, the shearing strength increased first and decreased afterward with the prolonging of heat preservation time. And the shearing strength of PCD cutting tools using the way of post-weld heat preservation is higher than that of those using plaster power cooling or air cooling. Thermal damage happened on the PCD cutting tools, and the damage became serious gradually with the increase of post-weld heat preservation time.