Characterization and stress relaxation of the functionally graded WC–Co/Ni component/stainless steel joint

The present investigation was conducted to research the brazing between a functionally graded WC–Co/Ni component and 410 stainless steel with Cu–Zn filler alloy. In the joint, γ phase was suppressed due to isothermal solidification and (Cu,Ni)-based solid solution was formed between the braze and Ni layer, which contributed to the intimate bonding of the WC–Co/Ni component and stainless steel. The functionally graded WC–Co/Ni component was beneficial to relaxing stresses and improving the strength of the cemented carbide/stainless steel joints.

► The functionally graded WC–Co/Ni component and 410 stainless steel were successfully brazed.
► The γ phase was suppressed in the joint due to isothermal solidification.
► (Cu,Ni)-based solid solution was formed between the braze and Ni layer.
► The functionally graded WC–Co/Ni component was beneficial to relaxing stresses.