Cemented Carbide Coated Tool Heat Treatment

Heat quantity cemented carbide coated tool because it is in an arc ion plating process, the substrate temperature between 200 ~ 400 ℃, due to the lower temperature, the coating material is deposited on the substrate surface is quenched, the coating material due to the thermal expansion coefficient differences have different heat shrinkage tendency, between the coating of each grain thus generating a thermal stress. The existence of thermal stress accelerates cemented carbide coated tool failure in mechanical cutting process. The heat can absorb part of the strain energy, easing the stress relaxation, coordination of the corresponding state change. Heat-treated steel base CVD-TiN coating, the coating after 1030 ℃ 250 ℃ after quenching and tempering, TiN coating microhardness increase, the crystal structure of the coating tends to be more complete, its lattice spacing and more TiN crystal plane close to the standard value of the pitch, while the density of the coating increased, and a good combination of strength of the matrix.