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Summary
The aim was to improve the friction weldability of cemented carbide alloy to tool steel. A tool steel was friction welded to a cemented carbide alloy with an intermediate layer which was dispersion strengthened by tungsten carbide particles with nickel as a matrix. The joint tensile strength was more than 730 MPa where the forge pressure was less than 250 MPa but markedly decreased when the forge pressure was more than 300 MPa. Every joint fractured in the intermediate layer, in the vicinity of the weld interface. When the forge pressure was more than 300 MPa, a number of minute cracks were noted in the intermediate layer. It is inferred that this cracking was caused by the difference in deformation rates of the nickel matrix and the tungsten carbide particles due to the compressive stress during the application of the forge pressure. One of the causes for the deterioration in joint tensile strength with increasing forge pressure is thought to be the cracks formed in the intermediate layer.