WC-Ni超硬合金の焼結残留応力

概要

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Cemented carbide alloy is widely used for high strength and hardness. The tips of cemented carbide alloy are sintered from the WC powder and often brazed on the wide sliding surface. Although welding is better than brazing, the welding crack occurs sometimes because the cemented carbide alloy has low contents of the bonding metal. Functionally gradient composite material will be expected to improve the weldability. One of the factors of the crack is the residual stress existed in the material. This paper describes an X-ray measurement method of both residual stress in WC and Ni phase of the cemented carbide alloy. Six kinds of specimen with bonding material Ni from 10% to 60% weight contents were made by spark plasma sintering (SPS) system. The stresses of the specimen were measured by X-ray diffractometer. As a result, the average residual stress between WC and Ni phase was approximately 500MPa in compression, while the stress was released considerably after annealing.
2005-01-25