Abstract
The phase stress of the WC and Co phases in a WC-Co cemented carbide was determined by x-ray diffraction. The diffraction lines of WC (121) and Co (311) planes were measurcd with CoKα radiation. The surface of a specimen was sandblasted and polished with abrasive papers. The peak position of the diffraction line of the WC (121) plane which locates at a high diffraction angle of 164.17 deg was precisely determined by the Gaussian curve method. Various stresses were applied to the specimen to determine the stress constant K of the two phases. To determine the stress of the Co phase induced by an applied load, the stress constant was calculated theoretically from the elastic constants of a single crystal by using Kroner's model. The stress in the WC phase was determined from the stress in the Co phase using the equation of the equilibrium for microstresses. An extremely high compressive residual stress of 2 GPa was measured in the WC phase.
