EFFECT OF THE COOLING RATE DURING MELT SOLIDIFICATION ON THE STRUCTURE AND PROPERTIES OF WC-W_2C

摘要

The paper examines the effect of cooling rate on the structure, phase composition, size of coherent scattering domains, and stress-strain state of relit commercially used to strengthen machine parts and mechanisms that perform under abrasive wear and high contact loads. Optical and scanning electron microscopy, quantitative X-ray diffraction, and electron microprobe analysis have been employed to reveal that higher cooling rates during melt solidification decrease the sizes of phase components in the 20 wt. % WC-80 wt. % W_2C alloy and increase compressive stresses in the W_2Cmatrix phase and tensile stresses in WC inclusions, improving the hardness of relit (by 1.5 times).