THE INFLUENCE OF THE METHOD OF PRODUCING THE MOLYBDENUM-DOPED WC-W₂ C EUTECTIC ALLOY ON ITS STRUCTURE AND PROPERTIES

Abstract

Scanning and transmission electron microscopy and X-ray diffraction show that the eutectic 5 wt.% Mo-doped WC–W₂С alloy produced in the Tammann furnace, by electron-beam melting, and by centrifugal sputtering changes its cooling rate in the melt crystallization process. This increases the size of the phase components by 2–2.5 times, decreases their amounts, and reduces the compressive stresses (in the W₂C matrix phase) and tensile stresses (in the WC, Mo₂C, and (W, Mo)₂C) inclusions) by two and more times. These changes result in 1.5 times higher hardness and 2 times higher strength of doped relit, which is widely used for surfacing machine parts and mechanisms operating in conditions of abrasive wear and high dynamic loads.