Mechanical properties and microstructural evolution of WC-binderless and WC-Co hard materials by the heat treatment process

摘要: Abstract In this study, the heat treatment process was performed to improve mechanical properties of WC-binderless and WC-Co hard materials pre-fabricated by PCAS process. The microstructural were varied significantly with time. To increase fracture toughness value, heat-treatment WC-binderless, WC-5 wt.% Co WC-10 wt% at (1,300, 1,150, 950) °C under (5 48) h, respectively. Enhancement that focused on major reasons estimated for four mechanisms. Firstly, microstructure formation a mechanism investigated demonstrate grain coarsening behavior variation Secondly, fraction coherent interface WC/Co existing in specific plane orientation investigated. particular, texture distribution WC (0001)hcp (111)fcc discussed EBSD micrograph. Thirdly, mean free path content exhibited relation properties. Finally, decarburization effect WC, which occurs during condition demonstrated XRD peaks FE-SEM analysis. chemical reaction, separated W phases locally precipitated, resulting an toughness.