The decomposition phenomena of WC particle at different heating conditions was analyzed

and microstructure of WC particles was observed with the help of OM （optical microscope） and SEM （scanning electron microscope） by analyzing decomposition behavior

and a decomposition mechanism of cast WC particle decomposition was presented. Through observing decomposition process of WC particles under different heating conditions

the decomposition mechanism of WC particle was described

and the determined role of heating in decomposition process was approached. The results show that heating plays a decisive role in decomposition process of WC particles. However

the decomposition process of WC phase is different from W2C phase

where W2C phase is superior to WC phase in decomposition process. Different interface behavior between WC particle and the matrix can be observed at different heating conditions.