Abstract:
With un-pretreated and pretreated (heating at 1300℃ for 1h) WC-10Co powder, WC-10Co ultrafine cemented carbides were prepared by means of direct low pressure sintering and then were manufactured into cutting tools. Then the continuous cutting experiments were conducted on GH2132 superalloy by the cutting tools. The effects of the pretreatment on the microstructure and service life of the cutting tool were studied and the wear mechanism was analyzed. The results show that the average grain size of the cutting tool manufactured with pretreated composite powder was slightly larger while the service life was longer than that with un-pretreated powder. With the increase of cutting speed, the service life of the two cutting tools both decreased, but the life decreasing range of the cutting tool made from pretreated composite powder was relatively small. The adhesive wear and spalling wear were two main wear mechanisms for the two cutting tools. The distributions of WC grain size and of the adhesive phase Co in the cutting tool made from pretreated powder was uniform, resulting in the higher wear resistance than that with un-pretreated powder.