采用未预处理和经1 300 ℃保温1 h预处理的WC-10Co复合粉,通过低压烧结制备了WC-10Co超细晶硬质合金并制成刀具,并用该刀具对GH2132高温合金进行连续切削试验,研究了预处理对该刀具显微组织和使用寿命的影响,分析了其磨损机制.结果表明:预处理复合粉制得刀具的平均晶粒尺寸略大于未经预处理的,但使用寿命高于未经预处理的;随着切削速度的提高,两种刀具的使用寿命均下降,但复合粉预处理刀具的寿命下降幅度较小;黏接撕裂和剥落是两种刀具的主要磨损机制,预处理复合粉刀具中WC晶粒的大小和黏结相钴的分布较均匀,其抗磨损能力高于未经预处理的.
With un-pretreated and pretreated (heating at 1 300 ℃ for 1 h) 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.
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