超细晶粒Ti(C,N)基金属陶瓷刀具的磨损性能研究  

Research on the Cutting Properties of Ultra-fine Ti(C,N) Based Cermet Cutters

作　　者：许育东[1] 刘宁[1] 石敏[1] 晁晟[1] 杨海东[1] 谢峰[1] 

机构地区：[1]合肥工业大学,合肥230009

出　　处：《中国机械工程》2006年第21期2300-2304,共5页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50072003);安徽省自然科学基金资助项目(03044902);合肥工业大学科研发展基金资助项目(030301F)

摘　　要：研究了两种超细晶粒纳米改性Ti（C，N）基金属陶瓷刀具——44Ti（C，N）-5TiN（nm）-15WC-16M02C-20Ni（刀具A）和39Ti（C，N）-10TiN（nm）-15WC-16M02C-20Ni（刀具B）在加工正火态中碳钢时的切削性能和磨损机理。研究表明，两种刀具材料的显微组织都由金属相与陶瓷相组成，其中粗大的陶瓷相呈典型的芯／壳结构，陶瓷相晶粒尺寸为400～800nm。切削实验表明，刀具A的切削性能要优于刀具B，刀具A常以后刀面正常磨损的方式失效，刀具B则常以破损崩刃的方式失效。能谱（EDS）分析表明，高速切削时金属陶瓷刀具主要的磨损机制是扩散磨损和氧化磨损。The cutting properties and wear mechanism of two ultra--fine cermet cutters, tool A （nano--TiN modified Ti（C,N） based cermet cutter, 44Ti（C,N）-- 5TiN（nm）--ISWC--16Mo2C-- 20Ni） and toolB （nano--TiN modified Ti（C,N） based cermet cutter, 39Ti（C,N）--10TiN（nm）-- 15WC--16Mo2C--20Ni） were studied for cutting normalized medium steels. Results show that the microstructure of the tested tools still consists of ceramic phases and metallic phases and the coarser ceramic phases exhibit a typical core/rim structure and the grain size of the ceramic phases is about 400nm-800nm. In general, the cutting performance of tool A is superior to that of toolB. Scanning electron microscopy （SEM） analysis of the worn surfaces of the tested cutters shows that tool A readily fails in the form of flank wear whereas tool B mostly fails in the from of breakage. Energy dispersive X--ray spectroscopy （EDS） of the worn surfaces shows that diffusion wear and oxidation wear are the main wear mechanism when cutting at high speed.

关 键 词：超细晶粒 金属陶瓷 刀具 切削性能 磨损机理 

分 类 号：TG71[金属学及工艺—刀具与模具] TF125.31[冶金工程—粉末冶金]