( 1. 三峡大学 机械与材料学院， 宜昌 443002；
2. 南京航空航天大学 材料科学与技术学院， 南京 210016；
3. 华中科技大学 塑性成形模拟及模具技术国家重点实验室，
武汉 470074)
摘 要: 利用真空烧结工艺和表面氮化处理工艺制备纳米复合Ti(C, N)基金属陶瓷可转位刀片和功能梯度可转位刀片， 并对刀片的切削性能进行分析。 结果表明： 切削正火态45＃钢、 淬火态45＃钢和奥氏体不锈钢时， 与YT15、 YG8、 TN20相比， 制备的刀具皆表现出较优的切削性能和较高的耐磨性， 表面经氮化处理后， 刀具的表面硬度提高了HRA2.2， 大幅度提高了刀具的抗热冲击性能。 具有梯度结构的金属陶瓷刀片切削正火钢、 铸铁和不锈钢时的切削性能比无梯度结构金属陶瓷刀片的切削性能优良， 具有更高的耐磨性。
关键字: Ti(C, N)基金属陶瓷； 功能梯度可转位刀片； 切削性能； 耐磨性
Ti(C, N)-based cermet tools
（ 1. College of Mechanical and Material Engineering, China Three Gorges University, Yichang 443002, China;
2. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. Sate Key Laboratory of Plastic Forming Simulation and Die and
Mould Technology, Huazhong University of Science and Technology,
Wuhan 430074, China）
Abstract: The nano-composite Ti(C, N)-based cermet indexable tools and functionally gradient Ti(C, N)-based cermet indexable tools were prepared by vacuum sintering process and surface heat-treatment process with hot isostatic pressing (HIP) in nitrogen, respectively, and the newly fabricated cermet cutting tools were tested by continuous turning. The results show that, comparing to the cemented carbide YT15, YG8 and cermet TN20, the newly fabricated cermet tools exhibit better performance and higher wear resistance during cutting the normalized medium carbon steel, quenched medium carbon steel and austenite stainless steel. The surface hardness of the post-treated cermets increases, and the thermal shock resistance is substantially improved. The cutting property of the cermet tools with gradient structure is much better than that without gradient structure.
Key words: nano-composite Ti(C, N)-based cermet; functionally gradient indexable insert; cutting performance; wear resistance
