Mo2C添加量对Ti(C,N)-Ni-Co金属陶瓷组织及其切削性能的影响

The Influence of Mo2C Addition on Microstructure and Cutting Performance of Ti(C,N)-Ni-Co Cermet

本文制备了不同Mo2C含量的Ti(C,N)-Ni-Co金属陶瓷,对比分析了其微观组织和机械性能以及对304不锈钢切削性能的影响。通过扫描电镜观察分析了微观组织的变化以及切削试验刀具后刀面磨损情况。利用阿基米德排水法、洛氏硬度计、维氏硬度压痕法、三点弯曲法分别测试了金属陶瓷的相对密度、硬度、断裂韧性以及横向断裂强度。结果显示,随着Mo2C含量的增加,金属陶瓷的晶粒度减小,当添加量(质量分数,下同)为18%时出现小晶粒团聚扎堆;硬度和密度增加;断裂韧性和横向断裂强度先增加后减小,在添加量为12%时达到最大值;当添加量为12%时,刀具后刀面磨损量在100 m/min和80 m/min的切削速度下均为最低。

In this paper, Ti(C,N)-Ni-Co cermets with different contents of Mo2 C were prepared, and the influence of Mo2 C on microstructure, mechanical properties and cutting performance of 304 stainless steel were studied. The microstructure and flank wear were observed through scanning electron microscope. Based on Archimedes drainage method,Rockwell hardness tester, Vikers hardness tester and three-point bending method, the relative density, hardness, fracture toughness and transverse rupture strength were tested. The results show that with the increase of the addition of Mo2 C, the grain size of the cermet decreases, and small grain agglomeration appears at 18%(mass fraction, the same as below) addition.Hardness and relative density increase with the increase of Mo2 C. Fracture toughness and transverse rupture increase firstly and then decrease, reaching the maximum at 12% addition. The flank wear of the cutting tool is the lowest under the cutting speed of 100 m/min and 80 m/min,when the addition of Mo2 C is 12%.