切削性能的影响
(1. 中南大学 粉末冶金国家重点实验室，长沙 410083；
2. 株洲钻石切削刀具股份有限公司，株洲 412000)
摘 要: 研究基体梯度结构对TiN涂层硬质合金力学和切削性能的影响；采用阴极弧蒸发涂层工艺分别在均质和梯度硬质合金基体上制备TiN涂层；运用金相观察、扫描电镜分析、三点抗弯强度测试、显微硬度测试和切削性能测试，研究基体梯度结构对TiN涂层硬质合金组织结构、力学性能和切削性能的影响。结果表明：基体结构梯度化后，TiN涂层表面形貌由平整状变为网状结构，显微硬度提高19%，抗弯强度提高6.1%；基体结构梯度化后，涂层硬质合金的结构发生变化、力学性能得到提高，涂层刀片的抗冲击性能和切削性能分别提高10%和15%左右。
关键字: TiN涂层硬质合金；梯度结构；力学性能；显微组织；切削性能
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Zhuzhou Cemented Carbide Cutting Tools Co. Ltd., Zhuzhou 412000, China）
Abstract:The effects of substrate gradient structure on the mechanical and cutting properties of TiN coated cemented carbide were studied. TiN coating was deposited on the homogeneous and gradient cemented carbide substrates by cathodic arc-evaporation. The effects of gradient structure on the microstructure, mechanical and cutting properties of TiN coated cemented carbides were investigated by optical microscopy, scanning electron microscopy, X-ray diffractometry, bending strength and micro-hardness measurements and cutting test. The results show that the surface morphology of TiN coated cemented carbides changes from flat to reticular structure after gradient of the substrate, the micro-hardness and bending strength increase by 19% and 6.1%, respectively. The structure and mechanical properties of TiN coated cemented carbide after gradient of the substrate change, which results into the impact resistance and cutting of TiN coated cemented carbide improved by 10% and 15%, respectively.
Key words: TiN coated cemented carbide; gradient structure; mechanical properties; microstructure; cutting properties
