切削性能的影響
(1. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 株洲鉆石切削刀具股份有限公司，株洲 412000)
摘 要: 研究基體梯度結(jié)構(gòu)對(duì)TiN涂層硬質(zhì)合金力學(xué)和切削性能的影響；采用陰極弧蒸發(fā)涂層工藝分別在均質(zhì)和梯度硬質(zhì)合金基體上制備TiN涂層；運(yùn)用金相觀察、掃描電鏡分析、三點(diǎn)抗彎強(qiáng)度測(cè)試、顯微硬度測(cè)試和切削性能測(cè)試，研究基體梯度結(jié)構(gòu)對(duì)TiN涂層硬質(zhì)合金組織結(jié)構(gòu)、力學(xué)性能和切削性能的影響。結(jié)果表明：基體結(jié)構(gòu)梯度化后，TiN涂層表面形貌由平整狀變?yōu)榫W(wǎng)狀結(jié)構(gòu)，顯微硬度提高19%，抗彎強(qiáng)度提高6.1%；基體結(jié)構(gòu)梯度化后，涂層硬質(zhì)合金的結(jié)構(gòu)發(fā)生變化、力學(xué)性能得到提高，涂層刀片的抗沖擊性能和切削性能分別提高10%和15%左右。
關(guān)鍵字: TiN涂層硬質(zhì)合金；梯度結(jié)構(gòu)；力學(xué)性能；顯微組織；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
