谭君国,李季飞,叶谱生,张腾飞,王启民.高温渗碳对硬质合金涂层刀具高温力学性能及干式切削性能的影响[J].表面技术,2022,51(3):271-277.
TAN Jun-guo,LI Ji-fei,YE Pu-sheng,ZHANG Teng-fei,WANG Qi-min.Effect of High Temperature Carburizing on High Temperature Mechanical Properties and Dry Cutting Performance of Carbide Coated Tools[J].Surface Technology,2022,51(3):271-277 |
| 高温渗碳对硬质合金涂层刀具高温力学性能及干式切削性能的影响 |
| Effect of High Temperature Carburizing on High Temperature Mechanical Properties and Dry Cutting Performance of Carbide Coated Tools |
| 投稿时间：2021-05-21 修订日期：2021-08-29 |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.03.029 |
| 中文关键词: 刀具涂层 硬质合金渗碳 力学性能 切削性能 |
| 英文关键词:tool coating carburization of cemented carbide mechanical properties cutting performance |
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| Author | Institution |
| TAN Jun-guo | School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou 510006, China |
| LI Ji-fei | School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou 510006, China |
| YE Pu-sheng | School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou 510006, China |
| ZHANG Teng-fei | School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou 510006, China |
| WANG Qi-min | School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou 510006, China |
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| 中文摘要: |
| 目的 探究硬质合金基体渗碳处理对涂层刀具高温元素扩散、高温力学性能和切削性能的影响。方法 通过高温渗碳和PVD方法制备了渗碳涂层刀具。采用SEM观察渗碳前后基体的表面形貌。采用维氏硬度计表征渗碳硬质合金基体截面的硬度分布。采用EDS对基体截面进行成分分析。采用XRD对涂层进行物相分析。利用纳米压痕仪对涂层高温退火硬度、弹性模量进行了表征。选用SKD-11冷作模具钢进行了干式切削实验。结果 经过渗碳处理后，硬质合金车刀基体形成了表面层贫Co、近表面层富Co的梯度结构，在距基体表面0~900 μm的深度范围内，基体硬度呈现梯度变化。高温下，在均质硬质合金基体上沉积的涂层中检测到Co元素，而渗碳硬质合金基体的涂层中未检测到明显的Co元素。在沉积态、800 ℃真空退火和1100 ℃真空退火3种条件下，渗碳涂层车刀的硬度(分别为33、32、22.5 GPa)均高于均质硬质合金涂层车刀(分别为31、30、18.5 GPa)。均质硬质合金裸刀的车削长度为~80 m时达到磨钝标准，渗碳涂层车刀的车削长度为~1100 m时达到磨钝标准。结论 渗碳处理显著抑制了硬质合金基体中的Co在高温下向涂层内部扩散，增强了涂层高温稳定性，使得涂层在高温下仍能维持较高的力学性能，同时显著改善了涂层刀具的干式车削寿命。 |
| 英文摘要: |
| This paper aims to investigate the effect of carburizing treatment of cemented carbide substrates on the high-temperature element diffusion, high-temperature mechanical properties and cutting performance of coating tools, carburized and coated tools were prepared by high temperature carburizing and PVD method. SEM was used to observe the surface morphology of the substrate before and after carburizing, Vickers hardness and EDS was used to characterize the hardness distribution and composition of the substrate cross-section of the carburized cemented carbide, respectively. XRD was used to analyze the phase of the coating. The coating hardness and elastic modulus of the coating annealed at high temperature were characterized by nano-indentation, and the dry cutting experiments were carried out with SKD-11 cold work die steel. The experimental results show that, after carburizing treatment, the cemented carbide turning tool substrate formed a gradient structure of Co-poor top-surface layer and Co-rich near-surface layer, in the depth range of 0~900 μm from the substrate surface, the hardness of the substrate changed in a gradient. At high temperatures, Co element was detected in the coating of homogeneous cemented carbide substrate, but no obvious Co element was detected in the coating deposited on carburized cemented carbide substrate. The hardness of carburized turning tool (33 GPa, 32 GPa and 22.5 GPa, respectively) was higher than that of the homogeneous carbide-coated turning tool (31 GPa, 30 GPa and 18.5 GPa, respectively) at the deposition state, 800 ℃ and 1100 ℃. When the length of turning was ~80 m, the uniform carbide bare tool reached the blunt standard, and the carburized coating turning tool reached the blunt standard at ~1100 m. In conclusion, the carburizing treatment significantly inhibited the diffusion of Co in the cemented carbide substrate into the coating at high temperature, enhanced the coating stability at high temperature, made the coating still maintain high mechanical properties at high temperature, and significantly improved the dry turning life of the coated tool. |
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