| 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],51(3):271-277 |
| Effect of High Temperature Carburizing on High Temperature Mechanical Properties and Dry Cutting Performance of Carbide Coated Tools |
| Received:May 21, 2021 Revised:August 29, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.03.029 |
| KeyWord:tool coating carburization of cemented carbide mechanical properties cutting performance |
| Author | Institution |
| TAN Jun-guo |
School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou , China |
| LI Ji-fei |
School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou , China |
| YE Pu-sheng |
School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou , China |
| ZHANG Teng-fei |
School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou , China |
| WANG Qi-min |
School of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou , China |
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| Abstract: |
| 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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