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| Effect of Post-diffusion Treatment on Microstructure and Properties of Plasma Nitriding 7Cr7Mo2V2Si Cold Work Mold Steel |
YU Xingfu1( ), XI Keyu1, ZHANG Hongwei2, WANG Quanzhen3, HAO Tianci1, ZHENG Dongyue1, SU Yong4 |
1.School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China
2.Northeast Air Traffic Administration Meteorological Center of Civil Aviation, Shenyang 110169, China
3.Shengu Group Co. Ltd., Shenyang 110869, China
4.School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China |
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Cite this article:
YU Xingfu, XI Keyu, ZHANG Hongwei, WANG Quanzhen, HAO Tianci, ZHENG Dongyue, SU Yong. Effect of Post-diffusion Treatment on Microstructure and Properties of Plasma Nitriding 7Cr7Mo2V2Si Cold Work Mold Steel. Chinese Journal of Materials Research, 2025, 39(3): 225-232.
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Abstract Surface modification treatment of 7Cr7Mo2V2Si steel was conducted by using plasma nitriding, and the effect of post diffusion treatment on its microstructure, hardness, and friction and wear properties was investigated. The results showed that the nitriding layer on 7Cr7Mo2V2Si steel generated by plasma nitriding at 520 oC of about 186 μm in thickness, presented a microstructure with abundant vein-like network along grain boundaries. After diffusion treatment at 550 oC, the microstructure of vein-like network in the nitriding layer was gradually shrinked or disappeared, while the thickness of nitriding layer increased. The thickness of the nitriding layer was increased by 15.59%, 24.73% and 36.02% respectively, corresponding to the post diffusion time for 10 h, 20 h and 30 h. After post-diffusion treatment, tempered martensite was formed in the steel, which prevents significantly grain slip and plastic deformation, and improves the strength and toughness of the steel. The average hardness of the bare steel was 674.8HV, while the highest hardness of 1276.4HV was for the nitriding layer. Plasma nitriding can significantly improve the wear resistance of 7Cr7Mo2V2Si steel. A large number of plowing grooves and spalling pits appeared on the wear surface of the steel without nitriding treatment, while after plasma nitriding treatment, the wear degree is reduced, the plowing grooves became shallower, and the spalling pits also reduced. Compared with the bare 7Cr7Mo2V2Si steel, the wear loss amount was reduced by 59.48% for the steel being plasma nitride at 520 oC, and the friction coefficient was reduced by 26.63%. After plasma nitriding and post diffusion treatment for different time, the hardness of 7Cr7Mo2V2Si steel was decreased. Compared to the as nitriding steel, the maximum surface hardness decreased from 1276.4HV to 881.5HV for the steel subjected to plasma nitriding plus post diffusion treatment for 30 h, and the average friction coefficient and the wear loss amount decreased from 0.4731 and 4.7 mg to 0.5939 and 9.3 mg respectively.
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Received: 12 June 2024
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| Fund: Liaoning Provincial Department of Education Project(JYTMS20231194) |
Corresponding Authors:
YU Xingfu, Tel: 13604072060, E-mail: yuxingfu@163.com
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