Effect of Pre-treatment on Structure and Properties of Chromium-vanadium Penetrating Layer on Pre-carbided 20 Steel by Molten-salt Bath Technique
Author(s): ZHANG Jin, WU Sibo, WANG Haoyu, LI Chengyang, XIANG Jun, SUN Caiyuan, School of Materials Science and Engineering, Southwest Petroleum University
Pages: 120-123
Year: 2016 Issue: 14
Journal: Hot Working Technology
Keyword: V and Cr penetrating layer; molten-salt bath; friction and wear property;
Abstract: A duplex surface treatment on 20 steel matrix was developed by involving carbonizing and molten-salt bath technique. The process was performed in molted-salt bath at 950℃ for 4 h. The compositions of vanadium carbide, chromium carbide and chromium-vanadium carbide layer were studied. The dry wear tests were carried out on ball-on-disk configuration.The results indicate that the prepared chromium-vanadium layers exhibit compact morphology. The thickness of the layer is about 12 μm,which is composed of V4C2.67, Cr7C3 and Cr23C6 phases. The hardness of chromium carbide, vanadium carbide and chromium-vanadium carbide layer is 1740HV0.03, 2004HV0.03 and 1885HV0.03, respectively. The wear coefficient of chromium- vanadium carbide layer is minimum, which is about 0.3066, then the anti-friction property is the best.
Pages: 120-123
Year: 2016 Issue: 14
Journal: Hot Working Technology
Keyword: V and Cr penetrating layer; molten-salt bath; friction and wear property;
Abstract: A duplex surface treatment on 20 steel matrix was developed by involving carbonizing and molten-salt bath technique. The process was performed in molted-salt bath at 950℃ for 4 h. The compositions of vanadium carbide, chromium carbide and chromium-vanadium carbide layer were studied. The dry wear tests were carried out on ball-on-disk configuration.The results indicate that the prepared chromium-vanadium layers exhibit compact morphology. The thickness of the layer is about 12 μm,which is composed of V4C2.67, Cr7C3 and Cr23C6 phases. The hardness of chromium carbide, vanadium carbide and chromium-vanadium carbide layer is 1740HV0.03, 2004HV0.03 and 1885HV0.03, respectively. The wear coefficient of chromium- vanadium carbide layer is minimum, which is about 0.3066, then the anti-friction property is the best.
Related Articles