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Effect of Cr Addition on Tribological Properties of Ni3Si Alloys |
Muye NIU1,2, Xinghua ZHANG1,2( ), Haicheng ZHAO1, Yu XIA1, Jiajie LIU1 |
1 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China 2 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
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Cite this article:
Muye NIU, Xinghua ZHANG, Haicheng ZHAO, Yu XIA, Jiajie LIU. Effect of Cr Addition on Tribological Properties of Ni3Si Alloys. Chinese Journal of Materials Research, 2018, 32(5): 395-400.
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Abstract Ni3Si alloys were microalloyed via arc melting with small amounts of Cr and B for improving their mechanical properties. The microstructure, phase composition and tribological property of Ni3Si alloys were investigated. Results show that Ni3Si alloy was mainly composed of β1-Ni3Si and γ-Ni31Si12 phases; with the increasing Cr-conten the phase composition was changed to γ-Ni31Si12 and α-Ni, and then changed to γ-Ni31Si12 and Cr3Ni5Si2; the microhardness increased along with the increasing Cr-content; during the dry sliding friction the friction coefficients of the alloys were about 0.5 and their wear rates were much lower than that of 316 stainless steel. The optimum addition of Cr for the best tribological property of the Ni3Si alloy was 5% Cr (in mass fraction). With the increasing load the wear mechanisms of Ni3Si alloys with 0% and 5% Cr exhibited significant change from abrasive wear to adhesive wear. The wear mechanisms of the alloys with 10% Cr were all the fatigue wear within the range of the test load.
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Received: 07 March 2017
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Fund: Supported by Natural Science Fund for Colleges and Universities in Jiangsu Province (No. 15KJB460007), National Natural Science Foundation of China (No. 51505199) and Natural Science Foundation of Jiangsu Province (No. BK20140511) |
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