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Home > Archive>Volume 50, Issue 7, 2021 >2281-2287. DOI:10.12442/j.issn.1002-185X.E20200032
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Effect of Laser Clad Ni60A Coating on High Temperature Dry Sliding Friction and Wear Characteristics of 20CrNiMo Steel
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School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China

Fund Project:

National Natural Science Foundation of China (51801076); Natural Science Research of Jiangsu Higher Education Institutions of China (18KJB430009); Jiangsu Province Postdoctoral Science Foundation (1601055C); Senior Talents Research Startup of Jiangsu University (14JDG126)

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    Abstract:

    To improve the wear resistance of brake disks, the Ni60A coating was prepared on 20CrNiMo steel using laser cladding by optical fiber-based laser system. The microstructure, composition uniformity, hardness, dry-sliding wear performance, and friction and wear mechanism of the Ni-based alloy coating were investigated. The results show that the coating consists of γ-Ni, M23C6, Ni-Cr-Fe, Ni3B, [Fe, Ni], FeNi3, NiC, FeNi, and other phases. The average microhardness HV0.3 of Ni-based alloy coating is 4600 MPa, which is 2.63 times higher than that of the 20CrNiMo steel substrate. Compared with the substrate, the coating exhibits lower average friction coefficients under working condition of high load and high temperature, and the wear resistance significantly improves. When the load is 150 N, the wear resistance of the coating increases by 15.3 and 22.0 times at room temperature and 400 °C, respectively. With the increase of temperature and load, the wear mechanism of the coating changes from abrasive and adhesive wear to oxidative and abrasive wear.

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[Liu Guanglei, Cao Yuhao, Ji Sibo, Yu Hui, Jiang Wenneng, Li Maojun, Si Naichao. Effect of Laser Clad Ni60A Coating on High Temperature Dry Sliding Friction and Wear Characteristics of 20CrNiMo Steel[J]. Rare Metal Materials and Engineering,2021,50(7):2281~2287.]
DOI：10.12442/j. issn.1002-185X. E20200032

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History
  • Received:July 22,2020
  • Revised:September 17,2020
  • Adopted:October 23,2020
  • Online: August 09,2021
  • Published: July 31,2021

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