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Home > Archive>Volume 48, Issue 5, 2019 >1544-1550. DOI:10.12442/j.issn.1002-185X.20171070
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Microstructure and Wear Resistance of Metal Matrix Composite Layer Fabricated by Simultaneous Powder-delivery Laser Melt Injection
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Affiliation:

1.School of Materials Science and Engineering, Huazhong University of Science and Technology;2.Heihe Xiangshan Hydropower Plant;3.School of Engineering Technology, Hubei University of Technology,;4.Harbin Heng Pu Laser Technology Co., Ltd.

Clc Number:

TG174.45

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    Abstract:

    Casting WC particles (WCp) were used as reinforced particle, 4Cr5MoSiV1 steel particles were used as metal matrixs, and Laser Melt Injection (LMI) was employed to produce WCp/4Cr5MoSiV1 metal matrix composite on Q235 steel. Microstructure of MMC layer was analyzed by X-ray diffraction (XRD), Optical microscopy (OM) and scanning electron microscopy (SEM), microhardness was tested along the depth direction of the coatings, pin-on-disk wear test was conducted at room temperature, and morphologies of worn surfaces was analyzed by SEM. Results show that the compound layer mainly comprises γ-Fe, WC, M2C, M6C, M23C7, (Fe,W)3C (M=(Fe, Cr, W, Mo), carbides exhibit different forms in the composite layer. The hardness of the compound layer is 723.74HV0.2, which is 4.6 times of the substrate and 50% higher than traditional hardened 4Cr5MoSiV1 steel. The average friction coefficient of MMC layer is 0.283, which is only 87.1% of the cemented carbide and 61.1% of the 4Cr5MoSiV1 steel. The relative wear rate is 43.45, which is 1.7 times of the cemented carbide and 43 times of the 4Cr5MoSiV1 steel.

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[wangtao, xuchong, luyuanyuan, zhanghang, caocongshuai, linshougang, liudejian. Microstructure and Wear Resistance of Metal Matrix Composite Layer Fabricated by Simultaneous Powder-delivery Laser Melt Injection[J]. Rare Metal Materials and Engineering,2019,48(5):1544~1550.]
DOI：10.12442/j. issn.1002-185X.20171070

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History
  • Received:November 26,2017
  • Revised:June 06,2018
  • Adopted:July 31,2018
  • Online: June 04,2019

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