金属热处理 ›› 2021, Vol. 46 ›› Issue (9): 223-228.DOI: 10.13251/j.issn.0254-6051.2021.09.040

• 表面工程 • 上一篇    下一篇

Cr12MoV钢表面激光熔覆Ni/Ni-WC梯度涂层的组织与耐磨性能

李礼1, 叶宏1,2, 刘越1, 佘红艳1, 屈威1, 沈大臣3, 陈梨3   

  1. 1.重庆理工大学 材料科学与工程学院, 重庆 400054;
    2.重庆市高校模具技术重点实验室, 重庆 400054;
    3.重庆建设工业(集团)有限责任公司, 重庆 400054
  • 收稿日期:2021-04-24 出版日期:2021-09-25 发布日期:2021-12-09
  • 通讯作者: 叶 宏,教授,硕士,E-mail:yehong@cqut.edu.cn
  • 作者简介:李 礼(1995—),男,硕士研究生,主要研究方向为表面工程,E-mail:370466182@qq.com。
  • 基金资助:
    重庆理工大学研究生创新基金(2018CLCY1013);重庆市大学生创新创业训练计划(2019CX001)

Microstructure and wear resistance of laser clad Ni/Ni-WC gradient coating on Cr12MoV steel

Li Li1, Ye Hong1,2, Liu Yue1, She Hongyan1, Qu Wei1, Shen Dachen3, Chen Li3   

  1. 1. School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;
    2. Chongqing University Key Laboratory of Mould Technology, Chongqing 400054, China;
    3. Chongqing Construction Industry (Group) Co., Ltd., Chongqing 400054, China
  • Received:2021-04-24 Online:2021-09-25 Published:2021-12-09

摘要: 利用脉冲Nd:YAG激光器在Cr12MoV模具钢表面熔覆了Ni/Ni-WC梯度涂层,通过X射线衍射仪、扫描电镜及能谱仪、高速往复摩擦磨损试验机以及白光干涉仪研究了梯度涂层的物相组成、耐磨性能和磨损形貌。结果表明:梯度涂层Ni60A+35%WC耐磨层物相主要由γ-(Ni, Fe)固溶体、WSi2相以及多种碳化物等硬质相组成。梯度涂层间以及涂层与基体间没有裂纹和气孔等缺陷生成,在界面处表现为良好的冶金结合。Ni60A+35%WC耐磨层平均显微硬度约为基体的1.7倍,Ni/Ni-WC耐磨涂层的磨损机理主要为疲劳磨损和磨粒磨损,基体的磨损机理主要为粘着磨损和磨粒磨损。

关键词: Cr12MoV钢, 激光熔覆, Ni/Ni-WC梯度涂层, 组织, 耐磨性能

Abstract: Ni/Ni-WC gradient coating was clad on the surface of the Cr12MoV die steel by using pulsed Nd:YAG laser, and the phase composition, wear resistance and wear morphology of the gradient coating were studied by X-ray diffractometer, scanning electron microscope and energy spectrometer, high-speed reciprocating friction and wear tester, and white light interferometer. The results show that the Ni60A+35%WC wear-resistant layer are mainly composed of γ-(Ni, Fe) solid solution, WSi2 phase and many kinds of carbides or hard phases. There are no defects such as cracks and pores between the gradient coating layers and between the coating and the substrate, showing good metallurgical bonding at the interfaces. The average microhardness of the Ni60A+35%WC wear-resistant layer of the gradient coating is about 1.7 times that of the substrate, and the wear mechanism of the Ni/Ni-WC wear-resistant coating is mainly fatigue wear and abrasive wear, while that of the substrate is mainly adhesive wear and abrasive wear.

Key words: Cr12MoV steel, laser cladding, Ni/Ni-WC gradient coating, microstructure, wear resistance

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