• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2021, Vol. 57 ›› Issue (12): 237-246.doi: 10.3901/JME.2021.12.237

• 材料科学与工程 • 上一篇    下一篇

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激光熔覆耐磨耐冲击复合涂层组织与性能研究

李云峰1,2, 石岩1,2   

  1. 1. 长春理工大学机电工程学院 长春 130022;
    2. 长春理工大学科技部光学国际科技合作基地 长春 130022
  • 收稿日期:2020-11-01 修回日期:2021-05-09 出版日期:2021-08-31 发布日期:2021-08-31
  • 通讯作者: 石岩(通信作者),男,1972年出生,博士,教授,博士研究生导师。主要研究方向为激光加工技术。E-mail:shiyan@cust.edu.cn
  • 作者简介:李云峰,男,1989年出生,博士研究生。主要研究方向为激光加工技术。E-mail:gyhu22@163.com
  • 基金资助:
    国家重点研发计划资助项目(2017YFB1104601)

Investigation on Microstructure and Performance of Wear-resistant and Impact-resistant Composite Coating Produced by Laser Cladding

LI Yunfeng1,2, SHI Yan1,2   

  1. 1. School of Electromechanical Engineering, Changchun University of Science and Technology, Changchun 130022;
    2. National Base of International Science and Technology Cooperation for Optics, Changchun University of Science and Technology, Changchun 130022
  • Received:2020-11-01 Revised:2021-05-09 Online:2021-08-31 Published:2021-08-31

摘要: 为提高大型主动轮齿圈齿面的耐磨与耐冲击性能,以齿圈所用ZG42CrMoA材料为研究对象,采用5 kW CO2激光器、四轴联动数控机床及载气式同轴送粉系统等设备在其表面激光熔覆制备夹层式与匀质复合涂层。利用扫描电镜、X射线衍射仪、显微硬度计及光学显微镜等分析、测试仪器对两种复合涂层进行微观组织表征。利用摩擦磨损试验机、夏比冲击试验机对高频感应淬火ZG42CrMoA、夹层式与匀质复合涂层进行磨损率、冲击韧性测试。结果表明,匀质复合涂层组织细化均匀且包含γ-Ni、Ni3B、M23C6、WC及W2C等物相。夹层包含γ-Ni、M23C6、NiMo及NiMo4等物相,其组织以等轴晶为主且出现Mo元素偏析并阻碍Cr元素析出。夹层式与匀质复合涂层磨损率较基材与高频淬火试样分别降低64.71%和56.84%。夹层式复合涂层冲击韧性较匀质复合涂层与高频淬火试样分别提高8.21%和14.67%,并达到基材的65.37%。通过数值模拟可知,夹层能显著缓解复合涂层的应力集中,表明其能有效提高复合涂层的耐冲击性能。

关键词: 激光熔覆, ZG42CrMoA, 复合涂层, 微观组织, 耐磨性, 耐冲击性

Abstract: In order to improve the wear and impact resistance of the large driving wheel gear ring, the ZG42CrMoA was used in gear ring as the object of study. The 5 kW CO2 laser, four-axis CNC machines and the coaxial powder feeding system were used to produce the sandwich and homogeneous composite coating by laser cladding on the surface of ZG42CrMoA. The microstructure was characterized by using optical microscopy, SEM, XRD and microhardness tester. The friction and wear tester and charpy impact tester were used to test the wear rate and impact toughness of high frequency induction hardened ZG42CrMoA, sandwich and homogeneous composite coating. The results show that the homogeneous composite coating has a uniform structure and contains γ-Ni, Ni3B, M23C6, WC and W2C phases. The interlayer contains γ-Ni, M23C6, NiMo and NiMo4 phases. Microstructure of interlayer mainly includes equiaxed crystals. The segregation of Mo prevents the precipitation of Cr. The wear rate of the sandwich and homogeneous composite coating are 64.71% and 56.84% lower than that of the substrate and the high-frequency quenched sample. The impact toughness of the sandwich composite coating are 8.21% and 14.67% higher than that of the homogeneous composite coating and the high-frequency quenched sample, and reaches 65.37% of the substrate. Numerical simulation shows that the interlayer can more effectively relieve the stress concentration of the composite coating. The above shows that the interlayer can effectively improve the impact resistance of the composite coating.

Key words: laser cladding, ZG42CrMoA, composite coating, microstructure, wear resistance, impact resistance

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