车用不锈钢表面激光熔覆CoCrFeNi-NbC复合涂层的组织及耐磨性
Investigation of microstructure and wear characteristics of laser-cladded CoCrFeNi-NbC composite coatings for automotive stainless steel applications
杨金玉 1刘军 2徐晓冰3
作者信息
- 1. 长春汽车职业技术大学,吉林长春 130013
- 2. 纬湃汽车电子(长春)有限公司,吉林长春 130013
- 3. 合肥工业大学电气工程学院,安徽 合肥 230009
- 折叠
摘要
采用激光熔覆技术在汽车用304钢表面成功制备了 CoCrFeNi-10％NbC高熵合金涂层,并研究了10％NbC颗粒对涂层微观组织及性能的影响.结果表明:CoCrFeNi-NbC高熵合金复合涂层无裂纹、气孔等缺陷,NbC在涂层中分布均匀.复合涂层由FCC相和NbC相组成.复合涂层的显微硬度为(573±6.9)HV,约为CoCrFeNi涂层的1.8倍.复合涂层的强化机制为固溶强化和第二相弥散强化.CoCrFeNi-NbC复合涂层的摩擦因数和磨损率均优于CoCrFeNi涂层,复合涂层的平均摩擦因数为0.487,磨损率为1.95×105 mm3/(N·m).添加NbC可显著提升CoCrFeNi涂层的硬度和耐磨性.
Abstract
CoCrFeNi-NbC high entropy alloy composite coating was prepared on 304 stainless steel surface by laser cladding technology.The effect of NbC on the microstructure and wear resistance of CoCrFeNi high entro-py alloy coating was studied.The results show that the CoCrFeNi-NbC high entropy alloy composite coating has no cracks,pores and other defects,and the distribution of NbC in the coating is uniform.The composite coating is composed of FCC phase and NbC phase.The microhardness of the composite coating is(573±6.9)HV,about 1.8 times that of the CoCrFeNi coating.The composite coating is strengthened through solid solution mecha-nisms and the dispersion of secondary phases.The friction coefficient and wear rate of CoCrFeNi composite coating are better than those of CoCrFeNi coating.The average friction coefficient and wear rate of CoCrFeNi-NbC composite coating are 0.487 and 1.95×10-5 mm3/(N·m).The addition of NbC significantly improves the hardness and wear resistance of the CoCrFeNi coating.
关键词
高熵合金/激光熔覆/耐磨性/NbC/显微硬度Key words
high-entropy alloy/laser cladding/wear resistance/NbC/microhardness引用本文复制引用
出版年
2024
NETL
NSTL
万方数据