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原位NbC对激光熔覆Co基涂层组织和磨损性能的影响 被引量:12

Effect of in situ NbC on Microstructure and Wear Properties of Laser Cladding Co-Based Coatings
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摘要 针对42CrMo钢易发生磨损失效的问题,采用激光熔覆混合粉末(Co基粉、Nb粉和Cr3C2粉)在42CrMo钢表面成功制备了原位NbC颗粒增强复合涂层,分析了NbC含量对复合涂层微观结构、磨损行为以及NbC形态的影响。结果表明:当NbC的质量分数为0~15%时,涂层与基材的结合性能良好,涂层中没有明显的缺陷;当NbC的质量分数为20%时,涂层中出现了微裂纹;复合涂层的基体主要由ε-Co和γ-Co组成,强化相主要包括NbC、Cr23C6和Cr7C3;NbC颗粒的形成是通过溶解在熔池中的Nb原子和C原子以原位反应形成的;随着NbC含量增加,NbC的形态逐渐从四边形变为花瓣形,复合涂层的显微硬度和耐磨性明显增加,磨损形式主要是磨粒磨损和硬质相剥落磨损;当NbC的质量分数为10%时,涂层的显微硬度和耐磨性最佳,显微硬度和磨损速率分别为546.4 HV和0.020 g/min。 To solve the problem of wear failure of 42 CrMo steel and meet its application requirements, in situ NbC-particle-reinforced composite coatings were prepared on a 42 CrMo steel surface using laser cladding with a mixed powder(Co-based, Nb,and Cr3C2 powder). The effects of NbC content on the microstructure, wear behavior, and NbC morphology of the composite coatings were analyzed. The results show that when the mass fraction of NbC is 0--15%, the coating bonds well with the substrate and no obvious defects are observed in the coating. When the mass fraction of NbC reaches 20%, microcracks appear in the coating. The matrix of the composite coating primarily comprises ε-Co and γ-Co. The primary strengthening phases are NbC, Cr23C6, and Cr7C3. NbC particles are formed by the in-situ reaction of Nb and C atoms that are dissolved in the molten pool. With the increase of NbC content, the shape of the NbC particles gradually changes from quadrilateral to petaling. The microhardness and wear resistance of the composite coatings clearly increase, and the primary wear forms of the composite coatings are abrasive wear and hard-phase spalling wear. When the mass fraction of NbC is 10%, the microhardness and wear resistance of the coatings attain their maximal values of 546.4 HV and 0.020 g/min, respectively.
作者 易伟 陈辉 吴影 陈勇 Yi Wei;Chen Hui;Wu Ying;Chen Yong(School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)
出处 《中国激光》 EI CAS CSCD 北大核心 2020年第3期167-174,共8页 Chinese Journal of Lasers
基金 国家重点研发计划(2016YFB1100202)。
关键词 激光技术 激光熔覆 原位NbC 复合涂层 微观组织 摩损性能 laser technique laser cladding in-situ NbC composite coating microstructure wear behavior
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  • 1闫晓玲,董世运,徐滨士,闫世兴,王望龙.Fe901合金粉末激光熔覆层组织分布与缺陷产生机理分析[J].制造技术与机床,2013(12):115-118. 被引量:7
  • 2L. Dubourg, D. Ursescu, F. Hlawka, A. Cornet, Wear 258 (2005) 1745-1754.
  • 3K. Das, T.K. Bandyopadhyay, S. Das, j. Mater. Sci. 37 (2002) 3881-3892.
  • 4D.Q, Dai, G.Y. Liang, x.o, Tian, Hot Working Technol. 8 (2004) 19-51.
  • 5D. Ravnikar, N.B. Dahotre, j. Grum, Appl, Surf. Sci. 282 (2013) 914-922.
  • 6S. Yang, M.L. Zhong, W.j. Liu, Mater. Sci. Eng. A. 343 (2002) 71-78.
  • 7C. Guo, j. Chen, j.S. Zhou, Surf. Coat. Technol. 206 (2012) 2064-2071.
  • 8C.F. Wu, M,X. Ma, W.j. Liu, M.L. Zhong, Mater. Lett. 62 (2008) 3077-3080.
  • 9F.Y. Hung, Z.Y. Yan, L.H. Chen, Surf. Coat. Technol. 200 (2006) 6881-6887.
  • 10R. Colaco, R. Vilar, Wear 255 (2003) 643-650.

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