• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

机械工程学报 ›› 2015, Vol. 51 ›› Issue (8): 37-43.doi: 10.3901/JME.2015.08.037

• 材料科学与工程 • 上一篇    下一篇

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KMN钢激光熔覆FeCr合金修复层组织性能及耐磨、耐蚀性研究

赵彦华1, 2, 孙杰1, 2, 李剑峰1, 2   

  1. 1. 山东大学机械工程学院 济南 250061;
    2. 山东大学高效洁净机械制造教育部重点实验室 济南 250061;
  • 出版日期:2015-04-15 发布日期:2015-04-15
  • 基金资助:
    国家重点基础研究发展计划(973计划，2011CB013403)和泰山学者建设工程资助项目

Research on Microstructure Properties and Wear and Corrosion Resistance of FeCr Repaired Coating on KMN Steel by Laser Cladding

ZHAO Yanhua1, 2, SUN Jie1, 2, LI Jianfeng1, 2   

  1. 1. School of Mechanical Engineering, Shandong University, Jinan 250061;
    2. Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, Shandong University, Jinan 250061
  • Online:2015-04-15 Published:2015-04-15

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摘要： KMN钢是大型离心式压缩机叶轮常用材料，服役过程中常出现磨损、腐蚀等损伤导致失效，激光熔覆技术是实现损伤叶轮修复再制造的有效手段。使用FeCr合金粉料通过激光熔覆技术在预置缺陷的KMN钢基体上制得修复层。通过扫描电镜(Scanning electron microscope, SEM)、能谱分析(Energy dispersive spectrometer, EDS)及X射线衍射(X-ray diffraction, XRD)对修复层微观组织、元素分布及物相组成进行观察分析；对激光熔覆修复层显微硬度进行测试；分别对修复层和KMN钢基体进行干摩擦滑动摩擦测试，观察并分析磨痕三维形貌；测得修复层及KMN钢基体的Tafel曲线，并使用Tafel直线外推法、失重法测试修复层与基体材料的腐蚀速度。结果表明，激光熔覆修复层与基体呈良好冶金结合、无气孔裂纹等缺陷；修复层硬度是基体材料的1.8倍；耐磨性、耐蚀性得到显著提升。

关键词: KMN钢, 激光熔覆, 耐磨性, 耐蚀性, 叶轮修复再制造

Abstract: KMN steel is a kind of high-strength low alloy steel which commonly used in large centrifugal compressor impeller. It is often failed in service process caused by wear, corrosion and other damage. Laser cladding is an effective means to remanufacture of failure impeller. Based on this, the FeCr alloy is deposited on KMN steel plate which had been preset defect by laser cladding. The microstructure, phase constitution, hardness and wear resistance of the clad layer are investigated by scanning electron microscope (SEM), energy dispersive spectroscopy(EDS), X-ray diffractometer, Vickers digital micro-hardness tester, sliding wear tester and optical profiler. The Tafel curves of repaired layer and KMN substrate are measured. The etching rate is analyzed for both of them. The results show that the recovered layer is free of cracks and has a good metallurgical bonding with substrate. The laser cladding repaired coating present a great hardness, excellent wear resistance and corrosion resistance.

Key words: corrosion resistance, impeller remanufacture, KMN steel, laser cladding, wear resistance

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