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首页> 外文期刊>Applied Surface Science >Microstructure and wear resistance of composite layers on a ductile iron with multicarbide by laser surface alloying
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Microstructure and wear resistance of composite layers on a ductile iron with multicarbide by laser surface alloying

机译：球墨铸铁与多碳化物复合层的激光表面合金化组织和耐磨性

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摘要

Multicarbide reinforced metal matrix composite (MMC) layers on a ductile iron (QT600-3) were fabricated by laser surface alloying (LSA) using two types of laser: a 5 kW continuous wave (CW) CO_2 laser and a 400 W pulsed Nd:YAG laser, respectively. The research indicated that LSA of the ductile iron with multicarbide reinforced MMC layers demonstrates sound alloying layers free of cracks and porosities. The microstructure, phase structure and wear properties of MMC layers were investigated by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD), as well as dry sliding wear testing. The microstructure of the alloyed layer is composed of pre-eutectic austenite, ledeburite, spherical TiC, Cr_7C_3 and Cr_(23)C_6 with various morphologies. TiC particles are dispersed uniformly in the upper region of MMC layers. The average hardness of LSA layers by CO_2 laser and pulsed Nd:YAG laser is 859 HV_(0.2) and 727 HV_(0.2), respectively. The dry sliding wear testing shows the wear resistance of ductile iron is significantly improved after LSA with multicarbide.
机译：球墨铸铁（QT600-3）上的多碳化物增强金属基复合材料（MMC）层是使用两种类型的激光通过激光表面合金化（LSA）制成的：5 kW连续波（CW）CO_2激光和400 W脉冲Nd： YAG激光。研究表明，具有多碳化物增强MMC层的球墨铸铁的LSA显示出无裂纹和气孔的良好合金层。通过扫描电子显微镜（SEM），透射电子显微镜（TEM）和X射线衍射（XRD）以及干滑动磨损测试，研究了MMC层的微观结构，相结构和磨损性能。合金层的微观结构由前共晶奥氏体，莱氏体，球形TiC，Cr_7C_3和Cr_（23）C_6组成。 TiC颗粒均匀地分散在MMC层的上部区域。 CO_2激光和Nd：YAG脉冲激光对LSA层的平均硬度分别为859 HV_（0.2）和727 HV_（0.2）。干滑动磨损测试表明，LSA与多碳化物相比，球墨铸铁的耐磨性得到了显着改善。

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  • 来源
    《Applied Surface Science》 |2010年第23期|P.7001-7009|共9页
  • 作者

    Hua Yan; Aihua Wang; Zhaoting Xiong; Kaidong Xu; Zaowen Huang;

  • 作者单位

    State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    rnState Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    rnState Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China School of Mechanical and Manufacturing Engineering, Loughborough University, Leicestershire, LE11 3TU, UK;

    rnState Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    rnState Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    laser surface alloying; MMC layers; multicarbide; microstructure; wear resistance;

    机译：激光表面合金化;MMC层;多碳化物微观结构耐磨性;

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