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碳化硅增强钴基合金等离子喷焊层组织与力学性能

李明喜, 顾凤麟, 李殿凯

李明喜, 顾凤麟, 李殿凯. 碳化硅增强钴基合金等离子喷焊层组织与力学性能[J]. 焊接学报, 2015, 36(12): 35-38.
引用本文: 李明喜, 顾凤麟, 李殿凯. 碳化硅增强钴基合金等离子喷焊层组织与力学性能[J]. 焊接学报, 2015, 36(12): 35-38.
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LI Mingxi, GU Fenglin, LI Diankai. Microstructure and mechanic properties of SiC reinforced cobalt-based alloy coatings deposited by plasma transferred arc welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(12): 35-38.
Citation: LI Mingxi, GU Fenglin, LI Diankai. Microstructure and mechanic properties of SiC reinforced cobalt-based alloy coatings deposited by plasma transferred arc welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(12): 35-38.
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碳化硅增强钴基合金等离子喷焊层组织与力学性能

  • 安徽工业大学 材料科学与工程学院, 马鞍山 243002

基金项目: 国家自然科学基金资助项目(51445005);安徽省科技攻关资助项目(1501021069).

Microstructure and mechanic properties of SiC reinforced cobalt-based alloy coatings deposited by plasma transferred arc welding

  • School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China

摘要

    摘要
  • 摘要: 采用同步送粉方法在低碳钢表面制备质量分数分别为5%,10%和20%的SiC颗粒增强钴基合金喷焊层. 利用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)及能谱仪(EDS)分析涂层的显微组织特征和相结构,并对涂层进行显微硬度和纳米压痕试验. 结果表明,钴基合金喷焊层主要是由γ-Co固溶体、Cr23C6等物相构成. 加入不同含量的SiC粉末后喷焊层中出现(Cr,Fe)7C3,CoCx,Co3C和少量SiC相. SEM形貌显示钴基合金喷焊层为γ-Co和γ-Co+Cr23C6亚共晶组织,随着SiC含量的增加,喷焊层组织由亚共晶向共晶及过共晶转变. 涂层的显微硬度随SiC含量的增加而增加,显微硬度在加入20%SiC时为874 HV0.5. 纳米压痕试验显示熔合线附近固溶体硬度及涂层的弹性模量随着SiC含量的增加而增加.
    Abstract: SiC reinforced cobalt-based alloy composite coatings on the surface of the low carbon steel substrate was deposited by plasma transferred arc (PTA) weld surfacing by using synchronization powder feeding method. The mass fraction of SiC was 5%, 10% and 20% respectively. Microstructure and phase composition were characterized by optical microscope, scanning electron microscopy (SEM), X-ray diffraction and energy dispersion spectroscopy. The Vickers microhardness and elasticity modulus were tested by microhardness tester and nano-indenter, respectively. Results indicated that γ-Co and Cr23C6 existed in the cobalt-based alloy coatings. The phases of (C, Fe)r7C3, CoCx, Co3C and a small amout of SiC appeared with addition of different content of SiC ceramic particles. Hypoeutectic microstructure was observed in Co-based alloy coatings, which changed to eutectic and hypereutectic form with increase addition of SiC. The microhardness was improved with increase of SiC addition, and it reached HV0.5874 with 20% SiC. The nanoindentation tests indicated that hardness of the solid solution and the elastic modulus near the fusion line increased with increase of SiC addition.
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    • 参考文献(10)
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  • 收稿日期:  2013-12-16

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