\r杨立军^{1, 2}，孙 涛¹，王耀伟¹，黄一鸣\r^{1, 2}\r
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AuthorsHTML:\r杨立军^{1, 2}，孙 涛¹，王耀伟¹，黄一鸣\r^{1, 2}\r
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AuthorsListE:\rYang Lijun^{1, 2}，Sun Tao¹，Wang Yaowei¹，Huang Yiming\r^{1, 2}\r
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AuthorsHTMLE:\rYang Lijun^{1, 2}，Sun Tao¹，Wang Yaowei¹，Huang Yiming\r^{1, 2}\r
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Unit:\r\r1. 天津大学材料科学与工程学院，天津 300350；\r
\r\r2. 天津市现代连接技术重点实验室，天津 300350\r
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Unit_EngLish:\r1. School of Materials Science and Engineering，Tianjin University，Tianjin 300350，China；
2. Tianjin Key Laboratory of Advanced Joining Technology，Tianjin 300350，China\r
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Abstract_Chinese:\r铁基材料目前已广泛应用在海洋石油开采、先进武器制造等领域，针对其耐磨性差的问题，采用自主研制的药芯焊丝和钨极氩弧焊(TIG)制备含有碳化钨颗粒的熔覆层，利用扫描电子显微镜和X 射线衍射仪分析熔覆层的显微组织，通过硬度测试和磨损实验研究熔覆层的力学性能．实验结果表明，通过TIG 和药芯焊丝的方式可以制备碳化钨分布均匀的熔覆层．熔覆层中的碳化钨颗粒分为未溶解或少量溶解、部分溶解和完全溶解3 种状态，对应的显微硬度分别为2 474.7 HV_0.1、1 456 HV_0.1和735 HV_0.1，熔覆层基体的平均硬度为616.6 HV_0.1．未溶解和部分溶解的碳化钨颗粒与基体之间发生元素扩散，碳和钨元素由碳化钨颗粒内部向基体中扩散，铁元素由基体向碳化钨颗粒中扩散，使得碳化钨与基体之间形成冶金结合，基体对碳化钨颗粒起到良好的支撑作用，碳化钨则保护基体免受摩擦副的作用，从而提升熔覆层的耐磨性．完全溶解的碳化钨通过其与基体凝固时形成硬度较高的铸态组织来提升基体的耐磨性能．在与GCr15 钢轮对磨的情况下，加载50 N 的力，实验1 h，熔覆层的磨痕宽度为2.5 mm，磨损体积为0.4 mm³，仅为母材的1/50．\r
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Abstract_English:\rIron-based materials have been widely used in offshore oil exploration，advanced weapons manufacturing，and other fields. In order to solve the problem of the poor wear resistance of iron matrix materials，a coating containing tungsten carbide particles was prepared by means of a self-developed flux-cored wire and tungsten inert gas (TIG) welding. The microstructure of the coating was analyzed by scanning electron microscopy and X-ray diffractometry. Mechanical properties of the coating were studied with hardness and wear tests. The experimental results showed that uniform distribution of the tungsten carbide cladding layer could be prepared by TIG welding and fluxcored wire. Tungsten carbide particles in the cladding layer can be divided into three states：undissolved or slightly dissolved, partially dissolved, and completely dissolved. Corresponding microhardnesses would be 2 474.7 HV_0.1，1 456 HV_0.1，and 735 HV_0.1，respectively. The average hardness of the matrix of the cladding layer was 616.6 HV_0.1. Element diffusion occurred between undissolved and partially dissolved tungsten carbide particles and matrix. Carbon and tungsten elements diffused from the tungsten carbide particles to the matrix，while the iron diffused from the substrate to the tungsten carbide. The formation of a metallurgical combination between the tungsten carbide particles and matrix allowed the matrix to better support the particles. Tungsten carbide protected the matrix from the frictional effect of the pairing，thereby improving the wear resistance of the cladding layer. Fully dissolved tungsten carbide can improve the wear resistance of the matrix by forming a cast structure with a higher hardness when solidifying with the matrix. In the case of grinding with a GCr15 steel wheel，a force of 50 N was loaded. After 1 h，the width of the wear mark of the cladding layer was 2.5 mm and the wear volume was 0.4 mm³，or just 1/50 of the base metal.\r
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Keyword_Chinese:碳化钨熔覆层；钨极氩弧焊；磨损；显微组织\r

Keywords_English:WC cladding layer；tungsten inert gas(TIG)；wear；microstructure\r


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