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等离子原位冶金复合碳化钨合金组织特性与结晶机理研究 被引量:8

Microstructure and Crystallization Mechanism of Composite WC Alloy Produced by Plasma In-situ Metallurgy
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摘要 采用等离子原位冶金技术得到了复合碳化钨合金。通过扫描电镜、X射线衍射分析、硬度测试等手段对其微观组织、物相组成和结晶机理进行了研究。结果表明:复合碳化钨合金的组织比较均匀,硬质相主要为WC,W2C,Fe3W3C和少量Cr7C3,平均硬度HRA可达84.2,合金中的WC相显微硬度HV0.1可达2636。高温液相熔体中,WC的形核主要靠溶解扩散反应方式,生长方式为以(0001)面为基面,沿〈0001〉方向的层片状堆叠方式生长,最终成长为层片状三角棱柱空间结构,晶粒最大能长到70μm以上。 The composite WC alloy was prepared by plasma in-situ metallurgy.The microstructure,phases,hardness and crystallization mechanism were examined separately by SEM,XRD,hardness-testing devices.The results show that the microstructure of the sample is uniform,and the hard phases are WC,W2C,Fe3W3C and a small amount Cr7C3.The average hardness(HRA) of the alloy is 84.2,the average hardness HV0.1 of the WC grains in the alloy is 2636.In the molten pool,dissolution and precipitation are the nucleation mechanism of the WC crystals.The growth pattern of WC is a layer-by-layer fashion by means of multi-layer stacking of(0001) basal along 〈0001〉 orientation to form a triangular prism shape,the largest WC grains can may grow to more than 70μm.
出处 《材料工程》 EI CAS CSCD 北大核心 2011年第8期72-76,共5页 Journal of Materials Engineering
基金 山东省自然科学基金资助项目(2009ZRB01417) 山东科技大学春蕾计划资助项目(2010AZZ002)
关键词 等离子原位冶金 复合碳化钨 显微组织 结晶机理 plasma in-situ metallurgy composite WC microstructure crystallization mechanism
作者简介 王淑峰(1980-),男.博士研究生,讲师,主要研究方向为等离子技术及应用,联系地址:山东青岛经济技术开发区前湾港路579号山东科技大学材料学院(266510),E—mail:wwxiaojun@163.com
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