Fe-Cr-C-B-N系堆焊合金的显微组织及耐磨性

发布时间：2018-01-21 08:55

本文关键词： 堆焊合金药芯焊丝组织性能硬质相　出处：《焊接学报》2017年06期 　论文类型：期刊论文

【摘要】：在低碳钢表面采用明弧堆焊的方法制备了不同氮含量的Fe-Cr-C-B-N系堆焊合金.借助X射线衍射仪(XRD)、光学显微镜(OM)、扫描电子显微镜(SEM)、洛氏硬度计和湿砂磨损试验机对堆焊层的组织和性能进行分析.结果表明,堆焊层的显微组织为马氏体+奥氏体+BN+M23(C,B)6+M3(C,B)+M2B.随着氮添加量的增多,组织中有BN生成,初生奥氏体向针状马氏体转变,枝晶间共晶组织的数量减少;堆焊层硬度增加,磨损量出现先减少后增加的趋势.当堆焊层中氮的含量为0.17%时,基体组织与硬质相之间匹配良好,堆焊层的综合性能达到最佳,其硬度值为62.7 HRC,而磨损量仅为0.054 2 g.
[Abstract]:The Fe-Cr-C-B-N surfacing alloys with different nitrogen content were prepared on the surface of low carbon steel by the method of bright arc surfacing. The X-ray diffractometer (XRD) and optical microscope (OM) were used to prepare the surfacing alloys. Scanning electron microscope (SEM), Rockwell hardness tester and wet sand wear tester were used to analyze the microstructure and properties of the surfacing layer. The microstructure of the surfacing layer is martensite austenitic BN M23, Con B6 M3, Con B) M2B. With the increase of nitrogen addition, BN is formed in the microstructure. The primary austenite transformed into acicular martensite and the number of interdendritic eutectic structure decreased. When the content of nitrogen in the surfacing layer is 0.17, the matching between the matrix structure and the hard phase is good, and the comprehensive properties of the surfacing layer reach the best. The hardness is 62.7 HRC and the wear is only 0.054 2 g.
【作者单位】：沈阳工业大学材料科学与工程学院;大连海洋大学应用技术学院;
【基金】：辽宁省教育厅一般科研资助项目(L2015075)
【分类号】：TG455
【正文快照】： 0序言由于在工业生产领域中存在着严重的磨料磨损,国内每年都会造成巨大的经济损失.堆焊熔覆一定成分的合金是修复金属表面的一种常用方法[1].由于不加入Ti,Nb,V和W等贵重金属元素,常用于低应力磨料磨损的Fe-Cr-C-B系堆焊合金可以较大幅度的节约修复成本,并受到了各行各业的关

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