
机械工程材料
MATERALS FOR MECHANCAL ENGINEERING DOI;10.11973/jxgccl201707003
2017年7月第41卷第7期Vel.41No,7Jul,2017
球形铸造碳化钨颗粒对堆焊层组织及耐磨性能的影响
王蕾,刘辛,谢焕文,邹黎明,蔡一湘
(广东省科学院,广东省材料与加工研究所,广州510650)
摘要:将不同含量和粒径的球形铸造碳化钨颗粒添加到雾化铁粉中制备堆焊焊条,然后在 Q235钢表面进行氧-乙炔火焰堆焊来获得堆焊层,研究了球形铸造碳化钨颗粒的含量和粒径对堆焊层显微组织、硬度及耐磨性能的影响。结果表明:堆焊层中球形铸造碳化钨颗粒边缘有明显的溶解现象,粒径越小,溶解现象越明显;随球形铸造碳化钨颗粒含量的减少,堆焊层中的鱼骨状菜氏体组织减少,随球形铸造碳化钨粒径的减小,莱氏体组织逐渐粗化;球形铸造碳化钨颗粒的含量越高,粒径越小,堆焊层的硬度越高,耐性越好。
关键词:球形铸造碳化钨;堆焊层;显微组织;耐磨性能
中图分类号:TG422.1
文献标志码:A
文章编号:1000-3738(2017)07-0013-05
Effect of Spherical CastTungsten CarbideParticles on Microstructure
and Wear Resistance of Surfacing Layer
WANGLei,LIUXin,IEHuanwen,ZOULiming,CAIYixiang
(Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, China)
Abstract: The spherical cast tungsten carbide particles with different contents and particle sizes was mixed with atomized Fe powder to prepare surfacing electrodes, The surfacing layer on Q235 steel substrate was obtained using oxygen-acetylene flame surfacing. The effect of content and particle size of spherical cast tungsten carbide on the microstructure, hardness and wear resistance of surfacing layer was investigated, The results show that there was an obvious melting phenomenon at the edges of spherical cast tungsten carbide in surfacing layer, The smaller the particle size of spherical cast tungsten carbide was, the more obvious the melting phenomenon was, The fish bone ledeburite decreased with decrease of spherical cast tungsten carbide particles content, and the ledeburite became coarser with reduction of particle size of spherical cast tungsten carbide. The more spherical cast tungsten carbide particles content was, and the smaller particle size was, the higher the hardness was and the better the wear resistance of surfacing layer was
Key words: spherical cast tungsten carbide; surface layer; microstructure; wear resistance
0引言
随着现代化工业的发展,耐磨堆焊技术在矿山机械、农业机械和水力机械等磨损件的修复中得到了越来越广泛的应用。在冲击磨损十分严重的工况
收稿日期:2016-05-14;修订日期:2017-06-11
基金项目:国家国际科技合作专项项目(2011DFR50740),广东省战
略性新兴产业核心技术攻关专项项目(2011A091102007);广州市科技计划项目(2012J5100050)广东省科学院科研平台环境与能力建设专项资金项目(2016GDASPT-0209)
作者简介:王蕾(1981一),女,黑龙江齐齐哈尔人,工程师,硕士
通信作者:刘辛万方数据
条件下,研制高耐磨性焊条对耐磨堆焊技术有着重要的影响。目前,研究人员已针对高耐磨性焊条开展了大量的研究!。有研究表明:通过在焊条药皮中加人大量的碳和铬元素可以提高堆焊层的硬度和耐磨性[3-3],但是当焊条中的含碳量超过7%(质量分数)后,随着含碳量的增加,堆焊层的韧性和抗裂性降低;同时高铬焊条会对焊工的健康不利[+5]。还有研究表明:通过在焊条药皮中加入钻、钼、钨、镍等稀有金属可以获得具有较高耐磨性的堆焊层,但仍然存在抗冲击能力低、裂纹倾向大、界面结合强度低、硬质颗粒易脱落等间题[6-刀,另外,这些元素的高成本也限制了其在生产中的应用[89]。
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