球形铸造碳化钨颗粒对堆焊层组织及耐磨性能的影响  

Effect of Spherical Cast Tungsten Carbide Particles on Microstructure and Wear Resistance of Surfacing Layer

作　　者：王蕾[1] 刘辛[1] 谢焕文[1] 邹黎明[1] 蔡一湘[1] 

机构地区：[1]广东省科学院广东省材料与加工研究所,广州510650

出　　处：《机械工程材料》2017年第7期13-17,23,共6页Materials For Mechanical Engineering

基　　金：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)

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,堆焊层中的鱼骨状莱氏体组织减少,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,耐磨性越好。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 fishbone 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.

关 键 词：球形铸造碳化钨 堆焊层 显微组织 耐磨性能 

分 类 号：TG422.1[金属学及工艺—焊接]