摘要
采用CO2气体保护堆焊,并喷射Fe-C-Cr-Mn-B系合金粉,在Q235碳钢表面制备耐磨堆焊层,研究了B元素含量变化对堆焊层组织和性能的影响。采用金相显微镜和XRD分析堆焊层微观组织及相成分,利用硬度计和磨损试验机测试堆焊层的硬度和耐磨性。研究结果表明:未添加B元素时堆焊层组织为马氏体和奥氏体,添加B后堆焊层中形成了(Fe,Cr)2B和(Fe,Cr)23(C,B)6等硬质硼化物。随着含B量的增加,堆焊层洛氏硬度逐渐增加,堆焊层耐磨性呈现先升高后降低的趋势;当B含量为4%时,堆焊层的耐磨性最佳。
Hardfacing layer was prepared on the surface of Q235 steel by the method of CO2 gas shielded welding with Fe-C-Cr-Mn-B spraying powder. The effects of B content on microstructure and properties of the surfacing layer were investigated. The microstructure and composition layer were investigated by OM and XRD. The hardness and wear resistance were tested using hardness tester and wear testing machine. The results show that the microstructure of surfacing layer is composed of martensite and austenite without B addition. Hard horide of （Fe, Cr）2B and （Fe, Cr）23（C, B）6 were formed in the surfacing layer after B element was added. With the increase orB content, the Rockwell hardness of surfacing layer increases gradually, while the wear resistance increases firstly and then decreases. The wear resistance of the layer is best when B content is 4%.
出处
《热加工工艺》
CSCD
北大核心
2014年第12期163-165,173,共4页
Hot Working Technology
基金
2013年黑龙江省大学生创新创业训练计划资助项目(201310222005)
关键词
堆焊
组织
硬度
耐磨性
hardfacing
microstructure
hardness
wear resistance
