摘要
在低碳钢表面采用自制的自保护药芯焊丝进行明弧堆焊,焊接过程中外加低频脉冲交流纵向磁场,改变磁场电流的大小制备Fe-Cr-C-B系铁基耐磨堆焊合金。利用X射线衍射仪(XRD)、光学显微镜(OM)和扫描电子显微镜(SEM)对堆焊层的显微组织进行分析,用洛氏硬度计和磨料磨损试验机对堆焊层的硬度和耐磨性进行测试。结果表明,外加磁场产生的电磁搅拌作用可以细化堆焊金属的晶粒,改善共晶组织的数量、尺寸与分布形态。当磁场电流从0增加到3A时,堆焊层的硬度从46HRC增加到56HRC,磨损量从0.9924g减少到0.3895g。随着磁场电流的继续增加,堆焊层晶粒粗化,硬度和耐磨性下降。
The open arc surfacing welding was carried out on low carbon steel surface by using the self-made self-shielded flux-cored wire,low frequency pulsed AC longitudinal magnetic field was added in the welding process,and Fe-Cr-C-B Fe based hardfacing alloy was prepared by changing the magnetic field current.The microstructure of the surfacing layer was analyzed by using X-ray diffraction (XRD),optical microscope (OM)and scanning electron microscope (SEM), hardness and wear resistance of the surfacing layer were tested by using Rockwell hardness tester and abrasive wear testing machine.The results show that the electromagnetic stirring produced by the applied magnetic field can refine the grain of the surfacing metal and improve the number,size and distribution of the eutectic structure.When the magnetic field current increases from 0 to 3A,the hardness of the surfacing layer increases from 46HRC to 56HRC,and the wear loss decreases from 0.9924g to 0.3895g.With the fiarther increase of the magnetic field current,the grains coarsen,the hardness and wear resistance of the surfacing layer decrease.
作者
贾华
李萌
JIA Hua;LI Meng(Applied Technology College,Dalian Ocean University,Dalian 116300,China)
出处
《热加工工艺》
CSCD
北大核心
2018年第21期222-225,共4页
Hot Working Technology
基金
辽宁省教育厅科学研究一般项目(L2015075)
关键词
埋弧堆焊
纵向交流磁场
组织性能
硬质相
药芯焊丝
submerged arc welding
longitudinal AC magnetic field
microstructure and properties
hard phase
flux cored wire
