直流横向磁场作用下钴基合金的组织及性能  

Microstructures and mechanical properties of Co-based surfacing alloys under DC transverse magnetic field

作　　者：刘长军[1] 刘政军[2] 苏明[2] 苏允海[2] 

机构地区：[1]沈阳工业大学化工装备学院,沈阳111003 [2]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《焊接学报》2011年第3期53-56,60,共5页Transactions of The China Welding Institution

基　　金：辽宁省自然科学基金资助项目(20042025)

摘　　要：为了提高堆焊层的性能,研究直流横向磁场对等离子弧堆焊层的组织和性能的影响,在低碳钢表面进行钴基合金粉末等离子弧堆焊时施加直流横向磁场,焊后对堆焊层进行硬度、磨损、显微组织以及X射线衍射分析,并系统地分析直流横向磁场对等离子堆焊层硬度和耐磨性的影响规律.结果表明,施加磁场时堆焊层性能比无磁场时堆焊层性能好.当堆焊电流为160 A和磁场电流为3 A,钴基合金堆焊层组织的晶粒细化效果最佳,堆焊层金属的硬度和耐磨性达到最佳值.外加横向磁场可以抑制"磁偏吹",进而增强工艺稳定性.In order to improve the properties of surfacing layers,study the influence of surfacing current and magnetic field current on properties and microstructure of surfacing layer,DC transverse magnetic field was applied when Co-based alloy was welded on the surface of low-carbon steel by plasma arc surfacing.The hardness,wear resistance,microstructure and phase constitution of the surfacing layers were investigated via hardness and wear tests as well as SEM and XRD analysis.Furthermore,the influence of surfacing current and magnetic field current on the hardness and wear resistance of the surfacing layer were studied.The results showed that the properties of surfacing layers with introducing DC transverse magnetic field were better than that without magnetic field.When the surface current was 160 A and the magnetic field current was 3 A,the optimal effect of grain refining could be gained.The optimal hardness and wear extent have been obtained at the same time.Furthermore,the DC transverse magnetic field can suppress the 'arc blow' and improve the stability of surface process.

关 键 词：直流横向磁场 钴基合金 等离子弧堆焊 力学性能 显微组织 

分 类 号：TG422.1[金属学及工艺—焊接]