横纵磁场下铁基合金堆焊层组织性能的对比分析  

Comparison of microstructure and properties of deposited metal under DC longitudinal/transverse magnetic field

作　　者：苏允海[1] 李乐成[1] 刘政军[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《焊接学报》2012年第4期33-36,114,共4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：将Fe5自熔合金采用等离子弧堆焊设备堆焊到低碳钢表面,在堆焊的过程中施加直流横向和直流纵向磁场,并调节磁场参数和堆焊工艺参数,对不同参数下堆焊试样进行硬度和磨损试验,采用显微电镜和扫描电镜对堆焊层显微组织进行分析,研究两种磁场状态下堆焊层组织、性能的差异性,并对其中的机理进行探究.结果表明,直流横向磁场和直流纵向磁场均可提高硬质相的形核率,改善堆焊层的组织性能;横向磁场作用下堆焊层中硬质相杂乱分析,而纵向磁场使堆焊层中的硬质相以规则的"六边形"出现,这使得横向磁场对提高堆焊层的硬度较明显,纵向磁场对提高堆焊层耐磨性效果明显.The Fe5 alloy was overlaid on low carbon steel by plasma arc surfacing with DC longitudinal magnetic field and DC transverse magnetic field,respectively.The magnetic field current and surfacing current were changed during surfacing.After PLA with magnetic field,the OM,wear loss test,micro-hardness test were used to analyze the effect of magnetic field style on microstructure and properties of deposited metal.The difference and mechanisms of magnetic field style and parameters on properties and microstructure of deposited metal were researched.The results indicate that the introduced longitudinal and transverse magnetic field can increase the nucleation ratio of hard phase and improve the properties of deposited metal.The distribution of hard phase is random under the transverse magnetic field,but it is hexagonal under longitudinal magnetic field.So the effect of DC longitudinal magnetic field is better than that of DC transverse magnetic field on wear resistance of surfacing layer,the effect of DC longitudinal magnetic field is worse than that of DC transverse magnetic field on hardness of surfacing layer.

关 键 词：等离子弧堆焊 直流横向磁场 直流纵向磁场 铁基合金 组织性能 

分 类 号：TG455[金属学及工艺—焊接]