等离子弧堆焊层的组织与性能的磁场控制  

MAGNETIC FIELD CONTROL OVER MICROSTRUCTURE AND PROPERTIES OF PLASMA ARC SURFACING WELDING LAYER

作　　者：刘政军[1] 苏允海[1] 刘臣[1] 刘铎[1] 李永奎[1] 汪德涛[2] 

机构地区：[1]沈阳工业大学材料科学与工程学院,110023 [2]沈阳仪表科学研究院,110043

出　　处：《焊接》2005年第10期36-39,共4页Welding & Joining

摘　　要：在对两种铁基合金(Fe5和Fe3)进行等离子弧堆焊过程中加入纵向直流磁场来控制堆焊层的硬质相形 态及分布,并对两种堆焊层进行了硬度、磨损试验,显微组织及X射线衍射分析,对两种粉末的堆焊层的组织性能 进行研究。结果表明,施加磁场的堆焊层要比无磁场作用的堆焊层硬度高、耐磨性好;磁场电流为3 A时的堆焊层 性能最佳;合金堆焊层的显微组织α、γ固溶体被充分细化,并获得理想的硬质相Cr7C3,CrB等。To control the shape and distribution of hard phase in surfacing welding, longitudinal dc magnetic field was applied during plasma surfacing welding of two iron - based alloy （ Fe5 and Fe3）. Hardness, wearing, microstructure and X - ray diffraction analysis of the two surfacing welding layer were tested as well as the structure and property of the surfacing welding layer of the two powders were studied. The results showed that the surfacing welding layer formed with magnetic field had higher hardness and better wearing than the layer fomed without magnetic field, The properties of surfacing welding .layer were optimum when the magnetic field current was 3 A and the microstructures of alloy surfacing welding layer obtained ideal hard phase such as Cr7 C3, CrB etc and sohd solution α and γ were refined sufficiently.

关 键 词：等离子弧堆焊 磁场 硬质相 组织与性能 磁场控制 堆焊层 X射线衍射分析 铁基合金 显微组织 直流磁场 

分 类 号：TG455[金属学及工艺—焊接] TG146.2[一般工业技术—材料科学与工程]