外加纵向磁场电流对等离子弧堆焊陶瓷相增强铁基合金组织结构和耐磨性的影响  

Effect of Longitudinal Magnetic Field on Microstructure and Wear Resistance of Plasma Arc Surfacing Alloy

作　　者：宗琳[1,2] 刘政军[2] 

机构地区：[1]沈阳化工大学机械学院,辽宁沈阳110142 [2]沈阳工业大学材料学院,辽宁沈阳110178

出　　处：《材料保护》2013年第8期28-29,55,共3页Materials Protection

基　　金：辽宁省教育厅资助项目(L2012152)资助

摘　　要：为了改善原位合成陶瓷相增强铁基堆焊合金的组织结构和耐磨性,采用等离子弧堆焊在20G碳钢表面制备原位合成陶瓷相增强铁基合金时施加纵向磁场,研究了外加磁场电流对堆焊层组织结构、硬度及耐磨性能的影响,对磁场作用机理进行了初步讨论。结果表明:外加磁场能够促进晶粒的细化,磁场电流为2.0 A时,堆焊层中六边形M7C3陶瓷硬质相最多且均匀分布,硬度和耐磨性最好;随着磁场电流的继续增大,由于电磁阻尼占主导地位,堆焊层的性能下降。In-situ ceramic reinforced Fe-based alloys were prepared by plasma arc surfacing in the presence of externally applied longitudinal magnetic field. The influence of magnetic field current on the microstructure, hardness and wear resistance of as-prepared surfacing alloys was studied,and the action mechanism of magnetic field was primarily discussed. Results showed that externally applied magnetic field helped to accelerate grain refining. When the magnetic field current was kept as 2. 0 A,the amount of hexagonal ceramic hard phase M 7 C 3 reached the maximum,and it had uniform distribution as well,corresponding to the highest hardness and wear resistance of the Fe-based alloy. Besides,electromagnetic damping tended to predominate with increasing magnetic field current,and hence the properties of the Fe-based surfacing alloy declined therewith.

关 键 词：等离子弧堆焊 磁场电流 陶瓷相增强铁基合金 20G碳钢 组织结构 耐磨性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]