磁场作用下反极性等离子弧铁基耐磨堆焊层组织性能的研究  

Study on Microstructure and Properties of Anti-Polar Plasma Arc Iron-Based Hardfacing Layer under Magnetic Field

作　　者：丁春辉[1] 艾星宇 刘政军[2] 邵慧 DING Chunhui;AI Xingyu;LIU Zhengjun;SHAO Hui(Shenyang Special Equipment Testing and Research Institute, Shenyang110035, China;School of Materials Science &Engineering, Shenyang University of Technology, Shenyang 110870, China)

机构地区：[1]沈阳特种设备检测研究院,辽宁沈阳110035 [2]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《热加工工艺》2019年第19期56-60,共5页Hot Working Technology

摘　　要：为了分析横向交流磁场对铁基耐磨堆焊层组织性能的影响规律,在反极性等离子弧堆焊过程中施加横向交流磁场,对堆焊层进行硬度、耐磨性、显微组织和物相组成进行分析。试验结果表明,当磁场电流Im=2.5 A、磁场频率f=40 Hz、焊接电流I=160 A时,堆焊层的硬度最大,为61.5 HRC,耐磨性最好,磨损量为0.0524 g。此时电弧搅拌作用明显,晶粒明显细化,析出相Cr7C3明显增多,并且以六角形均匀分布在堆焊层中,起到良好的"钉扎"作用,有效地提升了堆焊层的硬度以及耐磨性。In order to analyze the effect laws of transverse AC magnetic field on the microstructure and properties of iron-based hardfacing layer,transverse AC magnetic field was applied in the anti-polar plasma arc surfacing process and the hardness,abrasion resistance,microstructure and phase composition of the surfacing layer were analyzed.The experimental results show that when the magnetic field current Im is 2.5 A,the magnetic field frequency f is 40 Hz,and the welding current I is 160 A,the hardness of the surfacing layer is the biggest,which is 61.5 HRC.The abrasive resistance of the surfacing layer is the best and the abrasion loss is 0.0524 g.At the moment,the arc stirring effect is obvious,the grains are refined evidently.The precipitation phase Cr7C3 increases obviously and the precipitated phase is evenly distributed in the shape of hexagonal in the surfacing layer,which plays a good"pinning"effect and effectively improves the hardness and abrasive resistance of the surfacing layer.

关 键 词：等离子弧堆焊 横向磁场 磨料磨损 耐磨性 组织性能 

分 类 号：TG455[金属学及工艺—焊接]