堆焊电流对16Mn钢板堆焊层组织与性能的影响

Effects of Welding Current on Microstructure and Properties of 16Mn Steel Plate Surfacing Layer

为研究堆焊电流对刮板输送机中部槽堆焊层组织和性能的影响,采用手工电弧焊对与中部槽相同材料和热处理工艺的16Mn钢板进行不同强度电流的堆焊。通过对堆焊层进行组织观察和力学性能测试,分析了电流对耐磨堆焊层组织、硬度、耐磨性和韧性的影响。结果表明：堆焊层组织为马氏体、残余奥氏体和一些碳化物。随着堆焊电流的增大,残余奥氏体含量减少,马氏体变粗大,堆焊层硬度增大,韧性降低。不同电流的堆焊层冲击断口形貌均为河流花样,表明堆焊层韧性都不高。150 A电流焊接的堆焊层耐磨性最佳,主要是由于残余奥氏体起支撑作用。

In order to study the effect of welding current on the microstructure and mechanical properties of the scraper conveyor central groove＇s surfacing layer, the surfacing tests on the 16Mn steel plate which had same state with the central groove＇s material and heat treatment were carried out by manual arc welding with different currents. Through the microstmcture observation and mechanical performance tests of the surfacing layer, the effect of welding current on the microstructure, hardness, wear resistance and toughness of the surfacing layer was analyzed. The results show that the microstmcture of the surfacing layer is martensite, residual austenite and small amount of carbides. With the increase of welding current, the content of residual austenite decreases, the martensite corasens, and the hardness of surfacing layer increases and the toughness decreases. The impact fracture morphologies of the surfacing layer under different currents are river pattern, which shows that the toughness of the the surfacing layer is not high. The wear resistance of the surfacing layer welded with the current of 150 A is the best, which is mainly due to the supporting role of residual austenite.