新型双熔敷极TiC-VC增强耐磨堆焊组织与性能

Study on microstructure and propertys of TiC-VC particles reinforced surfacing layer prepared by novel twin electrodes welding

摘要: 采用钛铁、钒铁和石墨等原材料,首次利用新颖的双熔敷极焊条电弧焊,合成TiC-VC超硬质颗粒增强Fe基堆焊层.利用X射线衍射、扫描电镜、耐磨性试验分析了堆焊层的组织与耐磨性能.结果表明,双熔敷极焊条电弧焊条件下,其特殊的电弧结构使得Ti元素主要起脱氧剂的作用,用于形成碳化物的很少,堆焊层中仅有少量TiC形成.堆焊层主要以VC为碳化物增强相,伴随少量(Ti,V)C共生晶粒分布在基体上.堆焊层硬度在55 HRC以上,磨损失重是Q235基体金属的1/16,具有很高的耐磨性.

Abstract: The TiC-VC particles reinforced surfacing layer synthesized from ferrotitanium,ferrovanadium and graphite through metallurgy interaction by novel twin electrodes welding arc had been investigated in this paper.The microstructure and abrasion resistance of surfacing layer were analyzed by XRD、SEM and wear test machine.The results showed that Ti element mainly acted as deoxidize due to the unique twin electrodes welding arc structure,only a small quantity of TiC was formed in the surfacing layer.The main reinforcing phases in surfacing layer were in situ VC,as well as a litter(Ti,V) C phase dispersed in matrix.The surfacing layer had higher surface rigidity of exceeded 55 HRC and better abrasion resistance property.Wear weight loss of surfacing layer was only 1/16 of that of Q235 substrate.