【摘要】 采用 H0 8A焊芯及石墨、钛铁、钒铁、人造金红石等药皮组分研制了新型耐磨粒磨损堆焊焊条 ,研究了堆焊层的显微组织与性能 .结果表明 ,通过高温电弧冶金反应生成的碳化物比较均匀地弥散分布于基体组织中 ,大部分分布于基体组织的晶界上 ,呈不规则块状、角状或条状 .碳化物是Ti C、VC的密集集合体 .基体组织是典型的低碳马氏体形貌 ,低碳马氏体基体组织配合弥散分布的碳化物是获得良好抗裂性和高耐磨性堆焊金属的微观基础 .堆焊金属主要相构成为α- Fe+γ- Fe+VC+ Ti C+ Fe3 C.药皮中钛铁、钒铁、石墨加入量增加 ,堆焊层硬度提高 ,工艺性能和抗裂性能恶化 .堆焊层硬度可达到 HRC60以上 ,相对耐磨性是 D667焊条的 5倍更多还原

【Abstract】 A new wearability hardfacing electrode was developed by using the core of H08A and the coat contents of Fe-Ti, Fe-V, graphite, rutile, etc. The microstructure and properties of hardfacing metal were systemically researched. The results show that the carbides formed by high temperature arc metabllurgic reaction are dispersedly distributed in the base structure and basically distributed along the verge of crystal grain. The carbides are compression aggregation of TiC, VC and present irregular block, angle and stick. The base microstructure of hardfacing metal is lath martensite. The lath martensite and dispersedly distributed carbides are the micro-base of the hardfacing layer with satisfactory wearability and well cracking resistance. The constitutive phases of hardfacing metal are α-Fe+γ-Fe+VC+TiC+Fe₃C. The hardness of hardfacing metal increases with the increase of contents of Fe-Ti, Fe-V, graphite, while the cracking resistance and welding technique are worsen off. The hardness of surfacing metal can be more than HRC60, and its relative wearability is five times that of D667.更多还原