原位合成(Ti,V)C增强铁基耐磨复合材料的研制  

Investigation on wear resistance of in-situ(Ti,V) C reinforced Fe-based composite material

作　　者：宗琳[1] 郭宁[2] 张小玲[1] 

机构地区：[1]沈阳化工大学机械工程学院,沈阳110142 [2]西南大学材料与能源学部,重庆400715

出　　处：《焊接学报》2017年第8期10-14,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51501158;51601154)

摘　　要：采用激光熔覆技术,通过调节钒含量制备多组Fe-Ti-V-C合金系统.借助金相、SEM和XRD等分析手段对熔覆层组织和碳化物形貌进行分析.结果表明,熔覆层中随着钒含量的提高,基体组织由F向F+M转变;颗粒状复合碳化物(Ti,V)C的数量逐渐增多,当加入钒含量超过13.3%时,初生(Ti,V)C形态由颗粒状转变为花瓣状.此外湿砂磨粒磨损试验表明,适量钒显著改善了熔覆层的耐磨性,当钒含量为13.3%时,大量颗粒状复合碳化物(Ti,V)C均匀弥散分布在铁素体及针状马氏体基体上,使得熔覆层具有最佳的耐磨性.A series of Fe-Ti-V-C hardfacing alloys with different vadium contents were prepared by laser cladding.The microstructure and carbides morphology were investigated by means of optical microscope (OM) scanning electron microscopy (SEM) and X-ray diffraction (XRD).The results shows that the matrix transforms from ferrite to ferrite plus martensite,the volume fraction of primary (Ti,V) C complex carbides increase as the V content increase,the morphology of primary (Ti,V) C changes from globular to exploded shape when the V content is higher than 13.3%.In addition,the results of wet sand rubber wear tests indicate that proper V content significantly improves the abrasion resistance of hardfacing alloys.when V content is13.3%,the microstructure characteristic with a high volume fraction of globular (Ti,V) C complex carbides are distributed uniformly and dispersly in the ferrite and lath martensite matrix,which suggests that the cladding layer has a excellent wear resistance.

关 键 词：耐磨性 组织 Fe-Ti-V-C系 

分 类 号：TG422.1[金属学及工艺—焊接]