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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

  • 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.

     

    Abstract: 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 is 13.3%, 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.

     

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