TiC-VC颗粒增强Fe基熔敷层组织与耐磨性能

以H08A为焊芯，以钛铁、钒铁和石墨等为药皮组分，利用焊接电弧高温冶金反应，在Q235基体上制备TiC-VC复合超硬颗粒增强Fe基熔敷层。利用扫描电镜、X射线衍射仪、透射电镜、能谱分析仪及磨损试验，研究了熔敷层的组织、性能及组分加入量对熔敷层性能的影响。研究结果表明：冶金反应形成的TiC-VC颗粒尺寸细小，且弥散分布在基体上；熔敷层硬度在HRC55以上，具有很高的耐磨性和良好的抗裂性；钛铁、钒铁及石墨加入量（质量分数）分别为15％～18％、12％～14％和8％～10%时，熔敷层具有良好的耐磨性能和抗裂性能。

Microstructure and Wear Properties of Fe-based Hardfacing Layer Reinforced by TiC-VC Particles

Using H08A bare electrode and coating of ferrotitanium(FeTi),ferrovanadium(FeV) and graphite etc.,Fe-based hardfacing layer reinforced by TiC-VC particles,which were formed by the reaction among FeTi,FeV and C during welding,was produced on the substrate Q235 steel.The microstructure and properties of the hardfacing layer were investigated by means of scanning electron microscopy(SEM),X-ray diffractiometry(XRD),transmission electron microscopy(TEM),energy dispersive spectrometer(EDS) and wear test.Effects of the composition of the coating in electrode on the microstructure and properties of hardfacing layer were also investigated.The results show that TiC-VC particles are formed by direct metallurgical reaction and distributes evenly in the matrix.The fine TiC-VC particles are dispersed in the matrix.The hardness of hardfacing layer is over 55 HRC.Therefore,Fe-based hardfacing layer reinforced by TiC-VC particles is found to possess good wear resistance and crack resistance,while amount(mass fraction) of FeTi,FeV and graphite are 15%~18%,12%~16% and 8%~10%,respectively.