STUDY ON DRY TRIBOLOGICAL PROPERTIES OF WEAR RESISTANT FeCrB⁃TiC COMPOSITES

The 4%weight percentage TiC reinforced FeCrB based anti⁃wear composite was designed and prepared by powder metallurgy technology.The effects of sliding speed and load on the dry friction and wear properties of the composite were systematically studied by reciprocating dry friction experiments with GCr15 steel ball pairs.The X⁃ray diffraction(XRD),scanning electron microscope(SEM)and other techniques were used to analyze the phase composition and micro morphology of the composite.The experimental results show that the phase of the composite isα⁃Fe,FeCr,TiC,Cr2B and Fe2B.The addition of TiC significantly increases the hardness of the material and slightly decreases the density.With the increase of sliding speed and load,the friction coefficient decreases generally and the wear rate increases significantly.The pinning strengthening effect of TiC on the Fe matrix composite inhibits the spalling and deformation of the material,and the wear resistance of the material is significantly improved.Through comprehensive analysis,TiC can effectively improve the dry tribological properties of FeCrB alloy,and its wear mechanism is mainly delamination wear and abrasive wear.