Reserch On Fe-Cr-Ti-C And Fe-Cr-V-C Flux Cored Wires

Wear failure is the main reason of much mechanical failure. In order to improve the lifeof equipments and to extend the maintenance cycle of equipments, one of the methods is toweld a layer of wearable metal on the surface of parts to improve the wear resistance. In thistopic based on the objects of two alloy systems on Fe-Cr-Ti/V-C, to form a wearablesurfacing layer, welding the flux cored wire with different formulations composed bydifferent alloy powder on the surface of steel by the way of TIG, observing the microstructureof surfacing, detecting and analyzing the mechanical properties of the surfacing. Developed the fluxcored wire which can form hard phase by the way of in situ synthesis, researched differentformulation of flux cored wire on Fe-Cr-Ti/V-C and the effect of microstructure andmechanical properties of surfacing on different adding amount of Fe, Cr, Ti, V etc. under thetwo alloy systems.The results show that in the flux cored wire on Fe-Cr-Ti-C, when the addition amount ofCr is17.1%and the addition amount of Ti is6.8%, the surfacing layer has the highesthardness of59.2HRC, the M7C3carbide in surfacing layer forms the best formation of thenetwork wear-resistant framework, the particle of TiC distributed uniformly and the surfacinglayer has the greatest wear resistance, the minimal amount of wear is0.3897g after beingworn for three minutes in the abrasive with the graininess of50. When the addition amount ofCr is15.3%and the addition amount of Ti is5.9%, the structure of surfacing layer has both ofthe moderate hardness and better toughness, the minimal amount of wear is0.1135g afterbeing worn for five minutes in the condition of impact for fifty times every minutes with theimpact energy of0.5kg·m. In the flux cored wire on Fe-Cr-V-C, when the addition amount ofCr is17.1%and the addition amount of V is10.8%, the particle of V8C7distributed uniformly,the hard phase of M7C3has a clear grid-like framework, the minimal amount of wear is0.5979g under the same condition of abrasive wear as the former test of Fe-Cr-Ti-C. Whenthe addition amount of Cr is15.3%and the addition amount of V is9.6%, the surfacing layerhas the minimal amount of wear is0.1096g under the same condition of impact abrasion.