Research On TIC-VC/Ni-based Cladding Layers By Laser Cladding On The Surface Of Slurry Pump Flow Components

Slurry pump is the main equipment to convey solid-liquid mixture, which is widely usedin the field of metallurgy and mining. There are serious abrasive wear, corrosion and surfacespalling in the trans-flux parts of slurry pump. The low life characterization of slurry pumpcaused huge losses for enterprise, and also wasted a lot of material. In this research, theNi-based cladding layer reinforced by in-situ fabricated TiC-VC by laser cladding on thesurface of trans-flux parts of slurry pump. The microstructure and properties of the claddinglayer were investigated by a series of tests and the main factors influencing microstructureand properties.Through adding FeTi70, FeV50and graphite power to Ni60, the Ni-based cladding layerreinforced by in-situ fabricated TiC-VC by laser cladding. The cladding layers have anexcellent metallurgical bonding with the substrate.The effect of laser processing parameters on microstructure and properties of thecladding layer have been studied, and the result shows that the macrohardness and wearabilityof laser cladding increase with the laser power, but when the laser power level enhanced in acertain extent, the macrohardness and wearability decline with the increment of laser power.the macrohardness and wearability of the cladding layer decreases with the increase of laserscanning speed. Through analysis of orthogonal test discovery laser power is the ultimateaffection of cladding performance, the defocusing amount is the week influence, and thescanning speed between the former affection factor. And the optimized laser processingparameters are as follows: laser power is2.4kW, scanning speed is250mm/min and thedefocusing amount is30mm.The impacts of different ferrotitanium, ferrovanadium and graphite addition onmicrostructure and mechanical properties of cladding layer was studied. With the increasingof ferrovanadium content in the alloy powers, the fluidity of cladding layer was improved, thereinforced phase has serious segregation phenomena, and the shape of the reinforcement isdendritic shape. When the addition ratio of ferrotitanium is zero, the shape of thereinforcement presents rod and granular. The cladding layer can get high macrohardness andgood wearability when the mol ratio of Ti：V：C=0.4：0.6：1.2.The impacts of molybdenum and RE oxide La2O3on microstructure and mechanicalproperties of cladding layer was studied. the result shows that adding molybdenum and REoxide La2O3to the cladding layer can improve TiC-VC reinforced particles distribution. When5%or10%of molybdenum added, the macrohardness and wear resistant of cladding layer is improved. When the content of rare earth element was1wt%, the cladding layer can get besttribological behavior and highest macrohardness, and the weight loss of cladding layer wasonly about1/3of that of substrate.