Optimization Of Laser Remanufacturing Process And Performance Research On Hydraulic Column Surfac

In response to the problems of scratches,wear,dents,and corrosion on the surface of hydraulic columns during service in complex mine environments,this article adopts laser cladding technology to remanufacture their surface.Using a high-power semiconductor fiber coupled laser to laser cladding Fe601 and XYF26F5Z-1 alloy powders on a 27 Si Mn steel flat plate on a hydraulic column,the process parameters were optimized through a reasonable design of orthogonal experiments and single factor experimental schemes.During the optimization process of the optimal process parameters,the mechanical properties and corrosion resistance of the cladding layer were thoroughly analyzed and its mechanism was explored.Finally,the optimal process parameters were selected for the final physical cladding.The experimental results show that the optimal process parameters for preparing an optimal cladding layer of Fe601 alloy powder are: laser power: 2000 W,powder feeding rate:15g/min,scanning speed: 6mm/s,overlap rate: 50%;The microstructure growth of the optimal cladding layer gradually transitions from bottom planar crystals to cellular and columnar crystals to equiaxed crystals at the top,and the dendrites at the top of the cladding layer are arranged tightly and finely;Compared with the substrate,the hardness increases by0.3 times,and the friction coefficient decreases by 0.12.The wear mechanism of the substrate is mainly adhesive wear,while the wear mechanism of the cladding layer is mainly abrasive wear;The corrosion mechanism of the heavily corroded area of the cladding layer is intergranular corrosion.According to electrochemical corrosion tests,the tendencies and rates of corrosion of the cladding layer are lower than those of the 27 Si Mn steel substrate.The cladding layer has better corrosion resistance compared with the substrate.The corresponding process parameters for preparing an optimal cladding layer of XYF26F5Z-1 alloy powder are laser power: 2600 W,scanning speed: 8mm/s,powder feeding rate: 15g/min,and overlap rate of 40%;The variation in melting height(maximum value)of the cladding layer in a single pass cladding sample with laser power shows an opposite change from melting width of the cladding layer;The penetration depth of the overlapping cladding layer gradually increases with increasing overlap;The corrosion resistance level of multi lap specimens 1,4,and 7 is level 10;The hardnesses of these three samples are 2.31 times,2.37 times,and 2.44 times that of the substrate,respectively;The friction coefficient and wear amount of these three samples are lower than that prepared by Fe601 alloy powder;The growths in the first four bottom layers of the multi layer overlap cladding layer are the same,while growths in the first and second to fourth layers in the middle and top layers show differences.By comparing the mechanical properties and corrosion resistance of optimal cladding layers prepared by these two alloy powders,the optimal process parameters of XYF26F5Z-1alloy powder were ultimately selected for the final physical cladding on the hydraulic pillar.This study has important guiding significance for the practice of hydraulic column repair and strengthening engineering.