Optimization Of Process Parameters For Laser Cladding Of Cobalt-based Alloys And Research On Its Properties

The valves used in sugar plants are exposed to very complex working conditions,and manufacturers need valves with a long life cycle to cope with corrosive syrup mixtures.Hard sealed eccentric half ball valves are most suitable in terms of mechanical principle,but surface modification of their sealing surfaces is required to optimise their overall performance,making the valve sealing surfaces hard,corrosion resistant and solid.The repair and strengthening of high-performance valve sealing surfaces belongs to the field of parts remanufacturing,in which laser cladding technology as a new technology gradually replaced many traditional technical means,is very long-lasting development prospects.Laser cladding is used in this article as a surface modification technology for valve sealing surfaces,Controlling the shape of the cladding layer and controlling the quality of the cladding layer are two core research directions to optimize the best laser cladding process parameters.The reaction surface method is used as a design scheme to fit the statistical model between process parameters and topographic features.F-test evaluates the robustness of the evaluation model,and a satisfactory function is used as an optimization method to obtain the best process parameters.The analysis of this mathematical model helps us to control the cladding characteristics quantitatively.At the same time,the tissue properties of the clad layer are tested and analysed using testing instruments,such as tissue growth patterns,elemental composition,corrosion resistance,etc.This allows the strengths and weaknesses of each specimen to be compared in terms of both intrinsic principles and extrinsic properties.By summarising and explaining the reasons for this performance,the quality characteristics of the clad layer can be accurately optimised.The experimental results obtained in this paper: the melt profile characteristics are closely related to the quality and the melt process;the error rate of the single-pass melt model is less than 10% and the prediction rate of the multi-pass melt model is greater than 80%.The best results were obtained when the laser power was 1600 w,the scanning speed was 6mm/s,the powder feed rate was 17.5g/min and the lap rate was 40%.The surface of the clad layer under this process has good macroscopic morphology,no cracks and pits;the geometric features of the section can be quantitatively controlled to the size required by the project.The cobalt-based alloy cladding layer is dense,and the phase composition and elemental distribution are in accordance with its performance.The cobalt-based cladding layer with hardness increased by2.9 times,wear resistance increased by 5.8 times and high temperature resistance greatly improved is an obvious test substrate.