Study On Effect Of Spraying Process Parameters On Metal Surface Erosion

Spray technology is environmentally efficient in steel strip descaling technology characteristic of mechanical descaling methods,domestic and foreign scholars to spray descaling technology research mainly focus on the spray parameters,and the spray descaling at the core of the research on the mechanism of erosion and the erosion mechanism of the different conditions,different materials are different,so it is difficult to give a unified theory.Traditional erosion research focuses on submergence jet,which is a kind of non-submergence jet.Therefore,it is particularly important to explore the erosion mechanism of materials under the condition of non-submergence jet when studying grouting erosion.Erosion mechanism involves many factors,including erosion Angle,erosion speed,abrasive shape,abrasive grain size,abrasive flow rate,ambient temperature,target hardness and so on.This article choose Q235 hot rolled steel plate as the test target of target,with independent research and development of cast,the integrated combination of spray descaling spray test of variable parameters in a series of test platform,based on the theory of erosion,by spray test and finite element simulation to explore the influence of changing the working condition of spray hedge corrosion result,reveal the process of spray test because of the erosion mechanism.The main research contents and results of this paper are as follows:（1）on the basis of all the elements involved in the process of spray test contained in each theory is described in this paper,the jet theory,the theoretical equation of continuous fluid,the theoretical equation of discrete phase,Tulsa erosion model,wall resilience model by combining finite element simulation and mathematical expression,illustrated by analyzing the simulation results and predicted results.（2）The changing regularity of erosion length,erosion rate and erosion concentration rate under the changing Angle was analyzed emphatically.It is found that the erosion length is the longest when the jet Angle is 30°.When the jet Angle is 45°,the erosion rate is the largest.When the jet Angle is 90°,the concentration of erosion is the largest.The variable Angle simulation is combined with Tulsa model,and the erosion Angle function in Tulsa model is piecewise linearized,and the erosion rate and erosion length data are extracted and analyzed.The finite element simulation results are consistent with the experimental results.（3）It is found that the erosion length increases with the increase of the spraying distance.The peak value of the test erosion rate is between 0.0148～0.0176 kg·m^-2·s^-1.The erosion rate decreases first and then increases and decreases with the spraying distance.The data of erosion rate,fluid velocity,particle concentration distribution and hydrostatic pressure distribution were extracted and analyzed by variable distance finite element simulation.The results of finite element simulation were consistent with the experimental results.The erosion rate was proportional to the 1.73 power of impact velocity and inversely proportional to the hydrostatic pressure.（4）The change of erosion area and erosion rate of plate under variable pressure was analyzed by finite element simulation.The erosion area increased with the increase of pressure,and the peak value of erosion rate was 0.0154～0.0214 kg·m^-2·s^-1.The peak value of erosion rate also showed a trend of gradual increase with the pressure of spray.To extract the erosion rate of finite element simulation of the pressure,fluid velocity,fluid distribution,particle concentration distribution data were analyzed,and the finite element simulation results with experimental results,the analysis found that change of erosion area mainly depends on the structure of the jet and the distribution of the particles,the erosion rate and is proportional to the fluid velocity of 1.73 times the power only,nothing to do with static pressure.This paper reveals the relationship between the erosion of metal matrix in the process of shotcrete and various process parameters in the process of shotcrete impact through several shotcrete tests and finite element simulation study,which provides a help for mastering the mechanism of shotcrete erosion and a theoretical support for the popularization and application of shotcrete technology.