Study On High Temperature And Electrochemical Corrosion Mechanism Of Rail Materials And High Pressure Simulation Calculation

As one of the safest and most convenient means of transportation,high-speed railway is developing towards the direction of high speed and heavy load,which puts forward higher requirements for the performance of rail.U71Mn material is one of the most commonly used rail materials for high-speed railway.The temperature rise after wheel-rail friction is very important for the failure of rail materials.My country wants to build a high-level modern railway power,so it is necessary to accelerate the development of high-quality railways.As a key component of railway operation,rail is of great significance to the study of corrosion damage mechanism of rail materials.This paper has done the following work and achieved the following results:The corrosion behavior of rail material under high temperature and wear condition was studied.Firstly,the high temperature cyclic corrosion of the rail material was carried out,and then the high temperature corrosion of the rail after friction and wear was studied.The U71Mn rail material was worn to different degrees,and the oxidation behavior of the worn material at different temperatures was studied,and the influence mechanism of high temperature and wear on the rail surface damage was discussed.The results show that temperature and wear can aggravate the corrosion of rail material and damage the material matrix.With the increase of temperature,a large amount of manganese diffuses to the top area of the oxide film,and the content of manganese in the matrix decreases,thus weakening the performance of the matrix material.The electrochemical corrosion behavior of rail materials simulated from industry to coast was studied.In this paper,the mechanism of electrochemical corrosion on rail failure was studied by simulating different industrial and coastal atmospheric environments.The results show that Fe OOH and Fe₂O₃ are the main surface materials for electrochemical corrosion in the industrial and coastal simulated atmosphere.With the increase of HSO₃^-and Cl^-concentration,the corrosion of rail material is aggravated.The simulation calculation of cementite based rail materials was studied.The heavy loading will make the rail under high pressure,and the cementite is the supporting phase of the mechanical properties of the rail material.Materials Studio software is used to simulate the high pressure calculation of the cementite based rail material.The results show that the cementite based rail has a stable structure and good performance under the condition of no pressure.When high pressure exists,it will affect the hardness,wear resistance and toughness of the material.Within a certain pressure range(50 GPa),the material is resistant to wear,but the material cannot withstand higher pressures.Mean:when the rail passes by at high speed,the high pressure will affect the service performance of the rail materials.