High Temperature Oxidation Behavior Of Several Steel Materials In Kerosene Combustion Atmosphere

High temperature oxidation of metal refers to the process in which a metal material reacts with oxygen at high temperatures.In addition to oxygen,other oxidizing gases can also cause catastrophic corrosion to metallic materials.For example,chlorine,CO2,H2S and other gases can make metal oxidizes,too.In reality,it is not a single type of gas that corrodes metal materials.The mixed atmosphere produced by the combustion of the fuel will also oxidize the metal material.A complex atmosphere is formed during the combustion process,including CO,CO2,water vapor,and incompletely burned carbon particles.Among them,both CO2 and water vapor are oxidizing,and both CO and incompletely combusted carbon are reductive,so high temperature oxidation of metal materials in such a high temperature environment is a very complicated process.In this paper,the high temperature oxidation behavior of kerosene combustion atmosphere on metal materials is studied.In order to achieve rapid on fire,Xinjiang terrorists generally use flammable fuels such as kerosene and alcohol.The combustion of flammable fuels will affect the high-temperature oxidation behavior of metal materials.When heavy oil is mined,the fire-flooding process will also on fire.The thick,formed gas atmosphere can cause catastrophic corrosion to the oil pipeline.Therefore,studying the high-temperature oxidation behavior of the combustion atmosphere on the metal material not only contributes to the investigation of the arson case,but also has great significance for the exploitation of heavy oil.The metal materials in this study are industrial pure iron DT4 steel and 37Mn5 steel.Due to the long history of research on steel materials,the research methods at that time were relatively backward,and few people could study the initial oxidation behavior of steel materials,especially the high temperature oxidation behavior in this complex atmosphere.Therefore,it is also very important for the initial high temperature oxidation behavior of iron and steel,especially the high temperature oxidation behavior in this complex atmosphere.The main findings in the paper are as follows:(1)In the short-term oxidation experiment of DT4 steel at 700?,the oxide film formed in the early kerosene combustion atmosphere is relatively thick.As the oxidation time becomes longer,the thickness of the oxide film formed in the air is as thick as 8 minutes.This is because the kerosene combustion atmosphere is accelerated to accelerate oxidation,but the kerosene combustion time is relatively short.When the kerosene combustion atmosphere is exhausted,the difference between the two is gradually reduced until the oxide film of both is as thick.Moreover,there are many defects in the oxide film when there is a kerosene combustion atmosphere,and defects in the oxide film are gradually reduced when the kerosene combustion atmosphere disappears.(2)When oxidized in a kerosene combustion atmosphere at 700? and air,the oxidation rate of DT4 steel in the kerosene combustion atmosphere is large,and the kinetic curve approaches the parabolic law.The thickness of the oxide film is about twice the thickness of the oxide film formed in the air,and oxidation.The film is relatively porous,the oxide film is intact during the oxidation process,and the outer layer of the oxide film is Fe3O4 and Fe2O3,and the inner film is FeO;the oxidation kinetic curve in air is not parabolic,and the formed oxide film is relatively dense,starting at 16 minutes.The oxide film began to peel off and there was no FeO film of the inner layer.The incompletely burned carbon generated during the combustion of the kerosene makes the oxide film loose and porous,and the water vapor enters the pores of the oxide film to accelerate the growth of the oxide film.In the oxide film near the Substrate-Scale interface,the oxide film of the kerosene combustion atmosphere is columnar crystal,and the crystal grains are relatively large;while the air is equiaxed,the crystal grains are relatively small.(3)In the oxidation experiments at 600?,700? and 800?,the oxidation weight gain of 37Mn5 steel in kerosene combustion atmosphere and air atmosphere is linear,and the weight gain in air at 700? and the weight gain in 600? kerosene combustion atmosphere Closer.In the air at 800? due to the peeling of the oxide film,its oxidation is more important than the weight gain in the kerosene combustion atmosphere at 700?.When oxidizing in air,37Mn5 steel causes blasting of the oxide film due to decarburization,and the oxide film peels off at 800? due to bulging;in the absence of combustion atmosphere,the porous oxide film does not peel off,but at 800? on the oxide film crack.Fe3O4 precipitates in the FeO film of the inner layer in the absence of combustion atmosphere,and the closer the Substrate-Scale is,the smaller the precipitate is.The carbon generated by combustion is adsorbed on the surface of the oxide film,and only part of Fe3O4 can be carbon.Caused by the restore.(4)When the oxidizing atmosphere,oxidation temperature and oxidation time are the same,the oxidation rate of DT4 steel is much larger than the oxidation rate of 37Mn5 steel.The oxide film formed by air in 37Mn5 steel does not peel off,but the oxide film formed by DT4 steel in the air peels off.(5)After scratching the same depth of scratch on the surface of Q235 steel and DT4 steel and oxidizing under the same conditions,the scratches on the surface of DT4 steel are always shallow,and no scratches on the surface are observed even in the kerosene combustion atmosphere.When the substrate used is the same,the scratch on the surface of the sample after oxidation in the kerosene combustion atmosphere is shallower than the scratch left in the air.