Exploration and study on high temperature oxidation dynamic behavior of high Mn and high Al steels
In order to preliminary investigate the effect of surface roughness state and oxidation atmosphere on the oxidation kinetics of high manganese and high aluminum steel at high temperature,the effects of surface roughness state and oxidation atmosphere on the oxidation behavior of high manganese and high aluminum steel at 1 000 ℃ and 1 250℃ were studied by means of oxidation weight gain method.The conclusion is as follows:the oxidation process of the sample in air under different surface roughness conditions at 1 000 and 1 250 ℃ all follow parabolic rule.At 1 000 ℃,the oxidation weight gain of samples with different surface states was almost the same.At 1 250 ℃,the surface state has a little effect on the oxidation weight gain within 60 min.After oxidation longer than 60 min,the oxidation weight gain ratio of preground samples in the order from large to small was 38 μm＞6.5 μm＞polished＞178 μm.When oxygen is introduced into the atmosphere,the oxidation process still follows the parabolic rule at 1 000 ℃.When the oxidation rule at 1 250 ℃ within 80 min,the parabolic rule is followed,while the linear rule is followed when oxidation time longer than 80 min.At the same temperature,there is little difference between the oxide phase composition of air and oxygen atmosphere.The oxide phase composition is slightly different with different oxidation temperatures.At 1 000 ℃,the main phase composition of the oxide is FeO,(FeO)0.798(MnO)0.202,Mn3O4,MnFe2O4,Fe3O4 and Al2O3.At 1 250 ℃,the main phase composition of the oxide is FeO,(FeO)0.798(MnO)0.202,MnFe2O4,FeMn2O4,Fe3Mn3O8 and Al2O3.The content of Al2 O3 during oxygen oxidation at 1 250 ℃ is significantly higher than that in air oxidation.
high Mn-high Al steelhigh temperature oxidationoxidation kineticssurface morphologyoxidation mechanism
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