温度对高锰高铝钢氧化动力学规律的影响

doi:10.13228/j.boyuan.issn0449-749x.20220586

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Abstract In order to clarify the oxidation kinetics of high Mn-high Al steel at high temperature, the oxidation behavior of that steel under dry air at 900-1 300 ℃ was studied by isothermal oxidation method. Both the morphological structure and phase composition of the scale on cross-section and surface were analyzed by XRD and SEM+EDS. The phase generations under different oxygen partial pressure and different oxidation temperature were calculated by FactSage software. The results showed that the oxidation of high Mn-high Al steel followed the parabolic law at 900-1 300 ℃. The oxidation activation energy was 128.04 kJ/mol when oxidation temperature below 1 100 ℃. The outer layer of scale was rich manganese oxide, the middle layer was manganese-iron oxide, and the inner layer was mainly manganese-iron oxide with a small amount of alumina. There were lots of pores in both the middle layer and the inner layer. The pores near the outer side of the middle layer were bundle pores, and the pores near the inner layer of the middle layer were irregular large round pores. While the pores in the inner layer were mostly small pores distributed evenly. When oxidation temperature above 1 200 ℃, the oxidation activation energy was 212.84 kJ/mol. There were also three layers within the scale of steel, which was quite different from the oxidation result below 1 100 ℃ in composition. The outer layer was iron-rich oxide, the middle layer was Mn-rich oxide, the inner layer was mainly iron-manganese oxide with a small amount of Al₂O₃ particles distributed. The density and continuous integrity of the scale were better than that of the scale below 1 100 ℃. The hindrance to the oxidation process was significantly stronger than that of the scale below 1 100 ℃. The oxidation limiting step was the diffusion of metal ions when oxidation temperature below 1 100 ℃. When the oxidation temperature above 1 200 ℃, the oxidation limiting step changed into the diffusion of oxygen ions. During the oxidation process, in the matrix of the steel, irregular wedge-shaped intergranular oxides would formed below 1 100 ℃, while granular ferromanganese composite oxides and a small amount of AlN could be found above 1 200 ℃.

Key words： high Mn-high Al steel high temperature oxidation oxidation kinetics activation energy oxidation mechanism

Received: 11 September 2022

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	Articles by authors
	SONG Ming-ming
	MEN Chao-qi
	LI Jian-li
	ZHU Hang-yu
	HAN Yun
	XUE Zheng-liang

Cite this article:

SONG Ming-ming,MEN Chao-qi,LI Jian-li等. Effect of temperature on oxidation kinetics of high Mn-high Al steel[J]. Iron and Steel, 2023, 58(4): 138-147.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220586 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I4/138

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