Thermodynamic and dynamic analysis of selective oxidation of 0.2C-5.0Mn-0.5Si-1.0Al medium-Mn steel

doi:10.13251/j.issn.0254-6051.2024.11.003

Abstract

Abstract: Thermal and dynamic calculations were performed on 0.2C-5.0Mn-0.5Si-1.0Al medium-Mn steel, and combined with the analysis of the oxidation behavior of the tested steel annealed at 790 ℃ in a 5% H₂-N₂ atmosphere, the selective oxidation behavior of alloy elements Mn, Al and Si was studied. By thermodynamic calculations, the order of precipitation of the oxides in the tested steel is Al₂O₃>MnAl₂O₄>SiO₂>MnSiO₃, Mn₂SiO₄or MnO, and the composition of the oxides at 790 ℃ and a dew point of -30 ℃(P_(O₂)=9.83×10^-23 atm) is determined to be MnO+MnAl₂O₄+Mn₂SiO₄. The products of oxide layer of the tested steel obtained after annealing are in agreement with the thermodynamic calculations. The outer oxide layer primarily consists of a continuously distributed MnO layer, accompanied by Al and Si oxides which undergo selective oxidation first, distributed outside the MnO layer. The inner oxide layer contains Mn-Al-Si-O elements, which corresponds to the thermodynamic calculation results of MnO+MnAl₂O₄+Mn₂SiO₄. The Wagner model is employed to predict the internal oxidation behavior of Al and Si elements by utilizing the diffusion data in ferrite matrix, which provides theoretical substantiation for the control of selective oxidation on the surface of high-strength steel plates.

Key words: medium-Mn steel, thermodynamics, dynamics, selective oxidation of surface

CLC Number:

TG142.3

Zhou Jianhu, Li Yan, Ding Wei, Fang Qi. Thermodynamic and dynamic analysis of selective oxidation of 0.2C-5.0Mn-0.5Si-1.0Al medium-Mn steel[J]. Heat Treatment of Metals, 2024, 49(11): 17-22.

References

[1]McDermid J R, Zurob H S, Bian Y. Stability of retained austenite in high-Al, low-Si TRIP-assisted steels processed via continuous galvanizing heat treatments[J]. Metallurgical and Materials Transactions A, 2011, 42(12): 3627-3637.
[2]Shibli S M A, Meena B N, Remya R. A review on recent approaches in the field of hot dip zinc galvanizing process [J]. Surface and Coatings Technology, 2015, 262: 210-215.
[3]Liu H, Shi W, He Y, et al. The effect of alloy elements on selective oxidation and galvanizability of TRIP-aided steel[J]. Surface and Interface Analysis, 2010, 42(12/13): 1685-1689.
[4]Kim Yunkyum, Shin Minsoo, Tang Chengying, et al. Wettability of Mn_xSi_yO_z by liquid Zn-Al alloys[J]. Metallurgical and Materials Transactions B, 2010, 41(4): 872-875.
[5]Suzuki Y, Yamashita T, Sugimoto Y, et al. Thermodynamic analysis of selective oxidation behavior of Si and Mn-added steel during recrystallization annealing[J]. ISIJ international, 2009, 49(4): 564-573.
[6]Abuluwefa H T. Thermodynamics and kinetics of surface oxidation of steels during annealing in H₂-N₂ atmospheres[C]//Proceedings of the International Multi Conference of Engineers and Computer Scientists. 2012: 2.
[7]张楠, 李岩, 定巍. 0.2C-5Mn-0.5Si-2.5Al中锰钢临界退火后的微观组织及力学性能[J]. 金属热处理, 2021, 46(7): 37-42.
Zhang Nan, Li Yan, Ding Wei. Microstructure and mechanical properties of 0.2C-5Mn-0.5Si-2.5Al medium manganese steel after intercritical annealing[J]. Heat Treatment of Metals, 2021, 46(7): 37-42.
[8]魏寿昆. 冶金过程热力学[M]. 北京: 科学出版社, 2010.
[9]Kawano T, Renner F U. Tailoring model surface and wetting experiment for a fundamental understanding of hot-dip galvanizing[J]. ISIJ International, 2011, 51(10): 1703-1709.
[10]Khondker R, Mertens A, McDermid J R. Effect of annealing atmosphere on the galvanizing behavior of a dual-phase steel[J]. Materials Science and Engineering A, 2007, 463(1/2): 157-165.
[11]Bale C W, Chartrand P, Degterov S A, et al. FactSage thermochemical software and databases[J]. Calphad, 2002, 26(2): 189-228.
[12]Kjellqvist L, Selleby M. Thermodynamic assessment of the Fe-Mn-O system[J]. Journal of Phase Equilibria and Diffusion, 2010, 31: 113-134.
[13]Masanori S, Yusuke F, Yusuke O, et al. Wetting behavior of Zn-Al liquid on Si-containing steel after surface oxidation and reduction treatment[J]. Metallurgical and Materials Transactions B, 2020, 51(2): 467-479.
[14]Zhou D, Dayuan Z, Mian L, et al. Insight into the law and mechanism of selective oxidation of Q&P steel under different annealing parameters[J]. Materials Research Express, 2020, 7(10): 106524.
[15]Cho Lawrence, Jung Geun Su, Cooman C De Bruno. On the transition of internal to external selective oxidation on CMnSi TRIP steel[J]. Metallurgical and Materials Transactions A, 2014, 45(11): 5158-5172.
[16]冯士杰, 江社明, 李远鹏, 等. 预氧化对第三代汽车钢热浸镀锌的影响[J]. 金属热处理, 2014, 39(4): 26-30.
Feng Shijie, Jiang Sheming, Li Yuanpeng, et al. Influence of peroxidation on galvanizability of the third generation automotive steel[J]. Heat Treatment of Metals, 2014, 39(4): 26-30.
[17]Liu H, He Y, Li L. Application of thermodynamics and Wagner model on two problems in continuous hot-dip galvanizing[J]. Applied Surface Science, 2009, 256(5): 1399-1403.
[18]Wang Kun, Ding Yuwen, Liu Ya, et al. Experimental study and thermodynamic analysis on the selective oxidation of DP1180 dual-phase steel[J]. Surface and Interface Analysis, 2021, 54(2): 117-125.
[19]任廷栋. 汽车用高锰钢选择性氧化对热浸镀锌性能影响的研究[D]. 上海: 上海大学, 2020.
Ren Tingdong. Study on the effect of selective oxidation on hot dip galvanizing performance of high manganese steel for automotive applications[D]. Shanghai: Shanghai University, 2020.
[20]Bhadhon K M H, McDermid J R. Selective oxidation of a medium-Mn third generation advanced high strength steel during austenitizing and intercritical annealing[J]. Journal of the Electrochemical Society, 2022, 169(6): 061504.