Fe-Mn-Al-C低密度钢中的脱氧合金化夹杂物

doi:10.13228/j.boyuan.issn1006-9356.20230317

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Abstract In order to study the formation and mechanism of inclusions in Fe-Mn-Al-C low density steel during deoxygenation alloying, Si, Mn, and Al were used for deoxygenation alloying of the steel. Inclusions in Fe-Mn-Al-C low density steel samples were observed by field emission scanning electron microscopy combined with automatic inclusion analysis system. The results show that the inclusions in Fe-Mn-Al-C low density steel are classified into six types, single particle Al₂O₃ inclusion, single particle MnS inclusion, single particle AlN inclusion, Al₂O₃-MnS composite inclusion, AlN-MnS composite inclusion and Al₂O₃-AlN-MnS composite inclusion. The number of single particle Al₂O₃, MnS, and AlN inclusions is relatively large, and the size of the inclusions is mainly less than 5 μm. Thermodynamic calculations have found that Al₂O₃ forms during deoxygenation alloying, AlN begins to precipitate when the solid fraction is 0.844, while MnS begins to precipitate in the solid-phase steel after complete solidification. The calculation of two-dimensional lattice mismatch between different inclusions shows that the mismatch degrees of MnS (110)/Al₂O₃ (001), AlN (001)/Al₂O₃ (001), and MnS (100)/AlN (100) are 8.41%, 11.66%, and 8.94%, respectively, indicating that Al₂O₃ and AlN can provide heterogeneous nucleation sites for the nucleation of MnS, and Al₂O₃ can also provide heterogeneous nucleation sites for the nucleation of AlN. FactSage 8.2 thermodynamic software calculation is found that when cooled from 1 873 K to 373 K, the mass fractions of Al₂O₃, AlN, and MnS inclusions are 0.129%, 0.017%, and 0.615%, respectively. The study results can provide theoretical guidance for the formation of inclusions in Fe-Mn-Al-C low density steel during deoxygenated alloying.

Key words： Fe-Mn-Al-C low density steel inclusion thermodynamics two-dimensional lattice mismatch heterogeneous nucleation

Received: 19 May 2023

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	Articles by authors
	CAO Lei
	GUO Yuhang
	WANG Guocheng
	SHANG Deli

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CAO Lei,GUO Yuhang,WANG Guocheng等. Deoxygenated alloying inclusions in Fe-Mn-Al-C low density steel[J]. China Metallurgy, 2023, 33(10): 42-49.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230317 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I10/42

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