Effects of Mg and La on the evolution of inclusions and microstructure in Ca–Ti treated steel

Lei Wang; Bo Song; Zhan-bing Yang; Xiao-kang Cui; Zhen Liu; Wen-sen Cheng; Jing-hong Mao

doi:10.1007/s12613-021-2285-3

Volume 28 Issue 12

Dec. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(12): 1940-1948

Lei Wang, Bo Song, Zhan-bing Yang, Xiao-kang Cui, Zhen Liu, Wen-sen Cheng, and Jing-hong Mao, Effects of Mg and La on the evolution of inclusions and microstructure in Ca–Ti treated steel, Int. J. Miner. Metall. Mater., 28(2021), No. 12, pp. 1940-1948. https://doi.org/10.1007/s12613-021-2285-3

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Lei Wang, Bo Song, Zhan-bing Yang, Xiao-kang Cui, Zhen Liu, Wen-sen Cheng, and Jing-hong Mao, Effects of Mg and La on the evolution of inclusions and microstructure in Ca–Ti treated steel, Int. J. Miner. Metall. Mater., 28(2021), No. 12, pp. 1940-1948. https://doi.org/10.1007/s12613-021-2285-3

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Research Article

Effects of Mg and La on the evolution of inclusions and microstructure in Ca–Ti treated steel

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Corresponding author:
Bo Song E-mail: songbo@metall.ustb.edu.cn
Received: 5 November 2020; Revised: 22 March 2021; Accepted: 24 March 2021; Available online: 26 March 2021

Abstract

Abstract

The evolution of inclusions and the formation of acicular ferrite (AF) in Ca–Ti treated steel was systematically investigated after Mg and La addition. The inclusions in the molten steel were Ca–Al–O, Ca–Al–Mg–O, and La–Mg–Ca–Al–O after Ca, Mg, and La addition, respectively. The type of oxide inclusion in the final quenched samples was the same as that in the molten steel. However, unlike those in molten steel, the inclusions were Ca–Al–Ti–O + MnS, Ca–Mg–Al–Ti–O + MnS, and La–Ca–Mg–Al–Ti–O + MnS in Mg-free, Mg-containing, and La-containing samples, respectively. The inclusions distributed dispersedly in the La-containing sample. In addition, the average size of the inclusions in the La-containing sample was the smallest, while the number density of inclusions was the highest. The size of effective inclusions (nucleus of AF formation) was mainly in the range of 1–3 μm. In addition, the content of ferrite side plates (FSP) decreased, while the percentage of AF increased by 16.2% due to the increase in the number of effective inclusions in the La-containing sample in this study.
- lanthanum;
- magnesium;
- calcium;
- titanium;
- nonmetallic inclusions;
- evolution;
- acicular ferrite

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