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.,(2021). https://doi.org/10.1007/s12613-021-2285-3
Cite this article as:
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.,(2021). https://doi.org/10.1007/s12613-021-2285-3
Research Article

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

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  • Received: 5 November 2020Revised: 22 March 2021Accepted: 24 March 2021Available online: 26 March 2021
  • The evolution of inclusions and the formation of acicular ferrite (AF) in Ca–Ti treated steel were systematically investigated after Mg and La addition. The inclusions in 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 inclusions in final quenched samples was the same as that in molten steel. However, unlike these in molten steel, 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  to 3 μm. And the content of ferrite side plates (FSP) decreased, while the percentage of acicular ferrite (AF) increased by 16.2% due to the increase in the number of effective inclusions in the La-containing sample in this study.
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