SWRS82B钢中稀土元素对氧化铝改性的晶体学

doi:10.13228/j.boyuan.issn0449-749x.20200014

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Abstract In order to further study and control the alumina inclusions in SWRS82B steel,the modification of alumina with rare earth element cerium was studied. The thermodynamics and edge-edge matching model were used to calculate the precipitation conditions of rare earth inclusions and the degree of interatomic mismatch between Al₂O₃ and rare earth oxygen (sulfide) compounds,and between γ-Fe and rare earth oxygen (sulfide) compounds, which investigate the effectiveness of rare earth cerium inclusions as heterogeneous nucleation of Al₂O₃ and γ-Fe,and further prove the effectiveness of rare earth cerium elements to modify B-type alumina inclusions and improve the properties of steel. The calculation results show that in the temperature range from 0 to 2 000 K,the Gibbs free energy for the reaction to generate CeAlO₃ inclusions is the lowest,and the possibility of cerium oxide (sulfide) formation is low under the same conditions,and the rare earth cerium oxide (sulfur) compound can be used as the core of heterogeneous nucleation of Al₂O₃,and the rare earth cerium oxy (sulfide) compound can be used as the core of heterogeneous nucleation of γ-Fe;Al₂O₃ can effectively nucleate on the rare earth cerium oxide (sulfide) compound,and Al₂O₃ is preferentially heterogeneous nucleation occurs on Ce₂O₂S;γ-Fe can effectively nucleate on Al₂O₃ and rare earth cerium (sulfide) compounds,and γ-Fe preferentially nucleates on Al₂O₃,causing irregularly shaped alumina inclusions to transform into near-spherical cerium aluminate inclusions,revealing the mechanism of non-metallic inclusions in SWRS82B steel to degenerate. The actual effect of plastic inclusion treatment provides a theoretical basis.

Key words： SWRS82B steel thermodynamics rare earth inclusion mismatch degree crystallography

Received: 09 January 2020

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	WANG Yi
	LI Chang-rong
	ZENG Ze-yun
	XI Zuo-bing

Cite this article:

WANG Yi,LI Chang-rong,ZENG Ze-yun等. Crystallization of alumina modified by rare earth elements in SWRS82B steel[J]. Iron and Steel, 2020, 55(10): 69-74.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200014 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I10/69

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