镧对高碳硬线钢中Al<sub>2</sub>O<sub>3</sub>夹杂物改性的晶体学分析

doi:10.13228/j.boyuan.issn0449-749x.20210356

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Abstract In order to control and improve the number, shape and distribution of alumina inclusions in high carbon hard wire steel, improve the purity of steel, refine the structure of steel, and even the chemical composition of steel, rare earth lanthanum is added to high carbon hard wire steel. The element studies its modification of alumina inclusions. The rare earth oxygen (sulfide) compound formed by adding rare earth lanthanum to high carbon hard wire steel was characterized by scanning electron microscopy and energy spectrum analysis, and the modification of it on alumina was studied. It is found that the addition of lanthanum can change the shape of inclusions. The inclusion changes from an irregular shape to a more regular ellipse, and as the distance between inclusion surface increases, it gradually disperses. Thermodynamics and edge-edge matching model were used to calculate the interatomic mismatch along the dense row crystal direction between γ-Fe and Al₂O₃and the interplanar mismatch of the dense row crystal plane. The possibility and effectiveness of lanthanum inclusions as the nucleation core of primary phase during solidification of molten steel were explored. The results show that after adding lanthanum, according to the Gibbs free energy of inclusions in the temperature range of 1 000-2 000 K, the order of possible inclusions produced in steel is, La₂O₃>La₂O₂S>LaAlO₃>LaS>La₃S₄. The edge-edge matching model was used to calculate the atomic matching between rare earth oxygen (sulfide) compounds and γ-Fe and Al₂O₃. It is found that La₂O₃, LaS, La₂O₂S and La₃S₄ may all be the cores of Al₂O₃ and γ-Fe heterogeneous nucleation. Moreover, La₂O₂S may preferentially become the nucleation core of γ-Fe heterogeneous, while LaS may preferentially become the core of Al₂O₃ heterogeneous nucleation,the modification mechanism of alumina inclusions in steel is revealed, which provides a theoretical basis for the treatment of non-metallic inclusions in high-carbon hard wire steel.

Key words： high carbon hard wire steel rare earth inclusion heterogeneous nucleation edge-edge matching model crystallography

Received: 16 June 2021

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	CHEN Lu
	LI Chang-rong
	XIONG Xing-qiang

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CHEN Lu,LI Chang-rong,XIONG Xing-qiang. Crystallographic analysis of modification of Al₂O₃ inclusions in high carbon hard wire steel by lanthanum[J]. Iron and Steel, 2022, 57(1): 74-82.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210356 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I1/74

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