镧对无取向电工钢氧化铝夹杂物的改性机理,Steel Research International

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镧对无取向电工钢氧化铝夹杂物的改性机理
Steel Research International ( IF 1.9 ) Pub Date : 2022-06-21 , DOI: 10.1002/srin.202200212
Qiang Ren ₁ , Zhiyuan Hu ₂ , Lin Cheng ₃ , Xiaomin Kang ₃ , Yujie Cheng ₁ , Lifeng Zhang ₄

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通过实验室实验研究了 1600 ℃无取向电工钢中镧对氧化铝夹杂物的改性机理。在镧处理后 1、5、10 和 30 分钟，使用配备有能量色散光谱的自动扫描电子显微镜分析夹杂物。分析了钢中总氧（TO）、总硫（TS）和总镧（TLa）的含量。结果表明，镧以两种方式对Al ₂ O ₃夹杂物进行改性。一是溶解的镧直接还原Al ₂ O ₃夹杂物中的铝，形成LaAl ₁₁ O ₁₈或LaAlO ₃夹杂物。另一个是新的La ₂O ₂ S 或LaS _x壳优先在Al ₂ O ₃的外部生成并形成多相夹杂物。随着时间的增加，La ₂ O ₂ S 或LaS _x壳层逐渐与Al ₂ O ₃核反应生成稳定的含镧夹杂物。镧处理初期，有许多瞬态夹杂物，包括 LaS _x、La ₂ O ₂S和La-P(-As)由于镧的高浓度而形成，同时随着时间的增加逐渐重新溶解。随着钢中TLa含量的增加，稳定夹杂物的形成顺序为Al ₂ O ₃ → LaAl ₁₁ O ₁₈ → LaAlO ₃ → La ₂ O ₂ S → LaS _x，与热力学分析一致。

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Modification Mechanism of Lanthanum on Alumina Inclusions in a Nonoriented Electrical Steel

The modification mechanism of lanthanum on alumina inclusions in a nonoriented electrical steel at 1600 °C is investigated using laboratory experiments. Inclusions are analyzed using an automatic scanning electron microscope equipped with energy-dispersive spectrum at 1, 5, 10, and 30 min after lanthanum treatment. The contents of total oxygen (TO), total sulfur (TS), and total lanthanum (TLa) in steel are analyzed. Results show that Al₂O₃ inclusions are modified by lanthanum in two ways. One is that the dissolved lanthanum directly reduces the aluminum in Al₂O₃ inclusions and forms LaAl₁₁O₁₈ or LaAlO₃ ones. The other is that a new La₂O₂S or LaS_x shell is preferentially generated at the outside of Al₂O₃ and forms multiphase inclusions. With time increasing, the La₂O₂S or LaS_x shell gradually reacts with the Al₂O₃ core and generates stable lanthanum-containing inclusions. At the initial stage of lanthanum treatment, many transient inclusions including LaS_x, La₂O₂S, and La–P(–As) are formed due to the high concentration of lanthanum, while gradually redissolving with time increasing. With the increase in TLa content in steel, the formation sequence of stable inclusions is Al₂O₃→ LaAl₁₁O₁₈→ LaAlO₃→ La₂O₂S → LaS_x, which is consistent with thermodynamic analysis.

更新日期：2022-06-21

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