Influence of La addition on Non-metallic Inclusions of electrothermal FeCrAl alloy

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-11-14 DOI:10.1016/j.jallcom.2024.177594

Jie Qi, Qiaofu Chen, Yingying Dou, Jinhui Wang, Chengjun Liu, Maofa Jiang

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Abstract

Aiming at the effect of rare earth La on the type and distribution of inclusions in electrothermal FeCrAl alloy, the three-dimensional morphology and composition of inclusions were observed and analyzed by SEM-EDS, and the size and quantity of inclusions were statistically analyzed. The results show that there is only Al₂O₃ inclusion at 1600 ℃. During solidification, with the increase of solid fraction in the alloy system, AlN precipitated at the front of solidification. After adding 0.0093% La, Al₂O₃ was modified into LaAlO₃. When the amount of La was 0.0378%, the main type of inclusion was LaAlO₃+La₂O₂S, the number of inclusions increased obviously, and the proportion of La₂O₂S increased gradually with the increase of heat preservation time. When the content of La was 0.0964%, the proportion of La₂O₂S increased further. After heat preservation for 60 minutes, only La₂O₂S inclusion existed stably in the steel. The polymerization characteristics of inclusions have a significant influence on the particle size of inclusions. At 1600 ℃ for 60 minutes, LaAlO₃ showed a strong polymerization trend in the early stage of heat preservation, and the average particle size of inclusions first increased from 2.34 μ m to 3.31 μm and then decreased to 1.93 μ m. The trend of La₂O₂S polymerization is weak, and the average particle size of inclusions in the samples containing La₂O₂S is small and stable. In the early stage of heat preservation, the average particle size of inclusions is stable in the range of 1.8~2.0 μm.

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添加 La 对电热铁铬铝合金非金属夹杂物的影响

针对稀土 La 对电热 FeCrAl 合金中夹杂物类型和分布的影响，采用 SEM-EDS 观察分析了夹杂物的三维形貌和成分，并对夹杂物的尺寸和数量进行了统计分析。结果表明，仅在 1600 ℃ 时存在 Al2O3 夹杂。在凝固过程中，随着合金体系中固体分数的增加，AlN 在凝固前端析出。加入 0.0093% La 后，Al2O3 被改性为 LaAlO3。当 La 含量为 0.0378% 时，主要夹杂物类型为 LaAlO3+La2O2S ，夹杂物数量明显增加，且随着保温时间的延长，La2O2S 的比例逐渐增加。当 La 含量为 0.0964% 时，La2O2S 的比例进一步增加。保温 60 分钟后，钢中只有 La2O2S夹杂物稳定存在。夹杂物的聚合特性对夹杂物的粒度有很大影响。在 1600 ℃保温 60 分钟的条件下，LaAlO3 在保温初期表现出较强的聚合趋势，夹杂物的平均粒径先从 2.34 μ m 增加到 3.31 μm，然后减小到 1.93 μ m。在保温初期，夹杂物的平均粒径稳定在 1.8~2.0 μm 的范围内。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.