Quantitative characterization of reaction behavior between La-bearing FeCrAl melt and CaO–Al2O3–La2O3-based slags and its guidance for design of mold flux

IF 2.5 2区材料科学

Journal of Iron and Steel Research International Pub Date : 2024-06-04 DOI:10.1007/s42243-024-01233-2

Lei Fan, Tian-peng Qu, De-yong Wang, Cheng-jun Liu

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Abstract

The reaction behavior between CaO–Al₂O₃–La₂O₃-based slags and La-bearing FeCrAl melt was quantitatively characterized, which was further compared with the reaction behavior of CaO–SiO₂-based slags. Based on this, the new type of mold flux for La-bearing FeCrAl alloy continuous casting was designed and its basic properties were evaluated. The results showed that the order of reaction degree of fluxing agents in CaO–Al₂O₃–La₂O₃-based slags is (Na₂O) > (B₂O₃) > (Li₂O), and the percentages of mass change of fluxing agents were 85.8, 54.29 and 42.35 wt.%, respectively. Moreover, the addition of (Li₂O) and (Na₂O) promoted the reaction between (CaO) and [Al], and the reaction degree of the former was weaker than that of the latter, which was due to the greater effect of (Na₂O) on the activity of (CaO) and (Al₂O₃) than (Li₂O). Compared with the reactivity of CaO–SiO₂-based slags, the percentages of mass change of Al and La caused by slag–steel reaction decreased by 10.63–14.36 and 39.78–50.49 wt.%, respectively. The percentages of mass change of (Al₂O₃), (La₂O₃) and (CaO) in slags highest increased by 17.71, 17.98, and 7.81 wt.%, respectively. The reactivity of CaO–Al₂O₃–La₂O₃-based slags was significantly weakened. Ultimately, the new type of mold flux was designed and the composition range was determined. The fundamental properties of new mold flux basically meet the theoretical requirements for La-bearing FeCrAl alloy continuous casting.

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含 La 的铁铬铝熔体与 CaO-Al2O3-La2O3 基熔渣之间反应行为的定量表征及其对模具助熔剂设计的指导作用

定量分析了 CaO-Al2O3-La2O3 型炉渣与含 La 铁铬铝熔体之间的反应行为，并与 CaO-SiO2 型炉渣的反应行为进行了比较。在此基础上，设计了用于含 La FeCrAl 合金连铸的新型结晶器熔剂，并对其基本特性进行了评估。结果表明，CaO-Al2O3-La2O3 基熔渣中助熔剂的反应程度顺序为 (Na2O) > (B2O3) > (Li2O)，助熔剂的质量变化百分比分别为 85.8、54.29 和 42.35 wt.%。此外，（Li2O）和（Na2O）的加入促进了（CaO）和[Al]的反应，前者的反应程度弱于后者，这是由于（Na2O）对（CaO）和（Al2O3）活性的影响大于（Li2O）。与 CaO-SiO2 基炉渣的反应活性相比，炉渣-钢反应引起的 Al 和 La 的质量变化百分比分别降低了 10.63-14.36 和 39.78-50.49 重量%。炉渣中 (Al2O3)、(La2O3) 和 (CaO) 的质量变化百分比最高，分别增加了 17.71、17.98 和 7.81 wt.%。基于 CaO-Al2O3-La2O3 的炉渣的反应活性明显减弱。最终，设计出了新型模具助熔剂，并确定了其成分范围。新型结晶器熔剂的基本特性基本满足含 La 铁铬铝合金连铸的理论要求。

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来源期刊

Journal of Iron and Steel Research International 工程技术-冶金工程

自引率

16.00%

发文量

161

审稿时长

2.8 months

期刊介绍： Publishes critically reviewed original research of archival significance Covers hydrometallurgy, pyrometallurgy, electrometallurgy, transport phenomena, process control, physical chemistry, solidification, mechanical working, solid state reactions, materials processing, and more Includes welding & joining, surface treatment, mathematical modeling, corrosion, wear and abrasion Journal of Iron and Steel Research International publishes original papers and occasional invited reviews on aspects of research and technology in the process metallurgy and metallic materials. Coverage emphasizes the relationships among the processing, structure and properties of metals, including advanced steel materials, superalloy, intermetallics, metallic functional materials, powder metallurgy, structural titanium alloy, composite steel materials, high entropy alloy, amorphous alloys, metallic nanomaterials, etc..