Thermomechanical Treatment of High-Shear Melt-Conditioned Twin-Roll Cast Strip of Recycled AA5754 Alloy
Thermomechanical Treatment of High-Shear Melt-Conditioned Twin-Roll Cast Strip of Recycled AA5754 Alloy
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DOI：
10.1007/s11837-018-3190-8
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发表时间：
2019-06-01
期刊：
影响因子：
2.6
通讯作者：
Fan, Zhongyun
中科院分区：
文献类型：
--
作者：
Al-Helal, Kawther;Chang, Isaac;Fan, Zhongyun
为生产具有最小铸造缺陷的再生铝合金带材，开发了一种连续高剪切熔体调节双辊铸轧工艺。采用高剪切熔体调质来提高再生铝的杂质容忍度。研究结果表明，在双辊铸轧过程中，通过在铸轧前进行强化熔体调质，可以控制铸轧过程中的凝固过程，从而以最小的缺陷促进等轴生长，改善板材质量。熔体调质双辊铸轧(MC-TRC)AA5754合金具有细小的等轴晶和均匀的基体组织，消除了中心偏析。铸态熔体调质双辊铸轧AA5754带材在430℃保温30min的热机械处理后出现明显的再结晶，比常规双辊铸轧有明显的改善。采用熔体调质和形变处理后，MC-TRC带材的延伸率比TRC带材提高了57.2%，极限拉伸强度提高了4.1%。
A continuous high-shear melt conditioning twin-roll casting process has been developed for production of recycled aluminum alloy strip with minimum casting defects. High-shear melt conditioning is applied to increase the impurities tolerance of recycled aluminum. The results of this study showed that solidification during twin-roll casting can be controlled by using intensive melt conditioning prior to casting, which can promote equiaxed growth with minimal defects and result in improved sheet quality. Melt-conditioned twin-roll cast (MC-TRC) AA5754 alloy exhibited fine equiaxed grains and homogenized matrix structure while centerline segregation was eliminated. As-cast melt-conditioned twin-roll cast AA5754 strips showed clear grain recrystallization after thermomechanical treatment at 430 degrees C for 30 min, representing an improvement over conventional twin-roll casting. The MC-TRC strip showed 57.2% higher elongation and 4.1% higher ultimate tensile strength compared with the TRC strip after applying melt conditioning with thermomechanical treatment.