Structure Refinement Upon Ultrasonic Melt Treatment in a DC Casting Launder
Structure Refinement Upon Ultrasonic Melt Treatment in a DC Casting Launder
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DOI：
10.1007/s11837-020-04269-3
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发表时间：
2020-07-27
期刊：
影响因子：
2.6
通讯作者：
Pericleous, Koulis
中科院分区：
文献类型：
--
作者：
Subroto, Tungky;Eskin, Dmitry G.;Pericleous, Koulis
这项工作的重点是超声熔体处理（UST）在流槽后，中试规模的直接激冷（DC）铸造的152毫米直径的坯料从AA6XXX合金与Zr添加。使用两种铸造温度（650 ° C和665 ° C）来评估它们对所得微观结构（晶粒尺寸、颗粒尺寸和数密度）的影响。组织细化结果表明，在直流铸造流槽中应用超声波技术是可行的。这通过坯料中心的晶粒尺寸相应减小约50%或朝向坯料表面减小更多、平均Al3Zr颗粒尺寸减小以及颗粒数密度增加来量化。当合金在665 ℃下铸造时，获得更高的Al3Zr颗粒密度。最后给出了数值模拟结果，并对如何提高直流铸造流槽内UST的处理质量提出了建议。
This work focuses on ultrasonic melt treatment (UST) in a launder upon pilot-scale direct chill (DC) casting of 152-mm-diameter billets from an AA6XXX alloy with Zr addition. Two casting temperatures (650 degrees C and 665 degrees C) were used to assess their effect on the resulting microstructure (grain size, particle size, and number density). Structure refinement results show the feasibility of UST in the DC casting launder. This is quantified through the corresponding reduction of grain size by around 50% in the billet center, or more towards the billet surface, reduction of the average Al3Zr particle size, and increase in the particle number density. A higher Al3Zr particle density was obtained when the alloy was cast at 665 degrees C. Numerical simulation results and suggestions on how to improve the treatment quality of UST in DC casting launder are also provided.