上方侧注式双辊铸轧制备Al-10Cu合金薄带

Top Side-pouring Twin-roll Casting Thin Strip of Al-10Cu Alloy

针对单辊法制备带材自由表面质量差、传统铸轧工艺铸轧速度慢且不能制备宽凝固区间合金的缺点,提出一种可以改善表面质量,提高生产速度的上方侧注式双辊铸轧工艺。以Al-10Cu合金为试验材料,制备出宽100mm,厚1.7～2mm,长数m的金属薄带,铸轧速度可以达到60m/min。并对带坯表面状态和微观组织做了比较分析。结果表明,应用异径双辊铸轧工艺可以制备传统工艺难以制备的铝合金,并且带形和表面质量均良好,无明显缺陷;微观组织细小均匀,无明显偏析。为了更直观地了解成形过程中熔体的情况,利用ANSYS Fluent软件进行了模拟,与试验相符合。

Aiming at the poor surface conditions of the strips produced by single-roll casting and a slower speed and limited applicable alloys in conventional twin-roll casting,a new method of top side-pouring twin-roll casting process was proposed to overcome those disadvantages.Al-10Cu alloy strip with 100mm in width and 1.7～2.0mm in thickness as well as several meters long was produced successfully,and the casting speed could reach up to 60m/min.The surface quality and microstructure of the Al-10Cu strip produced were observed by OM（optical microscope）,SEM（scanning electron microscope）.The results show that the top side-pouring twin roll casting process can produce those alloys strips which cannot be produced by conventional twin roll casting,and the profile and surfaces of the strip exhibit desirable with ignorable defects,and the microstructure is fine and homogeneous with absence of observable segregation.In order to understand the behavior of the molten metal during casting,a numerical simulation was conducted using the ANSYS Fluent,and the results verified the experimental ones.