摘要
以自行设计的立式双辊铸轧机铸轧出的厚度为2.5～5.0mm的镁合金铸板为研究对象,提取镁合金板铸轧过程中铸轧速度、铸轧力及辊缝实时变化数值,分析了铸板板形的波动原因,观察了不同铸轧速度条件下镁合金板的表面形貌和微观组织。当铸轧速从8m/min提高到16m/min时,铸板厚度由5.0mm减小到2.5mm,随着铸轧速度的提高,枝晶区比例相应提高。铸轧速度达到16m/min时,中心等轴晶区会缩小甚至消失。在本文实验冷却条件下,不同铸轧速度的铸板每侧枝晶生长高度距铸板表面都约为1mm,结果表明,2.5mm左右是铸轧较理想的板厚。
Abstract：The magnesium alloy plates with the thickness range from 2 mm to 5 mm are rolled by designed machine, the reasons of influencing the sheet shape in casting process are analyzed by the realtime values of the roll-gap, casting force and casting speed in the casting process. The surface morphology and microstructure of magnesium alloy plates with different casting speed are observed. With the casting speed increases from 8 m/min to 16 m/min, the thickness of casting sheet will be changed from 5 mm to 2.5 ram, and the proportion of dendritic crystal zone will also be increased, the center equiax crystal zone will be reduced or even disappeared when the casting speed achieves to 16 m/min. In addition, the dendritic crystal zone thickness in each side of plate is about 1 nm under different casting speed. Therefore, 2.5 mm is the best thickness under the cooling conditions of the experiments
出处
《辽宁科技大学学报》
CAS
2012年第4期347-351,共5页
Journal of University of Science and Technology Liaoning
关键词
双辊铸轧
镁合金
表面形貌
微观组织
twin-roll casting
magnesium alloyl surface profile
microstructure
