摘要
通过连续检测半连铸AZ80镁合金锭坯凝固过程中温度的连续变化,研究了半连铸工艺对镁合金锭坯凝固过程中传热行为的影响规律,并通过对相应铸锭凝固组织的宏观分析,研究半连铸工艺对凝固组织的影响。结果表明,随铸造速度的提高,液穴深度加深,但影响变小,同时两相区中心的曲率半径增大,中心与边部的温度场差别增大。但在二次冷却水较小的情形下,随铸造速度的提高,这种影响减小。提高铸造速度和加大二次冷却水量都可以减小靠近锭坯中心的柱状晶区域,减小组织差别,获得组织一致的锭坯。
The effects of semi - continuous casting process on the heat transfer behavior of magnesium alloy ingot during solidification process were studied by detecting the continuous change of temperature of solidification process of AZ80 magnesium alloy ingot, and the effects on solidification macrostructure were also studied. The results show that the sump depth increases with the increasing of casting speed, but the influence becomes smaller, and the radius of curvature of the center of the two phase region increases, and the temperature difference between the center and the edge also increases. However, as casting speed increased, the influence decreases with small amount of the second cooling water. Increasing the casting speed and the amount of cooling water can reduce the columnar crystal region near the center of the ingot, reduce the difference of the microstructure, and obtain uniform ingot.
作者
刘世玺
Liu Shixi(Editorial Section of Journal, Baotou Vocational ＆ Technical College, Baotou, Inner Mongolia 014035)
出处
《包头职业技术学院学报》
2017年第1期9-12,共4页
Journal of Baotou Vocational & Technical College
基金
包头职业技术学院2015年度院级科研项目"镁合金传热与凝固研究"阶段性成果
关键词
AZ80镁合金
半连铸
传热
宏观组织
AZ80 magnesium alloy
semi - continuous casting
heat transfer
macrostructure
