(东北大学 材料与冶金学院, 沈阳 110006)
摘 要: 利用自行设计的单辊剪切/冷却(SCR)试验机对LY11合金进行了半固态凝固实验,研究了工艺条件对LY11半固态合金组织的影响。结果表明,辊-靴间隙宽度的适当范围为2~3 mm;浇注温度影响半固态合金坯料内部晶粒的大小与形状,浇注温度在730~750 ℃范 围内,可获得细小、均匀球状或椭球状晶粒组织;冷却方式会影响半固态合金坯料晶粒的大小与分布,水冷制得的合金晶粒尺寸比空冷的小2~3个级别,而空冷制得半固态合金坯料的晶粒分布较为均匀。
关键字: 剪切; 半固态合金; 浇注温度; 冷却
semi-solid LY11 alloy during
single-roll shearing/cooling process
(Institute of Materials and Metallurgy, Northeastern University,
Shenyang 110006, P.R.China)
Abstract:A self-made single-roll shearing/cooling (SCR) machine was used to manufacture semi-solid LY11 alloy. Effect of processing factors on the micorstructures were studied. The results show that the optimum gap between roll and shoe varies in 2~3 mm; pouring temperature can affect grain size and its shape of semi-solid alloy. When cast at 730~750 ℃, fine and even grains with spherical or elliptical structures can be obtained. Cooling style can affect grain size and distribution. Grain size of alloy produced from water-cooling is 2~3 level smaller than that from air-cooling, but grains produced from air-cooling are even.
Key words: shearing; semi-solid alloy; pouring temperature; cooling