公开(公告)号：US5810949A

公开(公告)日：1998-09-22

申请号：US473827

申请日：1995-06-07

申请人： Dhruba J. Chakrabarti ,  Robert W. Westerlund ,  Bruce A. Halter

发明人： Dhruba J. Chakrabarti ,  Robert W. Westerlund ,  Bruce A. Halter

IPC分类号： C22C1/057

CPC分类号： C22C1/02

摘要： A method is disclosed for treating an aluminum alloy product in order to impart a fine grain structure and thereby improve formability and surface finish characteristics. According to this method, the product is first heated to a first temperature high enough to dissolve soluble constituent phase particles into solid solution. The product is maintained at this first temperature long enough to dissolve a major portion of the soluble constituent phase particles. Thereafter, the product is subjected to a controlled cooling process. The product is first cooled from the first temperature, at a first rate that is rapid enough to minimize the precipitation of coarse-grained constituent phase particles, to a second temperature that is below the temperature at which such coarse-grained constituent phase particles will precipitate out. Then, the product is cooled from the second temperature, at a second rate that is within a range of about 1-300 degrees F. per hour, to a third temperature that is at least 50 degrees F. below the second temperature. After the temperature of the product has been reduced to the third temperature, the product is cold worked. After cold working, the temperature of the product is raised to a fourth temperature sufficient to cause recrystallization of the product. The product so treated will exhibit improved formability and surface characteristics, and may exhibit an average grain size of less than about 30 microns.

摘要翻译： 公开了一种用于处理铝合金产品以提供细晶粒结构，从而提高成形性和表面光洁度特性的方法。 根据该方法，首先将产物加热到足够高的第一温度以将可溶组分相颗粒溶解成固溶体。 产物在该第一温度下保持足够长的时间以溶解主要部分的可溶性组成相颗粒。 此后，对产品进行受控制的冷却过程。 首先将产物从第一个温度以足够快的速度将粗粒子组成相颗粒的沉淀最小化到低于这种粗粒组成相颗粒将沉淀的温度的第二温度 出来 然后，将产品从第二温度以约1-300°F /小时的第二速率冷却至低于第二温度至少50°F的第三温度。 产品的温度降低到第三个温度后，产品冷加工。 冷加工后，将产品的温度升至足以引起产品再结晶的第四温度。 如此处理的产品将具有改进的成形性和表面特性，并且可以显示出小于约30微米的平均晶粒尺寸。