摘要
The automobile suspension parts of a high strength 6xxx aluminum alloy were produced using a novel technique known as near net shape casting for forging stock preparation. Based on the outline dimension of the forging stock, the shape of the ingot was designed as the near net shape and its casting process was studied by the numerical simulation and experimental investigation. The results show that the shrinkage of the ingot was highly correlated to its shape parameters and could be successfully forecast by the stimulation model. The casting parameters of the near net shape ingot were optimized and the near net shape 6xxx aluminum alloy ingots free of defects were cast in the laboratory. In order to obtain high performance forged suspension parts, the hot compression tests of the ingot were carried out. The results show that the subgrain fraction of the forged ingot was strongly affected by Zener-Hollomon parameters （Z parameters）. The intermediate Z parameters, 1.09×10^16 s^-1, will contribute to the larger number fraction of subgrains inside the forged ingot, which contributes to the high performance of the forged products.
采用近终形铸锭配合热锻工艺制备高强6xxx铝合金控制臂。首先设计近终形铝合金锭坯的形状,采用Procast商业软件模拟研究近终形铝合金铸锭的铸造过程。结果表明,近终形铝合金铸锭的收缩行为与铸锭形状相关,经模拟计算优化后,铸造出无缺陷的近终形6xxx铝合金铸锭。为了获得优异的锻件性能,研究了6xxx铝合金的热压缩行为。结果表明,锻件组织中的亚晶百分数与Z参数值相关;中等Z参数(1.09×1016 s-1)有利于获得较高的亚晶百分数,从而保证锻件产品具有更优的性能。
作者简介
Hiromi NAGAUMI; Tel： ＋86-512-88165012; E-mail： changhai bw@sinr.cn
