6181H18铝合金同步冷却热成形工艺研究

Research on Synchronized Cooling Hot Forming Process of 6181H18 Aluminum Alloy

利用Gleeble3500热/力模拟试验机模拟6181H18铝合金同步冷却热成形工艺,采用正交试验研究工艺参数——变形温度T、保温时间t、冷却速度v对成形性的影响,同时对其微观组织进行了研究。结果表明:同步冷却热成形工艺使6181H18铝合金的成形性能得到明显改善,同时使其成形时效后得到很高的强度,达到了变形和强化同步实现的目的,此工艺可以应用于该铝合金。工艺参数合适的组合为:T=500℃,v=60℃/s,t=220s。成形后α基体中析出大量强化相,但较T4状态强化相略粗大,弥散均匀度略差。

The synchronized cooling hot forming process of 6181H18 aluminum alloy is simulated on Gleeble3500 thermal-mechanical simulator.The influence of the process parameter including:deformation temperature T,holding time t and cooling rate v on formability are investigated by the orthogonal test and the microstructure is analyzed simultaneously.The results show that the synchronized cooling hot forming process can be applied to 6181H18 aluminum alloy which improves the formability of 6181H18 aluminum alloy significantly.At the same time high strength can be obtained after forming.It can meet the purpose of implementing deformation and strengthening in one process step.The proper combination of process parameters are T=500℃,t=220 s,v=60℃/s.A large number of strengthening phases are precipitated from matrix.The strengthening phases are coarser and the dispersed uniformity is a bit worse compared with that of T4 state.