高强铝合金高效热冲压工艺研究进展

Research progress on high efficiency hot stamping process for high strength aluminum alloy

热冲压技术解决了高强铝合金成形困难、回弹大的问题,但由于固溶和时效时间较长且与成形节奏不匹配而使得其难以进行工业化应用。从快速固溶、停放效应和短时时效等方面介绍并讨论了高强铝合金高效热冲压工艺的研究进展,提出高效热冲压工艺及流程控制。结果表明:固溶应选择较高温度并采用强对流加热或接触加热,可在5 min内完成;6000系高强铝合金淬火后应尽快时效;时效应采用具有短时预时效工艺的多级时效,现有预时效可在1 h内完成。最后,对短时时效工艺进行了展望,认为还需从添加合金元素的方面着手进一步降低时效时间,并在此基础上对抗应力腐蚀和疲劳性能做出研究。

Hot stamping technology solves the problems of forming difficulties and large springback for high strength aluminum alloy,but it is difficult to industrialize due to the long solution time and aging time as well as the mismatch with the forming rhythm. Therefore,the research progress on high efficiency hot stamping process of high strength aluminum alloy was introduced and discussed from fast solution,parked effect and short-time aging,and the high efficiency hot stamping process and process control were proposed. The results show that the solution chooses higher temperature and uses strong convection heating or contact heating,which is completed within five minutes,and the anging of high strength aluminum alloy for 6000 series is carried out immediately after quenching. Furthermore,multi-stage aging with a shorter time pre-aging process is used in aging process,and existing pre-aging is done in 1 h. Finally,the short-time aging process is prospected,and it is believed that the aging time is further reduced by adding alloy elements. Thus,on this basis,the stress corrosion resistance and fatigue performance were studied.