不同热处理状态下成形速率对2219铝合金成形极限的影响

Influence of forming rate on forming limit of 2219 aluminum alloy under different heat treatment conditions

分别对完全退火态和固溶淬火态2219铝合金板材进行准静态成形条件和电磁成形条件下的单向拉伸实验、平面应变实验和双向拉伸实验,建立了2219铝合金的成形极限图并研究了不同热处理状态下成形速率对2219铝合金成形极限的影响规律。结果表明,固溶淬火会显著提高2219铝合金的强度,降低2219铝合金的断后伸长率;准静态成形条件下,完全退火态2219铝合金在以上三种典型应变状态下的极限应变比固溶淬火态2219铝合金分别高14.76%、37.98%、39.54%;电磁成形条件下,完全退火态2219铝合金在以上三种典型应变状态下的极限应变比固溶淬火态2219铝合金分别高14.51%、38.03%、33.33%;完全退火态2219铝合金在电磁成形条件下以上三种典型应变状态下的极限应变比准静态成形条件下分别高16.08%、24.38%、18.76%;固溶淬火态2219铝合金在电磁成形条件下以上三种典型应变状态下的的极限应变比准静态成形条件下分别高16.34%、24.20%、30.94%,电磁成形可有效提高2219铝合金的成形极限,改善2219铝合金的成形性能。

The uniaxial tensile,plane strain and biaxial tension experiments on 2219 aluminum alloy sheet in fully annealed state and solid solution hardening state were conducted under quasi-static forming and electromagnetic forming conditions respectively,the forming limit diagram of 2219 aluminum alloy was established and the forming limit influence law of 2219 aluminum alloy under different heat treatment conditions and forming rates was researched. The results show that the solid solution hardening can significantly increase the strength and reduce the elongation of rupture. The ultimate strain of fully annealed state for quasi-static forming respectively increases by 14. 76%,37. 98%,39. 54% than that of solid solution hardening state in the above three typical strain states; the ultimate strain of fully annealed state for electromagnetic forming respectively increases by 14. 51%,38. 03% and 33. 33% than that of solid solution hardening state in the above three typical strain states; the ultimate strain of full annealed state for electromagnetic forming respectively increases by 16. 08%,24. 38% and18. 76% than that for quasi-static forming in the above three typical strain conditions; the ultimate strain of solid solution hardening state for electromagnetic forming respectively increases by 16. 34 %,24. 20% and 30. 94% than that for quasi-static forming in the above three typical strain conditions. The electromagnetic forming can effectively improve the forming limit and formability of 2219 aluminum alloy.