对H18态7075铝合金进行了同步冷却热成形+时效处理,研究了其宏观形貌、回弹角、显微组织和拉伸性能,并与传统冷压成形后的进行了对比,探索了7075铝合金同步冷却热成形的可行性.结果表明:同步冷却热成形工艺适用于7075铝合金,成形后试样的回弹角为0.03°,远低于冷冲压成形后的,且成形后试样不发生翘曲变形;经同步冷却热成形工艺成形后试样的显微组织与传统冷冲压成形+固溶处理后的基本一致,经120 ℃×24 h的时效处理以后,其屈服强度和抗拉强度分别为553.98,635.08 MPa,满足相关标准对T6态7075铝合金的性能要求.
A hot forming process with synchronous cooling followed by aging treatment was conducted on 7075 aluminum alloy in H18 temper, and then the macro morphology, springback angle, microstructure and tensile properties of the alloy were studied and compared with those after traditional cold stamping.The results show that the hot forming with synchronous cooling process can be applied to forming 7075 aluminum alloy.The springback angle of the formed specimen was 0.03°, which was far lower than that after cold stamping.And the formed specimen had no buckling deformation.The microstructure of the formed specimen by hot forming with synchronous cooling was the same as that by the traditional cold stamping followed by solid solution treatment.After aging at 120 ℃ for 24 h, the yield strength and tensile strength were 553.98 MPa and 635.08 MPa, respectively, meeting the performance requirements of 7075 aluminum alloy in T6 temper qualified by the relevant standard.
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