冷轧变形量对电磁/超声铸轧铝板织构和性能的影响

摘要

在电磁和超声外场下成功制备铸轧铝带坯,并对其进行冷轧实验,研究了冷轧变形量对复合能场铸轧铝板的微观组织、力学性能和织构的影响,并与相同道次的普通铸轧铝板进行对比.研究结果表明:随着冷轧变形量的增加,两种铸轧铝板的晶粒逐渐被压扁和拉长,最终获得明显的纤维组织,其中复合能场铸轧板的组织更加均匀；复合能场铸轧板各道次的抗拉强度σb和伸长率δ均高于同道次的普通铸轧板,各向异性指数(IPA)明显小于普通铸轧板；随着冷轧变形量的增加,两种铸轧板的黄铜(B)、S及铜(C)织构的密度出现不同程度的增加,而高斯织构(G)先增后减,旋转立方织构(RC)逐渐减少,其中复合能场铸轧板的原始织构较漫散,相同道次的各织构密度较低.冲杯实验结果表明:复合能场铸轧板的深冲性能明显优于普通铝板,其制耳率仅为1.7％.%Cast-rolled aluminum strip stock had been successfully prepared under electromagnetic and ultrasonic field,and cold rolling experiment was conducted for the strip stock.The effect of cold rolling reduction on the microstructure,mechanical properties and texture of cast-rolled aluminum strip under composite energy field was investigated,and compared with general cast-rolled aluminum strip of the same pass.The results show that:With the increase of cold rolling reduction,the two kind of cast-rolled aluminum strip was gradually flattened and elongated,and eventually the apparent fibrous tissue was obtained.And the fibrous tissue of cast-rolled strip under composite energy field was more uniform.The tensile strength σb and elongation δ of each pass of cast-rolled strip under composite energy field were both higher than the general cast-rolled strip at the same pass,and the anisotropy index (IPA) was significantly lower than the general one.With the increase of cold rolling reduction,the density of Brass (B),S and Copper (C) texture of the two kind of cast-rolled aluminum strip was increased at different degrees,while the Goss (G) texture first increased and then decreased,the rotated-cube (RC) texture gradually decreased.The original texture of cast-rolled strip under composite energy field was diffused and the density of all kinds of texture with the same pass was lower than the general one.The drawing experimental results show that the draw ability of cast-rolled strip under composite energy field was obviously better than the general one,and the earing ratio was only 1.7％.