異なるパススケジュールで冷間圧延した純アルミニウム板における集合組織の板厚内分布と材料特性

抄録

Effect of the cold rolling pass schedule on mechanical properties and through-thickness texture gradients in 1050 aluminum sheets has been investigated with a commercial rolling mill. As the total reduction of cold rolling after the intermediate annealing was fixed at 75%, 2 passes rollings with reductions of 50%+50%, 55%+44% and 60%+38% were applied to 1.2 mm thick coil strips, and compared with 3 passes rolling of 42%+35%+33%. In the three cases of 2 passes rolling, texture gradients are similar each other and the β-fiber densities are maximum at the 50 μm inner layer as compared with the case of 3 passes rolling in which β-fiber densities are higher at every inner layer and the maximum is in the central layer of the thickness. Weak shear texture components of ‹111›||ND are recognized in the surface and 50 μm inner layer of the sheets rolled with 2 passes and in all layers that is from the surface to the central layer of the sheet rolled with 3 passes. Tensile strength changes little, however, the uniform elongation, the fracture angle in tensile specimen and the electric resistively are different with the rolling condition. The fraction of 45° ears in a drawn cup is slightly larger in the sheet by 3 passes rolling, but the differences of ears disappear after the annealing at 723 K.