Abstract Preheating and rolling process were simultaneously achieved by on-line heating rolling system. The effect of pass reduction on distribution of shear bands and mechanical properties of AZ31 Mg alloys sheet was investigated by analyzing microstructure and texture. With pass reduction increasing, the shear bands become denser and distribute more uniformly. In all rolled sheets, shear bands distribute symmetrically along the middle layer in the side of the sheets. With reduction increasing from 15 % to 50 %, the tilting angle between the shear bands and the rolling direction decrease approximately from 27° to 14°, which is due to the higher velocity difference between surface-layer and middle-layer at higher reduction. In addition, rolled sheets show lower yield strength at higher reduction. The decrease of yield strength is due to the increase of dynamic recrystallization degree and weaker texture at high pass reduction.

中文翻译：

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道次压下量对在线加热轧制AZ31B合金薄板剪切带分布及力学性能的影响

摘要 预热和轧制过程是通过在线加热轧制系统同时实现的。通过显微组织和织构分析，研究了道次压下率对AZ31镁合金板剪切带分布和力学性能的影响。随着道次减少量的增加，剪切带变得更密且分布更均匀。在所有轧制板材中，剪切带沿板材侧面的中间层对称分布。随着压下率从 15% 增加到 50%，剪切带与轧制方向之间的倾斜角大约从 27° 减小到 14°，这是由于在较高压下率下表层和中间层之间的速度差较大。此外，轧制板材在更高的压下量下表现出较低的屈服强度。