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针对连续挤压-冷轧铜板带工艺,分析14mm×290mm的纯铜板坯及其冷轧轧制变形量分别为70%、89%(含退火)共4种铜板的显微组织结构和力学性能。结果表明,挤出板坯的横纵截面组织均为均匀的等轴晶粒,并存在少量的孪晶。随着轧制变形量的增加,纵截面开始逐渐形成冷轧纤维流线,而横截面则形成变形织构,组织不均匀。当轧制变形量达到89%时,板的延伸率低于5%,不利于后续精轧。经退火后重新形成均匀细小的等轴晶粒,延伸率提高到50%以上。板的抗拉强度随变形量的增加而变大,塑性降低,铜板产生了各向异性。
According to the process of continuous extrusion-cold-rolled copper strip, the microstructure and mechanical properties of four kinds of copper plates with 14mm × 290mm pure copper slab and their cold rolling deformation were respectively 70%, 89% (including annealing) were analyzed . The results show that the cross-section of the extruded slab is uniform equiaxed grains, and there is a small amount of twins. With the increase of rolling deformation, the longitudinal section begins to gradually form the cold-rolled fiber streamline, while the cross-section is deformed texture, the organization is not uniform. When the amount of rolling deformation reaches 89%, the elongation of the plate is less than 5%, is not conducive to the subsequent finishing rolling. Annealed to form uniform and fine equiaxed grains, the elongation increased to 50% or more. Tensile strength of the board increases with the amount of deformation and plasticity decreases, the anisotropy of the copper plate.