锻压技术

冷轧和退火方式对2×××系航空铝合金薄板显微组织的影响

英文标题：Influence of cold rolling and annealing methods on microstructure of 2××× series aviation aluminium alloy sheet

单位：1. 山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心 2. 烟台南山学院材料科学与工程学院

分类号：TG146.2

出版年,卷(期):页码：2025,50(8):185-197

摘要：

利用金相显微镜和扫描电子显微镜研究了冷轧工艺和退火方式对2024航空铝合金薄板组织和晶粒尺寸的影响。结果表明，2024铝合金冷轧板中存在含Mn的Al7Cu2Fe相、S相和少量的θ相。经过退火处理后，合金中相的种类、分布、形貌与冷轧板中的差异不大；T42处理后，合金中的可溶相大量溶解，第二相的面积分数迅速减小，且第二相的平均尺寸增加。冷轧板退火后发生完全再结晶，双退火处理板材的再结晶晶粒明显小于正常退火处理；经过正常退火+T42处理后，2道次轧制的板材平均晶粒尺寸最小，而对于经过双退火+T42处理后的板材，4道次轧制的平均晶粒尺寸最小，晶粒度级别数为9.05。此外，在不同压下量的板材中，轧后厚度为0.8 mm的板材经过双退火+T42处理后的平均晶粒尺寸最小，其晶粒度级别数达到9.27。

The influences of cold rolling process and annealing method on the microstructure and grain size of 2024 aviation aluminium alloy sheet were investigated by metallographic microscope and scanning electron microscope. The results indicate that Mn-containing Al7Cu2Fe phase, S phase and a small amount of θ phase are present in 2024 aluminium alloy cold-rolled sheets. After annealing treatment, the types, distribution and morphology of phases in the alloy show little difference compared with those in cold-rolled sheets. After T42 treatment, a large amount of soluble phase in the alloy is dissolved, the area fraction of the second phase decreases rapidly, and the average size of the second phase increases. Complete recrystallization occurs in the cold-rolled sheets after annealing, the recrystallized grains of the double-annealed sheet are significantly smaller than those of the normal-annealed sheet. After normal annealing+T42 treatment, the sheet rolled in two passes has the smallest average grain size. For the sheet treated by double annealing+T42 treatment, the sheet rolled in four passes has the smallest average grain size, with a grain size grade of 9.05. In addition, among the sheets with different reduction amounts, the rolled sheet with the thickness of 0.8 mm has the smallest average grain size after double annealing+T42 treatment, and its grain size grade reaches 9.27.

基金项目：

作者简介：王永红（1986-），女，硕士，工程师 E-mail：2645138291@qq.com

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