汽车用5754-O铝合金板材制备及组织性能研究

Study on Preparation and Microstructure and Properties of 5754-O Aluminum Alloy Sheet of Automobile

摘要: 本实验采用“1 + 4”热连轧、2800冷轧生产线通过不同工艺路线制备了汽车用5754-O铝合金板材，研究了不同冷轧加工率及成品退火温度对板材组织和性能的影响。结果表明，适当加工率板材畸变能较低，完全再结晶态材料延伸率提升明显。两种板材随退火温度上升强度下降，塑性上升。中间退火可消除加工硬化，板材更符合深冲加工要求。实验与生产性能具有差异性，参考生产数据优化至350℃保温4 h。板材性能：抗拉强度207 MPa，屈服强度113 MPa，延伸率26%，杯凸9.04 mm，n值0.28，r值0.81。

Abstract: 5754-O aluminum alloy sheet for automobile was prepared by “1 + 4” hot strip rolling and 2800 cold rolling mill in this experiment. The effects of different cold rolling rate and annealing tem-perature on the microstructure and properties of sheets by different processes were studied. The results show that the plate distortion energy of the appropriate processing rate is lower, and the elongation rate of the completely recrystallized material is obviously improved. The strength of the two sheets decreases with increasing annealing temperature and plasticity increases. Intermediate annealing can interrupt work hardening, and the sheet is more in line with deep drawing requirements. The experiment and the production performance have the difference, the reference production data are optimized to 350˚C heat preservation 4 h. Sheet properties: tensile strength 207 MPa, yield strength 113 MPa, elongation 26%, cup convex 9.04 mm, n value 0.28, r value 0.81.