热处理对热轧态4343/3003/4343铝合金复合板材微观组织的影响

doi:10.13251/j.issn.0254-6051.2024.02.017

摘要/Abstract

摘要： 4343/3003/4343铝合金复合板材是一种广泛应用于热传输的复合板材,一般通过热轧进行复合成形制造。然而,热轧后的合金组织均匀性不理想,严重影响后续的冷轧质量,因此,必须建立合理的热处理工艺对热轧态复合板材进行处理。利用光学显微镜和扫描电镜,研究了热处理工艺对热轧态4343/3003/4343铝合金复合板材微观组织的影响规律及机理。结果表明,退火温度、退火时间,以及热轧后冷却速度对复合板材的微观组织存在显著影响。提高退火温度、延长退火时间、减缓热轧后的冷却速度会加速复合板材中析出相的聚合粗化,但是较长时间的退火会导致析出相回溶,不利于后续的冷轧加工。通过试验研究与理论分析,较优的热处理工艺为:退火温度约为500 ℃,退火时间约为4 h,热轧后水冷为较优的冷却方式。

关键词: 热处理, 4343/3003/4343铝合金复合板, 微观组织

Abstract: 4343/3003/4343 aluminum alloy composite plate is widely used in the heat transmission. It is commonly compounded by hot rolling, however, the microstructure uniformity of the alloy after hot rolling is disappointing, which is very unfavorable to the subsequent cold rolling. Therefore, it is necessary to establish a reasonable heat treatment process for the hot rolled composite plate. The effect of heat treatment process on the microstructure of the 4343/3003/4343 aluminum composite plates was studied by means of optical microscope and scanning electron microscope. The results show that the annealing temperature, annealing time, and cooling rate after hot rolling have significant effects on the microstructure of the composite plate. Increasing the annealing temperature, prolongating the annealing time, and slowing down the cooling rate after hot rolling are beneficial to the polymerization/coarsening of the precipitate in the composite plate, but longer annealing time will lead to the redissolution of precipitation, which is not conducive to subsequent cold rolling processing. According to the experiment and theoretical analysis, the optimal heat treatment process is obtained as follows: annealing at about 500 ℃ for about 4 h, and preferring water cooling after the hot rolling.

Key words: heat treatment, 4343/3003/4343 aluminum composite plate, microstructure

中图分类号:

TG146.2

张伟, 陈子健, 蔺永诚. 热处理对热轧态4343/3003/4343铝合金复合板材微观组织的影响[J]. 金属热处理, 2024, 49(2): 113-119.

Zhang Wei, Chen Zijian, Lin Yongcheng. Effect of heat treatment on microstructure of hot-rolled 4343/3003/4343 aluminum composite plate[J]. Heat Treatment of Metals, 2024, 49(2): 113-119.

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