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对Al-Si/Al-Mn复合连铸坯料通过不同热处理温度和保温时间进行了均匀化热处理研究,并对均匀化热处理后的微观组织、硬度和微观成分分布进行了分析。结果表明:Al-Si/Al-Mn复合连铸坯料经过均匀化热处理后,Al-Si合金一侧的微观组织由粗大的网状结构转化成点状或短棒状混合组织,Al-Mn合金一侧微观组织趋于均匀一致,复合界面处的界限更加明显;均匀化热处理后Al-Si合金硬度有明显下降,但对Al-Mn合金的影响较小;微观元素分布分析表明均匀化热处理后溶质元素更加均匀,在复合界面处溶质元素出现互扩散现象,特别是Mg元素扩散后复合界面模糊;综合分析表明,Al-Si/Al-Mn复合连铸坯料在480℃保温15 h后效果最佳。
The homogenization heat treatment of Al-Si / Al-Mn composite cast billet through different heat treatment temperature and holding time was carried out. The microstructure, hardness and microstructure distribution of homogenized heat treatment were analyzed. The results show that the microstructure of the Al-Si alloy is transformed from a coarse network structure into a dot-like or short rod-like mixed structure after Al-Si / Al-Mn composite continuous casting billets are homogenized. The microstructure of the Al-Si alloy tends to be uniform and the boundary at the composite interface becomes more obvious. The hardness of the Al-Si alloy decreases obviously after homogenization heat treatment, but it has little effect on the Al-Mn alloy. The microscopic elemental distribution analysis shows that the homogenization heat treatment solute The elements are more uniform and the solute elements are interdiffusion at the composite interface, especially the composite interface is blurred after the diffusion of Mg element. The comprehensive analysis shows that the Al-Si / Al-Mn composite continuous casting billets have the best effect after being incubated at 480 ℃ for 15 h .