复合锭直接水冷半连续铸造过程的研究

Study on the Direct-Chill Semi-continuous Casting Process of Composite Ingot

在传统结晶器中安装了冷却板,采用直接水冷半连续铸造法实现了用于生产钎焊板的铝合金复合锭的实验室制备,并对半连续铸造过程及工艺进行研究,主要研究了铸造过程中接触面附近温度场分布、复合锭接触面两侧的宏观形貌、微观组织及成分分布、硬度分布.结果表明:在冷却板的作用下接触面附近形成了一层具有一定厚度的半固态层,从而保证复合铸造过程的顺利实现,复合锭中两种铝合金接触面结合较好,且为一种冶金结合,接触面两侧的成分分布和硬度分布有较好的对应关系.

With a cooling plate mounted in the traditional mold,the composite aluminum alloy ingot for making brazing sheet was prepared in lab by the direct-chill（DC） semi-continuous casting process,and such a process was investigated involving mainly temperature field distribution near the contact interface between two different aluminum alloys during DC casting,macro-morphology,microstructure and distributions of both components and hardness of the composite ingot.The results showed that the semi-solid layer with a certain thickness is formed under the action of cooling plate in the vicinity of the contact interface,thus ensuring the successful implementation of casting the composite ingot,where the two different aluminum alloys are well bonded together metallurgically.It was found that the distributions of components and hardness of the two different aluminum alloys in the composite ingot are in corresponding relation.