冷轧覆铝钢热处理后连接强度及成型性分析

Bond strength and formability of annealing treatmenton an aluminum-clad steel sheet

冷轧覆铝钢产品,优于一般的浸蘸、焊接和喷涂产品,且经济实用,但在冷轧过程中,铝钢中间层会产生塑性变形,要提高其成形性需通过热处理消除其加工硬化,而热处理不当又会导致铝钢界面生成脆性铝铁化合物,降低铝钢连接强度,通过实验研究,文章得出了存在一个最佳热处理温度和时间段使得覆铝钢产品有最佳的成型性和连接强度的结论。

The production of an aluminum-clad steel sheet by the rolling process is a more efficient and economical approach compared with the other types of processes utilized for the production of such sheets. In this process, high plastic deformation of two metals, aluminum and steel, is necessary to create the cold bonding between the intermediate surfaces. Therefore, the work-hardened sheet must be annealed in order to obtain a high formability. Heat treatment of the sheet is, however, difficult due to the formation of a brittle intermetallic compound of aluminum and iron at the interface between the layers during heat treatment. In this investigation, the formability of these sheets was measured using the Erichsen cupping test technique. Also, the bond strength was evaluated by macroscopic examination of the surfaces of Erichsen cup specimens. The results indicate that there is an optimum annealing temperature and time leading to a high bonding strength as well as enhanced formability.