两道次热轧法制备钢/铝复合板的结合性能研究

Study on Binding Property of Steel/Aluminum Laminated Sheets Fabricated by Two-pass Hot Rolling

试验采用热轧法制备薄钢/铝复合板,研究了压下量、轧制温度和保温时间对复合板界面组织和接合强度的影响规律。结果表明,板材的接合强度随轧制温度和压下量的增加先增大后减小。当采用一道次热轧时,界面接合性较差,经过退火后,通过SEM和EDS分析发现,板材界面处产生FeAl、FeAl3和Fe2Al5等金属间化合物层,导致接合强度降低。采用两道次轧制工艺:第1道次温度为300℃,保温时间为30min,压下量为40%下轧制;第2道次温度为600℃,保温时间为10min,压下量为85%下轧制时,界面上未产生中间化合物,接合良好,经测试最大接合强度达60 MPa。热处理工艺对试样接合强度有明显影响,试样的接合强度随加热温度的升高和保温时间的延长先增大后减小。

Thin steel/Al laminated sheets are fabricated by hot rolling; the effects of reduction, rolling temperature and heat treatment on the bonding strength and interface tissue of steel/Al laminated sheets are studied. The results show that the bonding strength of the laminated sheets increases firstly but decreases later with the increasing rolling temperature and reduction. During the one-pass hot rolling, the binding property of interface is weak. FeA1, FeA13 and Fe2 Als generated on the interface after annealing observed by SEM and EDS, which decrease the bonding strength. After the two-pass hot roll- ing （In the first-pass, it is heated at 300 ℃ for 30 min and reduction of 40% ; In the second-pass; it is heated at 600 ℃ for 10 min and reduction of 85%）, there are no intermetallics came into being on the interface and bonded well of the sheets, and the maximum tested bonding strength is nearly 60 MPa. In addition, heat treatment has a great influence on the bonding strength; the bonding strength increases firstly but decreases later with the increasing heat temperature and holding time.