钎焊用薄铝层铝/钢复合带材的临界压下量

Effect of Cold Rolling Reduction on Performance of Thin Aluminum Clad Steel Strips for Brazing

通过钎焊后拉剪实验得到了不同压下量下铝/钢复合界面的结合强度,用扫描电镜观察了不同压下量下的铝/钢复合材料拉剪断口的形貌,并用能谱仪分析了拉剪断口上的元素。根据拉剪强度并结合断口形貌,定义了钎焊用冷轧4A60铝/08Al钢复合材料的最小复合压下量为35%,稳定复合压下量为50%。

Thin 4A60 Al-alloy clad 08Al-steel strips were made by cold rolling with different reduction rates. The clad strips were then brazed with a thin film of 3003 Al-alloy. The interfacial bonding strength of aluminum to steel was evaluated by tensile shearing test in order to determine critical rolling reduction of thin aluminum clad steel sheets. The fracture morphology and element distribution were observed and analyzed by means of scanning electron microscope(SEM), energy dispersive spectrometer(EDS), respectively. Finally, a minimum bonded reduction of 35% was suggested and the stable reduction of 50%was proposed based on the measured bonding strength and the observed fracture morphology.