电站空冷系统用预覆钎料铝钢复合带材的开发

摘要

The brazing layer of 4343 aluminum alloy was hot rolled with cladding layer of 4A60 aluminum alloy.The as-rolled sheet and 08Al steel were cold rolled at a single-pass deformation of 50% by the rolling mill with diameter of 420 mm and annealing treated at 520 ℃ for 24 h,then the aluminum-steel cladding strip with pre-cladded brazing layer,used in air cooling system,was prepared and the microstructure and mechanical properties were studied.The results show that the microstructure of 08Al steel layer was consisted of recrystallized ferrite.The yield strength of the cladding strip was above 250 MPa,the tensile strength was 305 MPa and the elongation was more than 30%.After the cladding strip was brazed at 608 ℃ for 20 min,IMC (Intermetallic Compound)at aluminum-steel interface was not found.The brazed cladding strip was fractured in the layer of 4A60 aluminum alloy in tensile-shear test and the delamination was not observed at the interface between 4A60 aluminum alloy and 08Al steel.%将钎料层材料4343铝合金和包覆层材料4A60铝合金进行热轧复合,然后与08Al 钢在张力条件下通过ϕ420 mm 轧机进行50％的单道次冷轧复合,随后在罩式退火炉中进行520℃×24 h的退火处理,得到电站空冷系统用预覆钎料铝钢复合带材,并对其组织与性能进行了研究。结果表明：预覆钎料铝钢复合带材中08Al 钢的组织为再结晶铁素体；复合带材的屈服强度大于250 MPa,抗拉强度为305 MPa 左右,伸长率大于30％；在608℃保温20 min 钎焊后铝钢界面未发现金属间化合物,拉剪时断裂发生在4A60铝合金层上,铝钢界面未发生分层。