Development of Aluminum-Steel Cladding Strip with Pre-Cladded Brazing Layer Used in Air Cooling System of Power Plants
摘 要
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420 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。
Abstract
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.
中图分类号 TG335.8 DOI 10.11973/jxgccl201510005
所属栏目 试验研究
基金项目 国家高技术研究发展计划(863)项目(2013AA031301); 国家国际科技合作专项资助项目(2013DFB50170); 江苏省重点实验室资助项目(BM2014006)
收稿日期 2014/9/28
修改稿日期 2015/7/13
网络出版日期
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备注李龙(1977-), 男, 内蒙古乌兰察布人, 高级工程师, 博士。
引用该论文: LI Long,ZENG Xiang-yong,CHEN Xin,GAO Chuang,ZHANG Xiao-jun,ZHOU De-jing. Development of Aluminum-Steel Cladding Strip with Pre-Cladded Brazing Layer Used in Air Cooling System of Power Plants[J]. Materials for mechancial engineering, 2015, 39(10): 21~24
李龙,曾祥勇,陈鑫,高闯,张小军,周德敬. 电站空冷系统用预覆钎料铝钢复合带材的开发[J]. 机械工程材料, 2015, 39(10): 21~24
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参考文献
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【2】袁鸽成, 朱兆华, 胡文韬, 等.温度对不锈钢/铝/不锈钢层状材料轧制复合行为的影响[J].机械工程材料, 2004, 28(2): 24-26.
【3】袁鸽成, 杨安宸, 娄燕雄.Al-Sn-Si/Al/steel层状复合材料的变形复合行为及机理[J].机械工程材料, 2002, 26(10): 30-34.
【4】马韬. 直接空冷管束复合带材的研究[J]. 电站辅机, 2013, 34(3): 5-8.
【5】周德敬, 陈智, 张新明, 等. Si含量对轧制复合铝钢层状复合材料界面化合物组织形貌的影响[J]. 金属热处理, 2014, 39(1): 42-48.
【6】KAWASE H, MAKIMOTO M, TAKAGI K, et al. Development of aluminum clad steel by roll bonding[J]. Trans ISIJ, 1983, 23: 628-632.
【7】路王珂, 谢敬佩, 王爱琴, 等.退火温度对铜铝铸轧复合板界面组织和力学性能的影响[J].机械工程材料, 2014, 38(3): 14-17.
【8】DANESH MANESH H, KARIMI TAHERI A. The effect of annealing treatment on mechanical properties of aluminum clad steel sheet[J]. Materials and Design, 2003, 24: 617-622.
【9】雍岐龙. 钢铁材料中的第二相[M]. 北京: 冶金工业出版社, 2006: 14-15.
【10】SPRINGER H, KOSTKA A, PAYTON E J, et al. On the formation and growth of inter-metallic phases during inter-diffusion between low-carbon steel and aluminum alloys[J]. Acta Materialia, 2011, 59(4): 1586-1600.
【11】KOBAYASHI S, YAKOU T. Control of intermetallic compound layers at interface between steel and aluminum by diffusion-treatment[J]. Materials Science and Engineering: A, 2002, 338(1): 44-53.
【12】HWANG Weng-sing, Effects of Heat Treatment on Mechanical Property and Microstructure of Aluminum-Stainless Steel Bimetal Plate[J]. Journal of Engineering Materials and Technology, 2012, 134(1): 1-6.
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