钢/铝添加粉末激光焊接头界面组织与性能
|
摘要
基于密度泛函理论的第一性原理,利用层技术构建钢/铝激光焊接的Fe/Al界面模型,研究金属原子X(X=Sn,Sr,Zr,Ce,La)置换Fe/Al界面模型中Fe(Al)原子的合金形成热及其体系电子结构。结果表明:Sn,Sr,Ce优先置换Fe/Al界面处的Al原子,而La,Zr优先置换Fe/Al界面处的Fe原子,合金化促进Fe/Al界面电子在不同轨道之间的转移,增强Fe-Al的离子键性能,提高Fe/Al界面结合能力,改善Fe/Al界面的脆性断裂,其中Sn的合金化效果最显著。在此基础上,进行1.4mm厚DC51D+ZF镀锌钢和1.2mm厚6016铝合金试件添加Sn,Zr粉的激光搭接焊实验,结果显示:添加粉末可促进焊接熔池的流动性,改变接头界面成分和显微组织,添加Sn粉激光焊钢/铝接头的抗拉强度327.41MPa,伸长率22.93%,较添加Zr粉和未添加粉末有了明显提高。
Based on first-principles density functional theory,the Fe/Al interface model of steel/aluminum laser welding was constructed by layer technique.The Fe/Al interface was studied by metal atom X(X=Sn,Sr,Zr,Ce,La).The results show that Sn,Sr and Ce preferentially displace the Al atoms at the Fe/Al interface,while La and Zr preferentially displace the Fe atoms at the Fe/Al interface.Alloying promotes the transfer of Fe/Al interfacial electrons between different orbits,enhances the ionic bond properties of Fe-Al,improves the Fe/Al interface binding capacity,improves the brittle fracture of Fe/Al interface,and the alloying effect of Sn most notable.On the basis of this,the laser lap welding test of Sn and Zr powder was carried out on 1.4mm thick DC51D+ZF galvanized steel and1.2mm thick 6016 aluminum alloy specimen.The results show that the addition of powder can promote the flowability of the molten bath and change the composition and microstructure of the joint interface.The tensile strength of the steel/aluminum joint is 327.41 MPa and the elongation is 22.93%with the addition of Sn powder,which is obviously improved compared with the addition of Zr powder and without the addition of powder.
Based on first-principles density functional theory,the Fe/Al interface model of steel/aluminum laser welding was constructed by layer technique.The Fe/Al interface was studied by metal atom X(X=Sn,Sr,Zr,Ce,La).The results show that Sn,Sr and Ce preferentially displace the Al atoms at the Fe/Al interface,while La and Zr preferentially displace the Fe atoms at the Fe/Al interface.Alloying promotes the transfer of Fe/Al interfacial electrons between different orbits,enhances the ionic bond properties of Fe-Al,improves the Fe/Al interface binding capacity,improves the brittle fracture of Fe/Al interface,and the alloying effect of Sn most notable.On the basis of this,the laser lap welding test of Sn and Zr powder was carried out on 1.4mm thick DC51D+ZF galvanized steel and1.2mm thick 6016 aluminum alloy specimen.The results show that the addition of powder can promote the flowability of the molten bath and change the composition and microstructure of the joint interface.The tensile strength of the steel/aluminum joint is 327.41 MPa and the elongation is 22.93%with the addition of Sn powder,which is obviously improved compared with the addition of Zr powder and without the addition of powder.
引文
[1]ZHANG Y Q,FU H R,SUN N Y,et al.Spin hall magnetoresistance in an ultrathin Co2-FeAl system[J].Journal of Magnetism and Magnetic Materials,2016,411(1):103-107.
[2]BASAK S,DAS H,PALT K,et al.Characterization of intermetallics in aluminum to zinc coated interstitial free steel joining by pulsed MIG brazing for automotive application[J].Materials Characterization,2016,112(4):229-237.
[3]EZAZI M A,YUSOF F,SARHAN A A D.Employment of fiber laser technology to weld austenitic stainless steel 304lwith aluminum alloy 5083using pre-placed activating flux[J].Materials&Design,2015,87(3):105-120.
[4]BORISOVA A L,TIMOFEEVA I I,VASIL M A.Structural and phase transformations in Fe-Al intermetallic powders during mechanochemical sintering[J].Powder Metallurgy and Metal Ceramics,2015,54(7/8):490-496.
[5]LIU W,MA J,ATABAKI M M,et al.Joining of advanced highstrength steel to AA 6061alloy by using Fe/Al structural transition joint[J].Materials&Design,2015,68(5):146-157.
[6]张秉刚,何景山,曾如川.LF2铝合金与Q235钢加入中间Cu层电子束焊接接头组织及形成机理[J].焊接学报,2007,28(6):37-42.ZHANG B G,HE J S,ZENG R C,et al.Microstructures and formation of EBW joint of aluminum alloy LF2to steel Q235 with transition metal Cu[J].Transactions of the China Welding Institution,2007,28(6):37-42.
[7]MATHIEU A,PONTEVICCI S,WIALA J C,et al.Laser brazing of a steel/aluminium assembly with hot filler wire(88%Al,12%Si)[J].Materials Science and Engineering:A,2006,19(28):435-436.
[8]周惦武,田伟,彭利,等.镀锌钢/铝添加中间夹层Cu、Pb的激光搭接焊研究[J].稀有金属材料与工程,2014,43(5):1181-1186.ZHOU D W,TIAN W,PENG L,et al.Laser lap welding of steel and aluminum alloy with Cu,Pb metal sandwich addition[J].Rare Metal Materials and Engineering,2014,43(5):1181-1186.
[9]张丽娟,周惦武,刘金水,等.钢/铝异种金属添加粉末的激光焊接[J].中国有色金属学报,2013,23(12):3401-3409.ZHANG L J,ZHOU D W,LIU J S,et al.Laser welding of steel/aluminum dissimilar metal with power addition[J].The Chinese Journal of Nonferrous Metals,2013,23(12):3401-3409.
[10]周惦武,李宁宁,刘元利,等.胶层辅助激光焊双相钢/铝合金接头显微组织与力学性能[J].中国有色金属学报,2015,25(9):2381-2388.ZHOU D W,LI N N,LIU Y L,et al.Microstructure and mechanical properties of dual phase steel/aluminum alloy laser welding with adhesive layer addition[J].The Chinese Journal of Nonferrous Metals,2015,25(9):2381-2388.
[11]蒋淑英,李世春.Al/Fe液-固界面扩散反应层生长动力学分析[J].材料工程,2015,43(5):62-66.JIANG S Y,LI S C.Growth kinetics analysis on diffusion reaction layer in Al/Fe liquid-solid interface[J].Journal of Materials Engineering,2015,43(5):62-66.
[12]彭艳,周惦武,徐少华,等.钢/铝异种金属激光焊接Fe/Al界面微合金化的第一性原理研究[J].稀有金属材料与工程,2012(增刊2):302-306.PENG Y,ZHOU D W,XU S H,et al.First-principles studies of the effects of microalloy elements on Fe/Al interface for laser lap welding of steel and aluminum[J].Rare Metal Materials and Engineering,2012(Suppl 2):302-306.
[13]QI Y,HECTOR L G,OOI N,et al.A first principles study of adhesion and adhensive transfer at Al(111)/graphite(001)[J].Surface Science,2005,581(3):155-168.
[14]KWAK B W,KIM D K,KIM B S.Effect of FeAl on mechanical properties and consolidation of nanostructured(W,Ti)C by the high frequency induction heating[J].Materials Transactions,2015,56(11):1915-1918.
[15]MECO S,PARDAL G,GANGULY S,et al.Application of laser in seam welding of dissimilar steel to aluminium joints for thick structural components[J].Optics and Lasers in Engineering,2015,67(4):22-30.
[16]KANT R,PRAKASH U,AGARWALA V.Wear behaviour of an FeAl intermetallic alloy containing carbon and titanium[J].Intermetallics,2015,61(5):21-26.
[17]FORNALCZYK A,CEBULSHI J,DOROTA P.The morphology of corrosion products in FeAl alloys after heat-resistance tests at different temperatures[J].Solid State Phenomena,2015,227(7):409-412.
[2]BASAK S,DAS H,PALT K,et al.Characterization of intermetallics in aluminum to zinc coated interstitial free steel joining by pulsed MIG brazing for automotive application[J].Materials Characterization,2016,112(4):229-237.
[3]EZAZI M A,YUSOF F,SARHAN A A D.Employment of fiber laser technology to weld austenitic stainless steel 304lwith aluminum alloy 5083using pre-placed activating flux[J].Materials&Design,2015,87(3):105-120.
[4]BORISOVA A L,TIMOFEEVA I I,VASIL M A.Structural and phase transformations in Fe-Al intermetallic powders during mechanochemical sintering[J].Powder Metallurgy and Metal Ceramics,2015,54(7/8):490-496.
[5]LIU W,MA J,ATABAKI M M,et al.Joining of advanced highstrength steel to AA 6061alloy by using Fe/Al structural transition joint[J].Materials&Design,2015,68(5):146-157.
[6]张秉刚,何景山,曾如川.LF2铝合金与Q235钢加入中间Cu层电子束焊接接头组织及形成机理[J].焊接学报,2007,28(6):37-42.ZHANG B G,HE J S,ZENG R C,et al.Microstructures and formation of EBW joint of aluminum alloy LF2to steel Q235 with transition metal Cu[J].Transactions of the China Welding Institution,2007,28(6):37-42.
[7]MATHIEU A,PONTEVICCI S,WIALA J C,et al.Laser brazing of a steel/aluminium assembly with hot filler wire(88%Al,12%Si)[J].Materials Science and Engineering:A,2006,19(28):435-436.
[8]周惦武,田伟,彭利,等.镀锌钢/铝添加中间夹层Cu、Pb的激光搭接焊研究[J].稀有金属材料与工程,2014,43(5):1181-1186.ZHOU D W,TIAN W,PENG L,et al.Laser lap welding of steel and aluminum alloy with Cu,Pb metal sandwich addition[J].Rare Metal Materials and Engineering,2014,43(5):1181-1186.
[9]张丽娟,周惦武,刘金水,等.钢/铝异种金属添加粉末的激光焊接[J].中国有色金属学报,2013,23(12):3401-3409.ZHANG L J,ZHOU D W,LIU J S,et al.Laser welding of steel/aluminum dissimilar metal with power addition[J].The Chinese Journal of Nonferrous Metals,2013,23(12):3401-3409.
[10]周惦武,李宁宁,刘元利,等.胶层辅助激光焊双相钢/铝合金接头显微组织与力学性能[J].中国有色金属学报,2015,25(9):2381-2388.ZHOU D W,LI N N,LIU Y L,et al.Microstructure and mechanical properties of dual phase steel/aluminum alloy laser welding with adhesive layer addition[J].The Chinese Journal of Nonferrous Metals,2015,25(9):2381-2388.
[11]蒋淑英,李世春.Al/Fe液-固界面扩散反应层生长动力学分析[J].材料工程,2015,43(5):62-66.JIANG S Y,LI S C.Growth kinetics analysis on diffusion reaction layer in Al/Fe liquid-solid interface[J].Journal of Materials Engineering,2015,43(5):62-66.
[12]彭艳,周惦武,徐少华,等.钢/铝异种金属激光焊接Fe/Al界面微合金化的第一性原理研究[J].稀有金属材料与工程,2012(增刊2):302-306.PENG Y,ZHOU D W,XU S H,et al.First-principles studies of the effects of microalloy elements on Fe/Al interface for laser lap welding of steel and aluminum[J].Rare Metal Materials and Engineering,2012(Suppl 2):302-306.
[13]QI Y,HECTOR L G,OOI N,et al.A first principles study of adhesion and adhensive transfer at Al(111)/graphite(001)[J].Surface Science,2005,581(3):155-168.
[14]KWAK B W,KIM D K,KIM B S.Effect of FeAl on mechanical properties and consolidation of nanostructured(W,Ti)C by the high frequency induction heating[J].Materials Transactions,2015,56(11):1915-1918.
[15]MECO S,PARDAL G,GANGULY S,et al.Application of laser in seam welding of dissimilar steel to aluminium joints for thick structural components[J].Optics and Lasers in Engineering,2015,67(4):22-30.
[16]KANT R,PRAKASH U,AGARWALA V.Wear behaviour of an FeAl intermetallic alloy containing carbon and titanium[J].Intermetallics,2015,61(5):21-26.
[17]FORNALCZYK A,CEBULSHI J,DOROTA P.The morphology of corrosion products in FeAl alloys after heat-resistance tests at different temperatures[J].Solid State Phenomena,2015,227(7):409-412.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |