搅拌摩擦焊接2195-T8铝锂合金接头的室温和低温拉伸性能
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摘要
在不同焊接速度(100～300mm·min-1)下对2mm厚2195铝锂合金板进行搅拌摩擦焊接,研究了焊接速度对接头室温和低温(-183℃)拉伸性能的影响,以及从室温到低温接头与母材拉伸性能变化的差异。结果表明:不同焊接速度下接头的低温屈服强度和抗拉强度均高于室温的,当焊接速度为200mm·min-1时接头的室温和低温拉伸性能最好;从室温到低温,接头的抗拉强度和塑性增幅高于母材的,低温下接头拉伸性能的提高程度高于母材的;随着焊接速度的增大,拉伸断裂位置由焊核区近后退侧处转移到之字线处。
Two-millimeter thick 2195 Al-Li alloy plates were welded by friction stir welding at different welding speeds(100-300 mm·min-1).The effects of welding speed on tensile properties of the joint at room and cryogenic(-183℃)temperatures were studied.The difference in the change of tensile properties between the joint and base metal from room temperature to cryogenic temperature was also investigated.The results show that the yield strength and tensile strength of the joint at cryogenic temperature and different welding speeds were higher than those at room temperature.When the welding speed was 200 mm·min-1,the tensile properties of the joint at room and cryogenic temperatures were the best.From room temperature to cryogenic temperature,the increase ranges of the tensile strength and ductility of the joint were higher than those of the base metal,indicating that the increase degree in tensile properties of the joint at cryogenic temperature was larger than that of the base metal.With increasing welding speed,the tesile fracture positions shifted from the near retreating side spot in the weld nugget zone to the zigzag line.
Two-millimeter thick 2195 Al-Li alloy plates were welded by friction stir welding at different welding speeds(100-300 mm·min-1).The effects of welding speed on tensile properties of the joint at room and cryogenic(-183℃)temperatures were studied.The difference in the change of tensile properties between the joint and base metal from room temperature to cryogenic temperature was also investigated.The results show that the yield strength and tensile strength of the joint at cryogenic temperature and different welding speeds were higher than those at room temperature.When the welding speed was 200 mm·min-1,the tensile properties of the joint at room and cryogenic temperatures were the best.From room temperature to cryogenic temperature,the increase ranges of the tensile strength and ductility of the joint were higher than those of the base metal,indicating that the increase degree in tensile properties of the joint at cryogenic temperature was larger than that of the base metal.With increasing welding speed,the tesile fracture positions shifted from the near retreating side spot in the weld nugget zone to the zigzag line.
引文
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[19]束彪,国旭明,张春旭.2195铝锂合金搅拌摩擦焊接头组织及性能[J].航空材料学报,2010,30(4):12-15.
[2] THOMAS W M,DAWES C J.Friction stir process welds aluminum alloys:The process produces low-distortion,highquality,low-cost welds on aluminum[J].Welding Journal,1996,75:41-45.
[3] THOMAS W M.Friction stir butt welding:PCT/GB92/02203[P].1991-12-01.
[4] GLAZER J,VERZASCONI S L,DALDER E N C,et al.Cryogenic mechanical properties of Al-Cu-Li-Zr alloy 2090[M]//Advances in Cryogenic Engineering Materials.Boston,MA:Springer US,1986:397-404.
[5] VENKATESWARA RAO K T,YU W K,RITCHIE R O.Cryogenic toughness of commercial aluminum-lithium alloys:Roleofdelaminationtoughening[J]. Metallurgical Transactions A,1989,20(3):485-497.
[6] VANDER KOOI D C, PARK W, HILTON M R.Characterization of cryogenic mechanicalproperties of aluminum-lithium alloy C-458[J].Scripta Materialia,1999,41(11):1185-1190.
[7] NAYANN, NARAYANAMURTYSVS,MUKHOPADHYAY A K,et al.Ambient and cryogenic tensile properties of AA2195T87sheets with pre-aging cold work by a combination of cold rolling and stretching[J].Materials Science and Engineering:A,2013,585:475-479.
[8] LEI X F,DENG Y,YIN Z M,et al.Tungsten inert gas and friction stir welding characteristics of 4-mm-thick 2219-T87plates at room temperature and-196℃[J].Journal of Materials Engineering and Performance,2014,23(6):2149-2158.
[9]董丰波,房湛,王凡,等.2195/2219异种FSW接头的低温力学性能[C]//第二十次全国焊接学术会议论文集.兰州:中国机械工程学会,2015:964-968.
[10] SATO Y S,YAMASHITA F,SUGIURA Y,et al.FIBassisted TEM study of an oxide array in the root of a friction stir welded aluminium alloy[J].Scripta Materialia,2004,50(3):365-369.
[11] SATO Y S, TAKAUCHI H,PARK S H C,et al.Characteristics of the kissing-bond in friction stir welded Al alloy 1050[J].Materials Science and Engineering:A,2005,405(1/2):333-338.
[12] CHEN Z W,CUI S.On the forming mechanism of banded structures in aluminium alloy friction stir welds[J].Scripta Materialia,2008,58(5):417-420.
[13] REN S R,MA Z Y,CHEN L Q.Effect of initial butt surface on tensile properties and fracture behavior of friction stir welded Al-Zn-Mg-Cu alloy[J]. Materials Science and Engineering:A,2008,479(1/2):293-299.
[14]陈鼎,陈振华.铝合金在低温下的力学性能[J].宇航材料工艺,2000,30(4):1-7.
[15] KRISHNAN K N.On the formation of onion rings in friction stir welds[J].Materials Science and Engineering:A,2002,327(2):246-251.
[16] LARSSON H,KARLSSON L,STOLTZ S,et al.Joining of dissimilar Al-alloys by friction stir welding[C]//2nd InternationalSymposiumonFrictionStirWelding.Gothenburg,Sweden:Emerald Group Publishing Limited,2000.
[17] YAN J H,SUTTON M A,REYNOLDS A P.Notch tensile response of mini-regions in AA2024and AA2524friction stir welds[J].Materials Science and Engineering:A,2006,427(1/2):289-300.
[18]金玉花,邵庆丰,甘瑞根,等.7050铝合金FSW焊核区的微观组织和断裂机理[J].兰州理工大学学报,2016,42(6):26-30.
[19]束彪,国旭明,张春旭.2195铝锂合金搅拌摩擦焊接头组织及性能[J].航空材料学报,2010,30(4):12-15.