焊接电流对ZM6镁合金薄壁件焊接接头组织和性能的影响
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摘要
以ZM6镁合金薄壁铸件为研究对象,通过OM、SEM观察和显微硬度以及拉伸性能测试等分析测试手段,研究焊接电流对焊接接头质量的影响规律。研究发现:随着焊接电流的增大,焊缝区的晶粒尺寸减小,显微硬度增大;而焊接接头的抗拉强度随电流的增加呈先缓慢增加后减小的变化趋势;随焊接电流的增大,焊接裂纹的敏感性也随之增加。
The welded joint of the thin-walled castings with ZM6 magnesium alloys was prepared by TIG method. The microstructure and mechanical properties of welded joint were characterized by optical microscope(OM),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),micro-hardness test and tensile testing method. The experimental results show that grain size of weld zone decreases with increasing welding current,but the micro-hardness increases,and the tensile strength of welded joints increases slowly and then decreases. And with the increase of welding current,welding crack sensitivity also increases.
The welded joint of the thin-walled castings with ZM6 magnesium alloys was prepared by TIG method. The microstructure and mechanical properties of welded joint were characterized by optical microscope(OM),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),micro-hardness test and tensile testing method. The experimental results show that grain size of weld zone decreases with increasing welding current,but the micro-hardness increases,and the tensile strength of welded joints increases slowly and then decreases. And with the increase of welding current,welding crack sensitivity also increases.
引文
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[2]章晓波,殷俏,马青龙,等.时效处理对挤压态Mg-Gd-NdSr-Zn-Zr合金力学与腐蚀性能的影响[J].中国有色金属学报,2016,16(3):526-534.
[3]刘筱,朱必武,李落星,等.挤压态AZ31镁合金热变形过程中的孪生和织构演变[J].中国有色金属学报,2016,26(2):288-296.
[4]邓海鹏,何柏林.镁合金焊接接头疲劳性能研究进展[J].兵器材料科学与工程,2016,39(4):125-129.
[5]王欣,杨闯,冯吉才.ZM6镁合金铸件TIG焊补焊工艺[J].焊接学报,2010,31(9):33-36.
[6]张铁磊,吉泽升,赵振华.热处理对ZM6镁合金TIG焊后组织性能的影响[J].中国有色金属学报,2013,23(3):593-598.
[7]KASPRZAK W,CZERWINSKI F,NIEWCZAR M,et al.Correlating hardness retention and phase transformation of Al and Mg cast alloys for aerospace applications[J].Journal of Materials Engineering and Performance,2015,24(3):1365-1378.
[8]彭建,朱熹,童小山,等.复合助焊剂对AZ31镁合金TIG焊焊接接头组织与性能的影响[J].中国有色金属学报,2013,23(11):3141-3146.
[9]QUAN Y J,CHEN Z H,GONG X S,et al.Effects of heat input on microstructure and tensile properties of laser welded magnesium alloy AZ31[J].Materials Characterization,2008,59:1491-1497.
[10]KHAYYAMIN D,MOSTAFAPOUR A,KESHMIRI R.The effect of process parameters on microstructural characteristics of AZ91/Si O2composite fabricated by FSP[J].Materials Science&Engineering A,2013,559:217-221.
[11]夏罗生,朱树红.AZ31B镁合金FSW接头与MIG接头性能对比研究[J].兵器材料科学与工程,2014,37(1):43-46.
[12]DAI Jun,HUANG Jian,LI Zhuguo,et al.Effects of heat input on microstructure and mechanical properties of laser-welded Mg-rare earth alloy[J].JMEPEG,2013,22:64-70.
[13]CAO X,XIAO M,JAHAZI M,et al.Continuous wave nd:yag laser welding of sand-cast ze41a-t5 magnesium alloys[J].Materials and Manufacturing Processes,2005,20:987-1004.
[14]CHI Chaoting,CHAO Chuenguang,LIU Tzengfeng,et al.Aluminum element effect for electron beam welding of similar and dissimilar magnesium-aluminum-zinc alloys[J].Scripta Materialia,2007,56:733-736.
[15]冯吉才,王亚荣,张忠典.镁合金焊接技术的研究现状及应用[J].中国有色金属学报,2005,15(2):165-167.
[16]杨涛,张生虎,高洪明,等.TIG-MIG复合焊电弧特性机理分析[J].焊接学报,2012,33(7):25-28.
[17]张兆栋,刘黎明,王来.镁合金活性TIG焊焊接接头组织特征分析[J].焊接学报,2004,25(4):55-58.
[18]LIN Sanbao,YANG Chunli,HE Wanbin,et al.Effects of fluxes with single component on weld depth in A-TIG welding of magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2005,15(S2):56-59.
[19]LIU Xuehe,GU Shihai,WU Ruizhi,et al.Microstructure and mechanical properties of Mg-Li alloy after TIG welding[J].Transactions of Nonferrous Metals Society of China,2011,21(3):477-481.
[20]FARAJI A H,GOODARZI M,SEYEDEIN S H,et al.Numerical modeling of heat transfer and fluid flow in hybrid laserTIG welding of aluminum alloy AA6082[J].Int J Adv Manuf Technol,2015,77:2067-2082.
[21]YI Huijun,LEE Yongjun,LEE Kwango.Influences of the welding heat input and the repeated repair welding on Ti-3Al-2.5V titanium alloy[J].Acta Metall Sin(Engl Lett),2015,28(6):684-691.
[22]游国强,王向杰,齐冬亮,等.线能量对挤压AZ91D镁合金GTAW焊接接头组织与性能的影响[J].材料工程,2013(10):57-64.
[23]QIAN M,STJOHN D H,FORST M T.Characteristic zirconium-rich coring structures in Mg-Zr alloys[J].Scripta Materialia,2002,46(9):649-654.
[24]QIAN M A,STJOHN D H,FORST M T.Effect of soluble and Insoluble zirconium on the grain refinement of magnesium alloys[J].Materials Science Forum,2003,419/420/421/422(2):593-598.
[25]刘洪汇.Zr对Mg-2.8Nd-0.35Zn合金高温性能影响的研究[D].哈尔滨:哈尔滨理工大学,2005:33-34.
[26]崔忠圻,覃耀春.金属学与热处理[M].北京:机械工业出版社,2010:53-60.
[27]VEPREK S.The search for novel,superhard materials[J].Journal of Vacuum Science and Technology A,1999,17(5):2401-2420.