焊接参数对Ti_2AlNb合金电子束焊接接头焊缝形状和残余应力的影响（英文）
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摘要
采用有限元数值模拟方法预测Ti_2AlNb合金电子束焊接接头的残余应力,并通过实验加以验证。对比模拟与实验结果,本文的数值计算方法具有良好的精度。结果表明,焊缝中心区域呈现三向拉应力状态;其他焊接参数相同条件下,聚焦电流对焊缝形状及尺寸具有显著影响,从而影响焊接残余应力水平;对于Ti_2AlNb合金厚板电子束熔透焊接头,焊缝中心具有1000MPa左右的厚度方向应力;增大熔宽可降低厚度方向应力,进而降低接头裂纹倾向。
In order to estimate the residual stresses in Ti_2AlNb alloy jointed by electron beam welding(EBW), a computational approach based on finite element method was developed. Meanwhile, experiments were carried out to verify the numerical results. The comparison between the simulation results and measurements suggests that the developed computational approach has sufficient accuracy to predict the welding residual stress distributions. The results show that the central area of the fusion zone suffers tensile stresses in three directions. When the other parameters remain unchanged, the focus current has great impact on the weld shape and size, and then affects the residual stress level significantly. Moreover, the thick plate full-penetrated EBW weld suffers near 1000 MPa tensile stress of Z-direction in the center of the fusion zone. The wider weld has lower tensile stress in Z-direction, resulting in lower risk for cracking.
In order to estimate the residual stresses in Ti_2AlNb alloy jointed by electron beam welding(EBW), a computational approach based on finite element method was developed. Meanwhile, experiments were carried out to verify the numerical results. The comparison between the simulation results and measurements suggests that the developed computational approach has sufficient accuracy to predict the welding residual stress distributions. The results show that the central area of the fusion zone suffers tensile stresses in three directions. When the other parameters remain unchanged, the focus current has great impact on the weld shape and size, and then affects the residual stress level significantly. Moreover, the thick plate full-penetrated EBW weld suffers near 1000 MPa tensile stress of Z-direction in the center of the fusion zone. The wider weld has lower tensile stress in Z-direction, resulting in lower risk for cracking.
引文
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[2]CHEN W,LI J W,XU L,LU B.Development of Ti2AINb alloys:Opportunities and challenges[J].Advanced Materials&Processes,2014,172(5):23-27.
[3]JIA J B,ZHANG K F,LIU L M,WU F Y.Hot deformation behavior and processing map of a powder metallurgy Ti-22Al-25Nb alloy[J].Journal of Alloys and Compounds,2014,600:215-221.
[4]KUMPFERT J,LEYENS C.Orthorhombic titanium aluminides:Intermetallics with improved damage tolerance[M].Titanium and Titanium Alloys:Fundamentals and Applications.Wiley-VCH Verlag GmbH&Co.KGaA,2003:59-88.
[5]ZOU G S,XIE E H,BAI H L,WU A P,WANG Q,REN J L.A study on transient liquid phase diffusion bonding of Ti-22Al-25Nb alloy[J].Materials Science and Engineering A,2009,499(1-2):101-105.
[6]LI Bei-bei,WANG Bin,LI Ping,LIU Yu-sheng,XUE Ke-min.Solid diffusion bonding of Ti2AlNb-based alloy[J].Transactions of Nonferrous Metals Society of China,2015,25(3):662-667.
[7]CHEN X,XIE F Q,MA T J,LI W Y,WU X Q.Effects of post-weld heat treatment on microstructure and mechanical properties of linear friction welded Ti2AlNb alloy[J].Materials&Design,2016,94:45-53.
[8]CHEN X,XIE F Q,MA T J,LI W Y,WU X Q.Microstructural evolution and mechanical properties of linear friction welded Ti2AlNb joint during solution and aging treatment[J].Materials Science and Engineering A,2016,668:125-136.
[9]CHEN Y B,ZHANG K Z,HU X,LEI Z L,NI L C.Study on laser welding of a Ti-22Al-25Nb alloy:Microstructural evolution and high temperature brittle behavior[J].Journal of Alloys and Compounds,2016,681:175-185.
[10]ZHANG K Z,NI L C,LEI Z L,CHEN Y B,HU X.Microstructure and tensile properties of laser welded dissimilar Ti-22Al-27Nb and TA15 joints[J].International Journal of Advanced Manufacturing Technology,2016,87(5-8):1685-1692.
[11]LEI Z L,DONG Z J,CHEN Y B,ZHANG J,ZHU R C.Microstructure and tensile properties of laser beam welded Ti-22Al-27Nb alloys[J].Materials&Design,2013,46:151-156.
[12]LEI Z L,DONG Z J,CHEN Y B,HUANG L,ZHU R C.Microstructure and mechanical properties of laser welded Ti-22Al-27Nb/TC4 dissimilar alloys[J].Materials Science and Engineering A,2013,559:909-916.
[13]TAN L J,YAO Z K,NING Y Q,GUO H Z.Effect of isothermal deformation on microstructure and properties of electron beam welded joint of Ti2AlNb/TC11[J].Materials Science and Technology,2011,27(9):1469-1474.
[14]TAN L J,YAO Z K,WANG T,GUO H Z.Effect of post-weld heat treatment on microstructure and properties of electron beam welded joint of Ti2AlNb/TC11[J].Materials Science and Technology,2011,27(8):1315-1320.
[15]TAN L J,YAO Z K,ZHOU W,GUO H Z,ZHAO Y.Microstructure and properties of electron beam welded joint of Ti-22Al-25Nb/TC11[J].Aerospace Science and Technology,2010,14(5):302-306.
[16]WANG S Q,LIU J H,CHEN D L.Tensile and fatigue properties of electron beam welded dissimilar joints between Ti-6Al-4V and BT9titanium alloys[J].Materials Science and Engineering A,2013,584:47-56.
[17]SABOL J C,PASANG T,MISIOLEK W Z,WILLIAMS J C.Localized tensile strain distribution and metallurgy of electron beam welded Ti-5Al-5V-5Mo-3Cr titanium alloys[J].Journal of Materials Processing Technology,2012,212(11):2380-2385.
[18]LI Y J,ZHAO Y,LI Q,WU A P,ZHU R C,WANG G Q.Effects of welding condition on weld shape and distortion in electron beam welded Ti2AlNb alloy joints[J].Materials&Design,2017,114:226-233.
[19]CHEN W,CHEN Z Y,WU C C,LI J W,TANG Z Y,WANG Q J.The effect of annealing on microstructure and tensile properties of Ti-22Al-25Nb electron beam weld joint[J].Intermetallics,2016,75:8-14.
[20]BHATTI A A,BARSOUM Z,MURAKAWA H,BARSOUM I.Influence of thermo-mechanical material properties of different steel grades on welding residual stresses and angular distortion[J].Materials&Design,2015,65(65):878-889.
[21]GONG Ping.Research on the factors influenced electron beam weld shape for TC4 titanium alloy[D].Dalian:Dalian Jiaotong University,2007.(in Chinese)
[22]LEI Zheng-long,DONG Zhi-jun,CHEN Yan-bin,ZHOU Kai,MARui.Effect of heat input on the microstructures and mechanical properties of laser welded Ti2AlNb alloys[J].Rare Metal Materials&Engineering,2014,43(3):579-584.