转速对6082-T6铝合金搅拌摩擦焊焊接接头织构的影响
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摘要
采用电子背散射衍射技术,借助取向成像分析软件,研究了搅拌头在不同转速下,6082-T6铝合金搅拌摩擦焊焊核区上表面晶粒形貌、晶界特征、织构组分的演化.结果表明,在搅拌针所引入的剪切应力作用下,焊核区形成(110)[001]高斯织构和(114)[22ˉ1]织构,轴肩的顶锻压力使其沿着TD方向旋转一定角度,形成(112)[11ˉ1]铜织构,随着搅拌头转速的提高,晶粒沿着TD方向旋转角度增加,进一步形成(100)[011]剪切织构和(11ˉ1)[112]织构;焊核区晶粒受到搅拌针的挤压而形成[110]丝织构,搅拌头转速从1 200 r/min提高到2 000 r/min时,挤压程度增加,导致[110]丝织构组分显著增多.
The evolutions of grain morphology, grain boundary features and texture components on the upper surface of friction stir welding nugget for 6082-T6 aluminum alloy at different rotation speeds of tool were studied by electron backscatter diffraction technology combined with orientation analysis software. The results indicated that the(110) [001]Goss texture and(114)[2 211] texture were formed in the nugget zone under the shear stress introduced by the pin, and the upsetting pressure of the shoulder made it rotate to certain angle along the transverse direction, leading to the formation of(112)[1111 ] copper texture. With elevating the rotation speed of tool, the rotation angle of grains along the transverse direction increased, resulting in the further formation of(100) [011]shear texture and(1111)[112] texture. [110] fiber texture was formed by extrusion of grain in nugget zone by pin. When the rotation speed of tool was elevated from 1 200 to 2 000 r/min,the extrusion degree was increased, which resulted in a significant increase in the components of [110] fiber texture.
The evolutions of grain morphology, grain boundary features and texture components on the upper surface of friction stir welding nugget for 6082-T6 aluminum alloy at different rotation speeds of tool were studied by electron backscatter diffraction technology combined with orientation analysis software. The results indicated that the(110) [001]Goss texture and(114)[2 211] texture were formed in the nugget zone under the shear stress introduced by the pin, and the upsetting pressure of the shoulder made it rotate to certain angle along the transverse direction, leading to the formation of(112)[1111 ] copper texture. With elevating the rotation speed of tool, the rotation angle of grains along the transverse direction increased, resulting in the further formation of(100) [011]shear texture and(1111)[112] texture. [110] fiber texture was formed by extrusion of grain in nugget zone by pin. When the rotation speed of tool was elevated from 1 200 to 2 000 r/min,the extrusion degree was increased, which resulted in a significant increase in the components of [110] fiber texture.
引文
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[2]Su J Q,Nelson T W,Mishra R,et al.Microstructural investigation of friction stir welded 7050-T651 aluminium[J].Acta Materialia,2003,51(3):713-729.
[3]Topic I,H?ppel H W,G?ken M.Friction stir welding of accumulative roll-bonded commercial-purity aluminium AA1050 and aluminium alloy AA6016[J].Materials Science&Engineering A,2009,503(1):163-166.
[4]董学伟,黎向锋,左敦稳,等.7022铝合金搅拌摩擦焊接全过程温度场的数值模拟[J].机械工程材料,2012,36(10):92-96.Dong Xuewei,Li Xiangfeng,Zou Dunwen,et al.Numerical simulation welding of temperature field in the process for 7022 aluminum full friction stir alloy[J].Materials for Mechanical Engineering,2012,36(10):92-96.
[5]王希靖,韩晓辉,李常锋,等.厚铝合金板搅拌摩擦焊塑性金属不同深度的水平流动状况[J].中国有色金属学报,2005,15(2):198-204.Wang Xijing,Han Xiaohui,Li Changfeng,et al.Horizontal flow status ofplasticmetal in differentdepth during friction stir welding for thick alum inum alloy[J].Transactions of Nonferrous Metals Society of China,2005,15(2):198-204.
[6]Xu W F,Liu J H,Chen D L.Material flow and core/multi-shell structures in a friction stir welded aluminum alloy with embedded copper markers[J].Journal of Alloys&Compounds,2011,509(33):8449-8454.
[7]Suhuddin U F H R,Mironov S,Sato Y S,et al.Grain structure and texture evolution during friction stir welding of thin 6016 aluminum alloy sheets[J].Materials Science&Engineering A,2010,527(7-8):1962-1969.
[8]袁鸽成,梁春朗,刘洪,等.搅拌摩擦焊焊接5083铝合金板材焊核区的晶体取向[J].焊接学报,2014,35(8):79-82.Yuan Gecheng,Liang Chunlang,Liu Hong,et al.Crystal orientation in nugget zone of friction stir welded 5083 aluminum alloy plates[J].Tansactions of the China Welding Instiution,2014,35(8):79-82.
[9]张洪武,张昭,陈金涛.搅拌摩擦焊接过程中搅拌头转速对材料流动的影响[J].金属学报,2005,41(8):853-859.Zhang Hongwu,Zhang Zhao,Chen Jintao.Effect of angular velocity of the pin on materal folw during friction stir welding[J].Acta Metallurgica Sinica,2005,41(8):853-859.
[10]王希靖,韩晓辉,郭瑞杰,等.搅拌摩擦焊接过程温度场数值模拟[J].焊接学报,2005,26(12):17-20.Wang Xijing,Han Xiaohui,Guo Ruijie,et al.Numberical simulation of temperature field in friction stir welding[J].Tansactions of the China Welding Instiution,2005,26(12):17-20.
[11]张成聪,常保华,陶军,等.2024铝合金搅拌摩擦焊过程组织演化分析[J].焊接学报,2013,34(3):57-60.Zhang Chengcong,Chang Baohua,Tao Jun,et al.Microstructure evolution during friction stir welding of 2024 aluminum alloy[J].Tansactions of the China Welding Instiution,2013,34(3):57-60.
[12]Sato Y S,Kokawa H,Ikeda K,et al.Microtexture in the frictionstir weld of an aluminum alloy[J].Metallurgical and Materials Transactions A,2001,32(4):941-948.
[13]胡庚祥,蔡珣,戎咏华.材料科学基础[M],上海:上海交通大学出版社,2000.
[14]Jeon J,Mironov S,Sato Y S,et al.Anisotropy of structural response of single crystal austenitic stainless steel to friction stir welding[J].Acta Materialia,2013,61(9):3465-3472.
[15]张信钰.金属和合金的织构[M],北京:科学出版社,1976.