采用水下搅拌摩擦焊接技术(Submerged friction stir welding, SFSW)对2024-T4铝合金板材进行连接,研究搅拌头转速对SFSW接头焊接温度场、焊核区析出相形貌以及接头力学性能的影响.结果表明:循环水冷介质具有明显的瞬时快冷作用;随着搅拌头转速从600 r/min增大到1180 r/min,SFSW接头焊接温度场峰值由271.0℃增大到310.8℃;焊核区析出相在热循环作用下析出并长大.析出相的数量逐渐增多,尺寸增大;SFSW接头焊核区显微硬度平均值由117.5HV降低至99.2HV、抗拉强度和伸长率分别由403.3 MPa和3.24%降低至334.5 MPa和1.44%.
@@@@2024-T4 aluminum alloy plate was jointed by submerged friction stir welding (SFSW). The effects of rotation speed on the welding temperature fields of SFS weld, precipitate morphology of the nugget zone and mechanical properties of SFS weld were investigated. The results show that the cooling water circulation medium has significant instantaneous cooling effect;the peak value of welding temperature fields increases from 271.0℃to 310.8℃with the rotation speed increases from 600 r/min to 1180 r/min. The precipitate phases of the nugget zone precipitate and grow under welding thermal cycle. The quantity and size of the precipitates gradually increase with the increase of the rotation speed. The average value of microhardness in the nugget zone of SFS weld decreases from 117.5HV to 99.2HV with the increase of the rotation speed, meanwhile, tensile strength and elongation of SFS weld decrease from 403.3 MPa and 3.24%to 334.5 MPa and 1.44%, respectively.
参考文献
| [1] | 刘会杰,张会杰,于雷.强冷介质作用下的铝合金搅拌摩擦焊焊接特征[J].焊接,2010(07):8-11. |
| [2] | THOMAS W M;NEEDLHAM J C;DAWES C J .Friction stir butt welding[P].Great Briton,9125978.8,1991-12-06. |
| [3] | Mishra RS;Ma ZY .Friction stir welding and processing[J].Materials Science & Engineering, R. Reports: A Review Journal,2005(1/2):III-0. |
| [4] | LEE W B;YEON Y M;JUNG S B .The improvement of mechanical properties of friction-stir-welded A365 Al alloy[J].Materials Science and Engineering A,2003,355:154-159. |
| [5] | GENEVOIS G;DESCHAMPS A;DENQUIN A;DOISNEAU-COTTIGNIES B .Quantitative investigation of precipitation and mechanical behavior for AA2024 friction stir welds[J].Acta Materialia,2005,53:2447-2458. |
| [6] | Srivatsan TS;Vasudevan S;Park L .The tensile deformation and fracture behavior of friction stir welded aluminum alloy 2024[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1-2):235-245. |
| [7] | LIU H J;ZHANG H J;HUANG Y X;YU L .Mechanical properties of underwater friction stir welded 2219 aluminum alloy[J].Transactions of Nonferrous Metals Society of China,2010,20:1387-1391. |
| [8] | H.J. Liu;H.J.Zhang;L.Yu .Effect of welding speed on microstructures and mechanical properties of underwater friction stir welded 2219 aluminum alloy[J].Materials & design,2011(3):1548-1553. |
| [9] | L. Fratini;G. Buffa;R. Shivpuri .In-process heat treatments to improve FS-welded butt joints[J].The International Journal of Advanced Manufacturing Technology,2009(7/8):664-670. |
| [10] | S.Benavides;Y.Li;L.E.Murr;D.Brown;J.C.McClure .Low-temperature friction-stir welding of 2024 aluminum[J].Scripta materialia,1999(8):809-815. |
| [11] | Rui-dong Fu;Zeng-qiang Sun;Rui-cheng Sun;Ying Li;Hui-jie Liu;Lei Liu .Improvement of weld temperature distribution and mechanical properties of 7050 aluminum alloy butt joints by submerged friction stir welding[J].Materials & design,2011(10):4825-4831. |
| [12] | L. Fratini;G. Buffa;R. Shivpuri .Mechanical and metallurgical effects of in process cooling during friction stir welding of AA7075-T6 butt joints[J].Acta materialia,2010(6):2056-2067. |
| [13] | P. Staron;M. Kocak;S. Williams .Residual stresses in friction stir welded al sheets[J].Applied physics, A. Materials science & processing,2002(Suppl.1):1161-1162. |
| [14] | 李光,李从卿,栾国红,董春林.阵列射流冲击热沉搅拌摩擦焊接新方法[J].稀有金属材料与工程,2009(z3):205-209. |
| [15] | CLARK T D .An analysis of microstructure and corrosion resistance in underwater friction stir welded 304L stainless steel[D].Provo,Utah,USA:Department of Mechanical Engineering,Brigham Young University,2005. |
| [16] | 简波,杜随更,傅莉.强制冷却搅拌摩擦焊接工艺[J].焊接学报,2006(06):21-24. |
| [17] | 孙鹏,杨延安,白文峰,王快社,李建平.镁合金强制冷却搅拌摩擦加工研究[J].热加工工艺,2011(01):135-137. |
| [18] | M.A. Mofid;A. Abdollah-zadeh;F. Malek Ghaini .The effect of water cooling during dissimilar friction stir welding of Al alloy to Mg alloy[J].Materials & design,2012(Apr.):161-167. |
| [19] | JARIYABOON M;DAVENPORT A J;AMBAT R;CONNOLLY B J WILLIAMS S W PRICE D A .The effect of welding parameters on the corrosion behaviour of friction stir welded AA2023-T351[J].Corrosion Science,2007,49:877-909. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%