基于等温热压缩实验，分别获得了AA3003铝合金在变形温度为20～300℃，AA4343铝合金在变形温度为300～450℃，应变速率为0．01～1 s-1条件下的真实应力应变曲线，建立了AA4343铝合金的本构方程．采用DEFORM-2D软件，以AA3003为芯材，AA4343为包覆材料，分析了复合变形区长度、挤压速度和坯料温度对连续挤压包覆过程的影响．结果表明：随着复合变形区长度的减小，连续挤压包覆成形稳定时芯管的径向受力随之降低，合适的复合变形区长度为2．0 mm；随着挤压速度的增加，芯管出现了不同程度的变形，合适的挤压速度为0．1 mm/s；随着坯料温度的升高，芯管所受到的径向力随之减小，合适的温度范围为400～500℃．
The true stress-true strain curves of AA3003 and AA4343 aluminum alloy in the temperature range of 20~300 ℃ and 300~450℃, and in the strain rates range of 0.01~1 s-1 , were obtained by isothermal hot compression tests, and then the constitutive equation of AA4343 aluminum alloy was established. The influence of different processing parameters, such as length of clad forming zone, billet temperature and extrusion velocity, on the process of CONCLAD which select 3003 aluminum alloy as the core material and 4343 aluminum alloy as the cladding material was investigated with DEFORM-2D. The results show that the radial force of the core tube decreases as the length of clad forming zone increases during the steady state of CONCLAD process. With the increasing of extrusion velocity, the core tube exhibits deformation to different extent. With the increasing of billet temperature, the radial force of the core tube decreases. According to the analysis above, the optimal process parameters, such as length of clad forming zone 2. 0 mm, extrusion velocity 0.1 m/s and billet temperature 400~500 ℃, are obtained.
参考文献
| [1] | 钟毅.连续挤压技术及其应用[M].北京:冶金工业出版社,2004 |
| [2] | 李峰,林俊峰,张鑫龙,潘强荣.连续变截面直接挤压成形技术研究[J].材料科学与工艺,2012(05):55-59. |
| [3] | VASILE D C;NICOLAE S;DOINA R et al.Micro-structural observations of fracture surfaces for a 6063-T1 ECAP processed aluminum alloy[J].UPB Scien-tific Bulletin Series B:Chemistry and Materials Sci-ence,2010,72(04):163-172. |
| [4] | 张德海.板料成形过程回弹的三维检测与评价方法研究[J].材料科学与工艺,2012(04):128-133,139. |
| [5] | ETHERINGTON C.Conform-A New Concept for the Continuous Extrusion Forming of Metals[J].Journal of Engineering for Industry,1974(08):893-900. |
| [6] | MADDOCK B .[J].Aluminlum,1978,54(03):207-211. |
| [7] | TIROSH J.Theoretical and Experimental Study of the CONFORM Mertal Forming Proeess[J].Transactions of the ASME,1978 |
| [8] | 李明典;宋宝韫;杨鑫华 等.连续挤压轮槽塑性变形区应力分析及几何参数的确定[J].塑性工程学报,1999,6(03):25-30. |
| [9] | 储灿东 .连续挤压过程的3D计算机仿真和光塑性仿真[D].上海交通大学,2001. |
| [10] | 彭岳林;刘红卫 .连续挤压变形腔的改进及其上限分析[J].中南工业大学学报,1998,29(01):94-96. |
| [11] | 蔡一鸣,李慧中,梁霄鹏,汤国建.7039铝合金高温的热变形行为[J].中国有色金属学报,2008(10):1775-1780. |
| [12] | 李俊鹏,沈健,许小静,闫晓东,毛柏平.7050高强铝合金高温塑性变形的流变应力研究[J].稀有金属,2009(03):318-322. |
| [13] | T. S. Srivatsan;D. Kolar;P. Magnusen .Influence of temperature on cyclic stress response, strain resistance, and fracture behavior of aluminum alloy 2524[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(1/2):118-130. |
| [14] | S. Spigarelli;E. Evangelista;H.J. McQueen .Study of hot workability of a heat treated AA6082 aluminum alloy[J].Scripta materialia,2003(2):179-183. |
| [15] | RAMANATHAN S;KARTHIKEYAN R;DEEPAK K V et al.Hot deformation behavior of 2124 aluminum alloy[J].Materials Science and Technology,2006,22(05):611-615. |
| [16] | 吴文祥,孙德勤,曹春艳,王战锋,张辉.5083铝合金热压缩变流变应力行为[J].中国有色金属学报,2007(10):1667-1671. |
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