锻压技术

加热温度对AZ31镁合金连续挤压组织与性能的影响

英文标题：Effect of heating temperature on microstructure and properties of AZ31 magnesium alloy in CONFORM process

作者：杨俊英高飞宁海石宋宝韫

分类号：TG379

出版年,卷(期):页码：2014,39(5):106-110

摘要：

采用连续挤压方法，开展AZ31镁合金工艺试验，研究加热温度对挤出产品微观组织和力学性能的影响。结果表明，加热温度对AZ31镁合金组织影响明显，坯料室温挤压时，产品的芯部组织均匀细小，而表层的晶粒大小不均。随着加热温度的升高，微观组织的均匀程度提高。当坯料加热到450 ℃时，挤出产品芯部的晶粒有长大的趋势。连续挤压后的晶粒相比坯料显著细化，这是由于坯料在连续挤压过程中经历了多种变形，使晶粒得到细化。随着加热温度的升高，抗拉强度增加，伸长率变化不大，这是由于温度的适当提高，使再结晶充分，晶粒均匀程度提高。

The process experiment of AZ31 magnesium alloy was carried out using the continuous extrusion forming process (CONFORM). The effect of heating temperature on the microstructure and mechanical properties was investigated. The results show that the effect of heating temperature on the microstructure of AZ31 magnesium alloy is obvious. Grains are uniform and fine in the core region and grain size is inhomogeneous in the surface region when the extrusion of billet is done at room temperature. With the increase of heating temperature, the uniformity of microstructure increases. The grains in the core region have grown up when the billet heating temperature is 450 ℃. The grain refinement is obviously realized comparing to billet after CONFORM process. The reason is that the billet suffers multiple deformations during CONFORM process which leads to the grain refinement. The tensile strength increases and the elongation does not change significantly with heating temperature increasing. This is due to that the proper improvement of temperature induces sufficient recrystallization and improves the grain uniformity.

基金项目：

辽宁省自然科学基金资助项目（2013020135）；辽宁省教育厅项目（L2013186）

杨俊英（1981-），女，博士，副教授

参考文献：

［1］Doege E, Drder K. Sheet metal forming of magnesium wrought alloys-formability and process technology [J]. Journal of Materials Processing Technology, 2001, 115(1): 14-19.
［2］Mordike B L, Ebert T. Magnesium: properties-application-potential[J]. Materials Science Engineering: A, 2001, 302(1): 37-45.
［3］孟强, 蔡庆伍, 姜海涛, 等. AZ31镁合金单轴拉伸过程中的{0002}双峰织构观察[J]. 稀有金属, 2011, 35(2): 159-163.Meng Qiang, Cai Qingwu, Jiang Haitao, et al. {0002} double peak texture of AZ31 magnesium alloy during uniaxial tension[J]. Chinese Journal of Rare Metals, 2011, 35(2): 159-163.
［4］Chang T C, Wang J Y, O C M, et al. Grain refining of magnesium alloy AZ31 by rolling[J]. Journal of Materials Processing Technology, 2003, 140(1-3): 588-591.
［5］Styczynski A, Hartig C H, Bohlen J, et al. Cold rolling textures in AZ31 wrought magnesium alloy[J]. Scripta Materialia, 2004, 50(7): 943-947.
［6］Chang L L, Shang E F, Wang Y N, et al. Texture and microstructure evolution in cold rolled AZ31 magnesium alloy[J]. Materials Characterization, 2009, 60(6): 487-491.
［7］Tang N, Wang M P, Lou H F, et al. Microstructure and texture of twin-roll cast Mg-3Al-1Zn-0.2 Mn magnesium alloy[J]. Materials Chemistry and Physics, 2009, 116(1): 11-15.
［8］Chen H M, Yu H S, Kang S B, et al. Effect of rolling temperature on microstructure and texture of twin roll cast ZK60 magnesium alloy[J]. Transactions of Nonferrous Metals Society of China, 2010, 20(11): 2086-2091.
［9］Green D. Continuous extrusion forming of wire sections[J]. Journal of the Institute of Metals, 1972, 100: 295-300.
［10］Zhang H, Yan Q Q, Li L X. Microstructures and tensile properties of AZ31 magnesium alloy by continuous extrusion forming process[J]. Materials Science and Engineering: A, 2008, 486(1-2): 295-299.
［11］陈水先, 张辉, 严琦琦. CONFORM连续挤压AZ31镁合金拉伸变形和断裂行为的研究[J]. 矿冶工程, 2008, 28(1): 88-90.Chen Shuixian, Zhang Hui, Yan Qiqi. Research of tensile deformation and fracture of CONFORM continuously extruded AZ31 magnesium alloy[J]. Mining and Metallurgical Engineering, 2008, 28(1): 88-90.
［12］吴桂敏, 高飞, 符蓉. AZ31镁合金连续挤压过程数值模拟[J]. 热加工工艺, 2009, 38(17): 39-41.Wu Guimin, Gao Fei, Fu Rong. Simulation on continuous extrusion forming process of AZ31 magnesium alloy[J]. Hot Working Technology, 2009, 38(17): 39-41.
［13］Yang J Y, Song B Y, Ning H S, et al. Microstructure of AZ31 magnesium alloy produced by the CONFORM process under different extrusion wheel velocities[J]. Advanced Materials Research, 2011, 189-193: 2609-2612.

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