锻压技术

AZ80镁合金深孔筒形件数值模拟及试验研究

英文标题：Numerical and experimental investigation of deep hole cylindrical component of AZ80 magnesium alloy

作者：李建平车路长

分类号：TG376.3

出版年,卷(期):页码：2014,39(5):66-72

摘要：

采用Gleeble-1500热模拟试验机得到AZ80镁合金的流动应力-应变曲线，根据应力-应变曲线求得材料热变形的材料常数，基于刚塑性有限元法，对AZ80镁合金的反挤压过程进行数值模拟。分析挤压过程中的载荷-行程曲线以及坯料内部的等效应力、等效应变分布，并就挤压温度和挤压速度对反挤压过程的影响进行分析。根据模拟结果对筒形件进行反挤压试验，分析成形件的显微组织及力学性能。模拟结果表明，镁合金深孔筒形件的最佳反挤压温度为360 ℃，反挤压速度为5 mm·s-1。采用此工艺制备的筒形件表面质量良好，组织得到明显细化，且其抗拉强度、屈服强度与伸长率分别为324 MPa，216 MPa和11%。

The flow stress-strain curves of AZ80 magnesium alloy were obtained on the Gleeble-1500 thermo-mechanical simulator, and the backward extrusion of AZ80 magnesium alloy was simulated numerically based on material constants obtained from flow stress-strain curves and rigid-plastic finite element method. The load-stroke curves during backward extrusion and distribution of effective stress and effective strain of billet interior were analyzed, and the effects of extrusion temperature and velocity on backward extrusion process were also discussed. The backward extrusion tests were carried out based on the simulation results, and the microstructure and mechanical property of formed parts were also discussed. The results show that the optimum backward extrusion temperature and velocity for deep hole cylindrical component of magnesium alloy is 360 ℃ and 5 mm·s-1, respectively. The components prepared by the above process are of very good surface finish and obviously refining microstructure, and the tensile strength, yield strength and elongation of components are 324 MPa, 216 MPa and 11%, respectively.

基金项目：

国防基础科研项目（A1020110013）

李建平（1964-），男，硕士，副教授

参考文献：

［1］Zhang Kui, Li Xinggang, Li Yongjun, et al. Effect of Gd content on microstructure and mechanical properties of Mg-Y-RE-Zr alloys[J]. Trans. Nonferrous Met. Soc. China, 2008, 18(s1): 12-16.
［2］马鸣龙, 张奎, 李兴刚, 等. GWN751K 镁合金组织和性能研究[J]. 稀有金属材料与工程,2011, 40(4): 635-639.Ma Minglong, Zhang Kui, Li Xinggang, et al. Study on the microstructures and properties of GWN751K magnesium alloy [J]. Rare Metal Materials and Engineering, 2011, 40(4): 635-639.
［3］陈强. 合金加工流变学及其应用[M]. 北京：冶金工业出版社, 2012.Chen Qiang. Rheology of Alloys Processing and Its Application [M]. Beijing: Metallurgical Industry Press, 2012.
［4］袁家伟, 李婷, 李兴刚, 等. Mg-xZn-1Mn镁合金均匀化热处理及扩散动力学研究[J]. 稀有金属, 2012, 36(3): 373-379. Yuan Jiawei, Li Ting, Li Xinggang, et al. Homogenizing heat treatment and diffusion kinetics of Mg-xZn-1Mn magnesium alloy[J]. Chinese Journal of Rare Metals, 2012, 36(3): 373-379.
［5］石磊, 李继文, 李永兵, 等. AZ31镁合金的热挤压变形和力学性能分析[J]. 锻压技术, 2009, 34 (6): 35-38. Shi Lei, Li Jiwen, Li Yongbing, et al. Hot extrusion deformation of AZ31 magnesium alloy and mechanics performance analysis [J]. Forging & Stamping Technology, 2009, 34 (6): 35-38.
［6］陈彬, 林栋棵, 曾小勤, 等. AZ31镁合金大压下率轧制的研究[J]. 锻压技术, 2006, 31(3): 1-3.Chen Bin, Lin Dondke，Zeng Xiaoqin, et al. Research on heavy reduction rate rolling of AZ31 magnesium alloy [J]. Forging & Stamping Technology, 2006, 31(3): 1-3.
［7］夏祥生, 朱鸣峰, 张跃, 等. 粗晶EW75镁合金变形孔洞的产生及愈合研究[J]. 稀有金属, 2012, 36(2): 207-212. Xia Xiangsheng, Zhu Mingfeng, Zhang Yue, et al. Generation and healing of cavities in coarse grain EW75 magnesium alloy[J]. Chinese Journal of Rare Metals, 2012, 36(2): 207-212.
［8］梁海成, 崔建忠. AZ80镁合金高温热变形流变应力研究[J]. 锻压技术, 2009, 34(2): 113-116.Liang Haicheng, Cui Jianzhong. Study on flow stress of AZ80 magnesium alloy during hot compression deformation at elevated temperatures [J]. Forging & Stamping Technology, 2009, 34(2): 113-116.
［9］邓子玉, 陈献刚, 王华文, 等. AZ80镁合金拔长工艺及锻后力学性能研究[J]. 锻压技术, 2011, 36(1): 17-20.Deng Ziyu，Chen Xiangang，Wang Huawen, et al. Research on forging-out and mechanical properties after forging of AZ80 magnesium alloy [J]. Forging & Stamping Technology, 2011, 36(1): 17-20.
［10］夏祥生, 李兴刚, 马鸣龙, 等. 粗晶Mg-6.8Gd-4.5Y-1.1Nd-0.5Zr合金高温变形行为研究[J]. 材料热处理学报, 2012, 33(9): 30-35.Xia Xiangsheng, Li Xinggang, Ma Minglong, et al. Hot compression deformation behavior of Mg-6.8Gd-4.5Y-1.1Nd-0.5Zr alloy [J]. Transactions of Materials and Heat Treatment, 2012, 33(9): 30-35.
［11］Yoo M H. Slip, twinning and fracture in hexagonal close-packed metals [J]. Metallurgical and Materials Transactions A, 1981, 12(3): 409-418.
［12］Barnett M R. A Taylor model based description of the proof stress of magnesium AZ31during hot working [J]. Metallurgical and Materials Transactions A, 2003, 34(9): 1799-1806.
［13］夏祥生. 多向锻造EW75合金组织及力学性能研究[D]. 北京: 北京有色金属研究总院, 2012.Xia Xiangsheng. Microstructure and Mechanical Property of EW75 Alloy Prepared by Multidirectional Forging [D]. Beijing: General Research Institute for Nonferrous Metals, 2012.

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