锻压技术

镁合金汽车轮毂预制坯超塑成形研究

英文标题：Study on superplastic forming of preformed blank for magnesium alloy wheel

作者：李更新

单位：威海职业学院

关键词：镁合金轮毂超塑成形

分类号：TG376

出版年,卷(期):页码：2014,39(6):71-74

摘要：

研究了铸态AZ80A镁合金汽车轮毂预制坯的超塑成形，通过实验验证了该合金超塑性成形的最佳工艺参数为：成形温度410 ℃、应变速率0.01 s-1；在选定成形参数的基础上制订了超塑成形工艺，等温挤压成形出合格的汽车轮毂预制坯试样；通过对轮毂预制坯成形前后的微观组织的对比分析发现，在预制坯成形过程中AZ80A镁合金发生了动态再结晶，形状不规则的粗大铸态晶粒通过挤压成形变成了晶粒细小的等轴晶，枝晶状的β相被破碎，沿轴向等轴晶呈带状分布，形成了纤维织构。通过试样检测发现，等温成形轮毂预制坯的综合力学性能良好，特别是轴向力学性能更为突出，这是因为成形后的晶粒细化和纤维织构形成。

The superplastic forming of preformed blank for casting AZ80A magnesium alloy wheel was studied, and the optimal parameters of superplatic forming for this alloy were selected based on the tests. The forming temperature is 410 ℃, and the strain rate is 0.01 s-1. Superplastic forming process was decided based on these parameters. The preformed blank of magnesium alloy wheel was made through isothermal extrusion technology. The microstructures of preformed blank wheel before and after forming were compared. The results show that the dynamic recrystallization happens during the preformed blank forming，the tiny isometric grains are obtained from big irregular casting ones through extrusion, the dendritic β phase is crushed，and along the axial direction the grains are in zonal distribution and fiber structure is formed. The synthesized mechanical properties of preformed blank of isothermal extruded wheel are excellent, especially the axial one is outstanding, which dues to the occuring of grain refinement and fiber structure caused by superplastic forming.

基金项目：

河南省科技攻关项目（072102230007）；西北工业大学凝固技术国家重点实验室开放课题（SKLSP201008）

参考文献：

［1］李更新，文九巴，杨永顺，等.镁合金汽车轮毂精密成形缺陷分析[J].塑性工程学报，2012,19（6）：10-14.Li Gengxin, Wen Jiuba, Yang Yongshun, et al. Defects analysis in plastic forming of magnesium alloy wheel[J]. Journal of Plasticity Engineering, 2012, 19(6):10-14.
［2］李双寿, 金鑫焱, 唐靖林, 等. 铸造镁合金轮毂研究应用现状[J]. 特种铸造及有色合金, 2005, (Z1):60-63.Li Shuangshou, Jin Xinyan, Tang Jinglin, et al. Application and development of foundry magnesium wheel[J]. Special Casting & Nonferrous Alloys, 2005, (Z1):60-63.
［3］滕焕波, 冯再新, 张治民. 轻合金汽车轮毂的生产方法[J]. 轻合金加工技术, 2006, 34(10): 16-19, 55.Teng Huanbo, Feng Zaixin, Zhang Zhimin. Production methods of the automobile disc wheel of fight metal alloy[J]. Light Alloy Fabrication Technology, 2006, 34(10): 16-19, 55.
［4］贾俐俐.挤压工艺及模具[M].北京：机械工业出版社, 2006.Jia Lili. Extrusion Technology and Die[M]. Beijing: China Machine Press, 2006.
［5］陈振华.变形镁合金[M].北京: 化学工业出版社，2005.Chen Zhenhua. Wrought Magnesium Alloys[M]. Beijing: Chemical Industry Press, 2005.
［6］刘英. Mg2Al2X变形镁合金的制备及组织性能的研究[D].广州：华南理工大学, 2003.Liu Ying. Study on the Manufacture and Structure Property of Mg2Al2X Wrought Magnesium Alloy[D]. Guangzhou: South China University of Technology, 2003.
［7］宋佩维, 郭学锋, 张忠明. 镁合金材料超塑性的研究进展[J]. 铸造技术, 2005, 26(8): 664-667.Song Peiwei, Guo Xuefeng, Zhang Zhongming. Research on development of superplasticity for magnesium alloys[J]. Foundry Technology, 2005, 26(8): 664-667.
［8］赵辉，彭晓东，王艳光，等. 变形镁合金的塑性改善研究现状[J]. 稀有金属，2012，36(1): 161-166.Zhao Hui，Peng Xiaodong，Wang Yanguang, et al. Research status about plasticity improvement of wrought magnesium alloys [J].Chinese Journal of Rare Metals, 2012，36(1): 161-166.
［9］杨明.AZ80镁合金动态再结晶行为与超塑性行为研究[D].洛阳：河南科技大学,2011.Yang Ming. The Study on the Dynamic Recrystallization Behaviors and the Superplastic Behaviors for AZ80 Magnesium alloy[D]. Luoyang:Henan University of Science and Technology, 2011.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】