J. Mater. Sci. Technol. ›› 2010, Vol. 26 ›› Issue (5): 461-466.

• Research Articles • 上一篇    下一篇

铸轧镁合金板新型高温流变的力学模型研究

刘志民1,张密兰2,邢书明1,鲍培玮1,李楠1,姚淑卿1   

  1. 1. 北京交通大学
    2. 北京交通大学，机械与电子控制工程学院，05级博士班，（半固态成形中心）
  • 收稿日期:2009-04-21 修回日期:2009-10-19 出版日期:2010-05-31 发布日期:2010-06-01
  • 通讯作者: 邢书明
  • 基金资助:

    北京自然科学基金

A New Analytical Model for the Flow Stress of Twin-roll Casting Magnesium Sheet at Elevated Temperatures

Zhimin Liu, Shuming Xing, Peiwei Bao, Nan Li, Shuqing Yao, Milan Zhang   

  1. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
  • Received:2009-04-21 Revised:2009-10-19 Online:2010-05-31 Published:2010-06-01
  • Contact: shuming xing
  • Supported by:

    the Beijing Natural Science Foundation, China (No. 3093024) 
    the Beijing Jiaotong University Science Foundation, China (No. 2007XM035)

RichHTML

1

PDF (PC)

1031

关键词: practical copper-containing steels , HREM image

Abstract:

To evaluate the flow stress of the twin-roll casting magnesium sheet in high temperature forming processes, a new analytical model was proposed by analyzing stress-strain curves measured under various temperatures and strain rates. The model can be parameterized to reflect the volume fraction of semi-sold grain and sold grains undergoing twinning. By applying the new model, the result showed that the simulated stress-strain curves fit the experiment data very well. Such curve fitting can be employed for any magnesium sheet when the deformation conditions are known. Microstructure evolution indicated that it affected the stress-strain curves directly. The mechanisms of dynamic recrystallization (DRX) depended on the operating deformation mechanisms, which changed with temperatures. And the volume fraction and grain size of DRX changed with
the Zener-Hollomon parameter and temperatures.

Key words: practical copper-containing steels, HREM image