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

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

• Modeling and Simulations • Previous Articles Next Articles

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

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)

Abstract

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

Zhimin Liu Shuming Xing Peiwei Bao Nan Li Shuqing Yao Milan Zhang. A New Analytical Model for the Flow Stress of Twin-roll Casting Magnesium Sheet at Elevated Temperatures[J]. J Mater Sci Technol, 2010, 26(5): 461-466.

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

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