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An improved kinetics model to describe dynamic recrystallization behavior under inconstant deformation conditions

Published online by Cambridge University Press:  13 September 2016

Ming-Song Chen*
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China
Kuo-Kuo Li
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China
Yong-Cheng Lin*
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China; and Light Alloy Research Institute of Central South University, Changsha 410083, China
Wu-Quan Yuan
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China
*
a) Address all correspondence to these authors. e-mail: chenms18@csu.edu.cn
b) e-mail: yclin@csu.edu.cn
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Abstract

The classical dynamic recrystallization (DRX) kinetics models, such as Avrami equation, are often used to describe the DRX behaviors of alloys. However, it is found that the classical DRX kinetics models cannot be directly applied to evaluate DRX volume fractions under inconstant deformation conditions, such as at fluctuant deformation temperature and strain rate. It obviously limits their application in the practical industrial production. Therefore, an improved DRX kinetics model is proposed based on the hypothesis that the derivatives of DRX volume fraction with respect to strain only depends on the current deformation temperature, strain rate, and DRX volume fraction. To verify the improved DRX kinetics model, the hot compressive tests in which the strain rate is inconstant are carried out on a solution-treated Ni-based superalloy. Experimental results indicate that the improved DRX kinetics model can well predict the DRX behavior under inconstant deformation conditions.

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Articles
Copyright
Copyright © Materials Research Society 2016 

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References

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