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Improved dislocation density-based models for describing hot deformation behaviors of a Ni-based superalloy

Published online by Cambridge University Press:  14 June 2016

Y.C. Lin ,
Dong-Xu Wen ,
Ming-Song Chen ,
Yan-Xing Liu ,
Xiao-Min Chen  and
Xiang Ma
Y.C. Lin*
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China; Light Alloy Research Institute of Central South University, Changsha 410083, Hunan Province, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China
Dong-Xu Wen
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China
Ming-Song Chen
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China
Yan-Xing Liu
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China
Xiao-Min Chen
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China
Xiang Ma
Affiliation:
SINTEF Materials and Chemistry, Blindern, 0314 Oslo, Norway
*
a) Address all correspondence to this author. e-mail: yclin@csu.edu.cn, linyongcheng@163.com
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Abstract

Generally, the obvious work hardening, dynamic recrystallization (DRX), and dynamic recovery behaviors can be found during hot deformation of Ni-based superalloys. In the present study, the classical dislocation density theory is improved by introducing a new dislocation annihilation item to represent the influences of DRX on dislocation density evolution for a Ni-based superalloy. Based on the improved dislocation density theory, the peak strain corresponding to peak stress and the critical strain for initiating DRX can be determined, and the improved DRX kinetics equations and grain size evolution models are developed. The physical framework and algorithmic idea of the improved dislocation density theory are clarified. Moreover, the deformed microstructures are characterized and quantitatively correlated to validate the improved dislocation density theory. It is found that the improved dislocation density-based models can precisely characterize hot deformation and DRX behaviors for the studied superalloy under the tested conditions.

Keywords

alloystress/strain relationshipdislocation

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Type
Articles
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Journal of Materials Research , Volume 31 , Issue 16 , 29 August 2016 , pp. 2415 - 2429
Copyright
Copyright © Materials Research Society 2016 

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References

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