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A unified physically based constitutive model for describing strain hardening effect and dynamic recovery behavior of a Ni-based superalloy

Published online by Cambridge University Press:  21 December 2015

Y.C. Lin ,
Dong-Xu Wen ,
Yuan-Chun Huang ,
Xiao-Min Chen  and
Xue-Wen Chen
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
Yuan-Chun Huang
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
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
Xue-Wen Chen*
Affiliation:
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan Province, China
*
a) Address all correspondence to this author. e-mail: [email protected] or [email protected]
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Abstract

The strain hardening effect and dynamic recovery behavior of a Ni-based superalloy are studied by isothermal compressive tests. A new unified dislocation-density based constitutive model is developed to characterize the strain hardening effect and dynamic recovery behavior of the studied superalloy. In the developed constitutive model, some material parameters (yield stress, strain hardening coefficient, and dynamic recovery coefficient) are assumed as functions of initial grain size, deformation temperature, and strain rate. An iterative algorithm is designed to predict the high-temperature deformation behaviors under time-variant hot working conditions. The hot deformation parameters and material parameters can be updated in each strain increment. Comparisons between the experimental and calculated flow stresses indicate that the developed constitutive model can accurately describe the high-temperature deformation behavior of the studied superalloy. Furthermore, the developed constitutive model is also successfully used for analyzing time-variant hot working processes.

Keywords

superalloyconstitutive modelstrain hardeningdynamic recoverydislocation density theory
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 24 , 28 December 2015 , pp. 3784 - 3794
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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