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Study on microstructural evolution and constitutive modeling for hot deformation behavior of a low-carbon RAFM steel

Published online by Cambridge University Press:  13 March 2017

Jianguo Chen ,
Yongchang Liu ,
Chenxi Liu ,
Xiaosheng Zhou  and
Huijun Li
Jianguo Chen
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, People’s Republic of China
Yongchang Liu
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, People’s Republic of China
Chenxi Liu*
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, People’s Republic of China
Xiaosheng Zhou
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, People’s Republic of China
Huijun Li
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: cxliutju@163.com
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Abstract

The constitutive equation was established based on the consideration of strain compensation to describe the hot deformation behavior of low carbon reduced activation ferritic/martensitic (RAFM) steels at the temperatures of 850–1050 °C and the strain rates of 0.01–10 s−1. The result indicates that the flow stress is increased with the increase of strain rate but decreased with increase of deformation temperature. During the hot deformation process, the increase of temperature is beneficial to attain the complete dynamic recrystallization (DRX). However, excessively high temperature leads to grow up of dynamic recrystallized grain. Higher strain rate leads to finer recrystallized grains. The material constants (α, n, A) and deformation activation energy (Q) are calculated by the regression analysis. The increase of strain caused the decrease of Q, indicating the DRX occurred more easily. In addition, the developed constitutive equation could accurately predict the hot deformation behavior of the low carbon RAFM steel.

Keywords

low carbon RAFM steelhot compression testsdynamic recrystallizationconstitutive equation
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 7 , 14 April 2017 , pp. 1376 - 1385
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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