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Hot deformation behavior and microstructural evolution of Nb–V–Ti microalloyed ultra-high strength steel

Published online by Cambridge University Press:  12 October 2017

Ji Dong ,
Chong Li ,
Chenxi Liu ,
Yuan Huang ,
Liming Yu ,
Huijun Li  and
Yongchang Liu
Ji Dong
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People’s Republic of China
Chong Li*
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, 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 300354, People’s Republic of China
Yuan Huang
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People’s Republic of China
Liming Yu
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, 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 300354, 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 300354, People’s Republic of China; and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
*
a) Address all correspondence to these authors. e-mail: lichongme@tju.edu.cn
b) e-mail: licmtju@163.com
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Abstract

The hot deformation behavior of Nb–V–Ti microalloyed ultra-high strength steel was investigated by isothermal compression at 900–1200 °C with strain rates from 0.01 to 10 s−1. The microstructure evolution and precipitation behavior were studied using an optical microscope and a transmission electron microscope Results indicate that the peak stress of experimental steel increases with increasing the strain rate and decreasing the deformation temperature. The constitutive equation of hot deformation was developed with the activation energy Q being about 407.29 kJ/mol. The processing maps were also obtained to identify the instable regions of the flow behavior and to evaluate the efficiency of hot deformation. The size of dynamically recrystallized grains increases gradually with a decrease in the strain rate. Three types of carbides were identified, namely M3C, rich-Ti MC, and rich-Nb MC. With the increase of the deformation rate, the amounts of carbides increase, and the average sizes of the carbides decrease gradually.

Keywords

Nb–V–Ti microalloyed ultra-high strength steelconstitutive equationprocessing mapmicrostructureprecipitates
Type
Article
Information
Journal of Materials Research , Volume 32 , Issue 19 , 16 October 2017 , pp. 3777 - 3787
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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