Effect of Niobium Addition on Hot Deformation Behaviors of Medium Carbon Ultra-high Strength Steels

The hot deformation behaviors of two medium carbon ultra-high strength steels with different niobium contents were investigated by using Zener-Hollmom parameter and processing map,and the effect of niobium addition on the hot deformation behavior of medium carbon steel was determined.The hot compres...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2017-02, Vol.32 (1), p.162-172
Main Author: 杨秀芝 张李超 史玉升 YU Shengfu HUA Wenlin
Format: Article
Language:English
Subjects:
Carbon
Chemistry and Materials Science
Computer simulation
Deformation
Efficiency
Materials Science
Metallic Materials
Niobium
Steels
Strength
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Summary:The hot deformation behaviors of two medium carbon ultra-high strength steels with different niobium contents were investigated by using Zener-Hollmom parameter and processing map,and the effect of niobium addition on the hot deformation behavior of medium carbon steel was determined.The hot compression tests were conducted on a Gleeble-3500 thermo-mechanical simulator deformed at temperatures from 850 to 1 200 ℃ and strain rates from 0.001 to 1 s^-1.The processing maps of two test steels were built at a true strain of 0.7 based on dynamic materials model（DMM）.There are two peak efficiency domains and two flow instability regions in both test steels.However,the peak efficiency domains of Nb-bearing steel move to higher temperature due to the inhibition of dynamic recrystaUization（DRX）,and the instability domains of Nb-bearing steel are enlarged due to the precipitation of Nb-containing particles during hot deformation.The optimum process parameters of Nb-bearing and Nb-free steels for industrial production were determined according to the processing map and the microstructural observation.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-017-1575-0