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Bainitic transformation behavior of ultra-high strength 30CrNi3MoV steel after experiencing small deformation in the nonrecrystallization austenite region

Published online by Cambridge University Press:  11 October 2013

Zhixia Qiao ,
Yongchang Liu ,
Baoqun Ning ,
Huijun Li ,
Zesheng Yan ,
Xiaosheng Zhou  and
Lianjin Li
Zhixia Qiao*
Affiliation:
School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, People’s Republic of China; and School of Material Science and Engineering, Tianjin Key Laboratory of Advanced Jointing Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Yongchang Liu
Affiliation:
School of Material Science and Engineering, Tianjin Key Laboratory of Advanced Jointing Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Baoqun Ning
Affiliation:
School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
Huijun Li
Affiliation:
School of Material Science and Engineering, Tianjin Key Laboratory of Advanced Jointing Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Zesheng Yan
Affiliation:
School of Material Science and Engineering, Tianjin Key Laboratory of Advanced Jointing Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Xiaosheng Zhou
Affiliation:
School of Material Science and Engineering, Tianjin Key Laboratory of Advanced Jointing Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Lianjin Li
Affiliation:
School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, People's Republic of China
*
a)Address all correspondence to this author. e-mail: qzhxia@tjcu.edu.cn
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Abstract

Using a combination of high-resolution dilatometric measurements and microstructural analysis, this study investigated the bainitic transformation behavior in ultra-high strength 30CrNi3MoV steel after experiencing small deformation at 850 °C (in the nonrecrystallization austenite region). Under the influence of the small deformation in the nonrecrystallization austenite region, the bainite starting temperature (Bs) raised, the bainite finishing temperature (Bf) decreased, granular bainite was promoted to form, and intersections of differently oriented bainite laths became more common in the microstructure. The increase of Bs is owing to the stored energy in distorted austenite grain boundaries, which can serve as an extra mechanical driving force for bainitic transformation during continual cooling. The decrease of Bf can attributed to the more universal intersections of bainite laths with different orientations, which can decelerate the overall growth rate of bainite. The promoted formation of granular bainite is closely related to the increase of Bs because granular bainite usually forms at relatively high temperatures in the bainite range, above upper bainite and lower bainite.

Keywords

bainiteultra-high strength steelaustenitedeformation
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 20 , 28 October 2013 , pp. 2844 - 2851
Copyright
Copyright © Materials Research Society 2013 

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References

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