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CLC number: TG142.1

On-line Access: 2011-03-09

Received: 2010-04-07

Revision Accepted: 2010-09-25

Crosschecked: 2011-01-25

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Journal of Zhejiang University SCIENCE A 2011 Vol.12 No.3 P.171-176

http://doi.org/10.1631/jzus.A1000150


Kinetics of austenite grain growth in medium-carbon niobium-bearing steel


Author(s):  Ying-li Zhao, Jie Shi, Wen-quan Cao, Mao-qiu Wang, Gang Xie

Affiliation(s):  School of Material and Metallurgy Engineering, Kunming University of Science and Technology, Kunming 650093, China, Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China

Corresponding email(s):   zhaoyingli@nercast.com

Key Words:  Microalloyed steel, Grain growth, Modeling


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Ying-li Zhao, Jie Shi, Wen-quan Cao, Mao-qiu Wang, Gang Xie. Kinetics of austenite grain growth in medium-carbon niobium-bearing steel[J]. Journal of Zhejiang University Science A, 2011, 12(3): 171-176.

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author="Ying-li Zhao, Jie Shi, Wen-quan Cao, Mao-qiu Wang, Gang Xie",
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pages="171-176",
year="2011",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1000150"
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%T Kinetics of austenite grain growth in medium-carbon niobium-bearing steel
%A Ying-li Zhao
%A Jie Shi
%A Wen-quan Cao
%A Mao-qiu Wang
%A Gang Xie
%J Journal of Zhejiang University SCIENCE A
%V 12
%N 3
%P 171-176
%@ 1673-565X
%D 2011
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1000150

TY - JOUR
T1 - Kinetics of austenite grain growth in medium-carbon niobium-bearing steel
A1 - Ying-li Zhao
A1 - Jie Shi
A1 - Wen-quan Cao
A1 - Mao-qiu Wang
A1 - Gang Xie
J0 - Journal of Zhejiang University Science A
VL - 12
IS - 3
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EP - 176
%@ 1673-565X
Y1 - 2011
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1000150


Abstract: 
In order to locate a reasonable heating system, the austenite grain growth behavior of Nb microalloyed medium carbon steel has been experimentally studied at various austenitizing temperatures and for different holding times. It is indicated that austenite grain growth increases with increasing austenitizing temperatures and holding times. Particularly when the austenitizing temperature was above 1100 °C, austenite grains grew rapidly, and an abnormal austenite grain growth was observed. When the austenitizing temperature was lower than 1100 °C, austenite grain size and growth rate were small. The activation energy of grain growth in the tested steel is 397 679.5 J/mol. To ensure an absence of coarse grains in microstructures, the heating technology of the tested steel should be controlled for 1 h at 1100 °C. The relationships of austenite average grain size with soaking temperature and time of tested steel were obtained by mathematical calculation, and austenite average grain size was found to be in agreement with the measured size for different holding times.

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Reference

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