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Austenite grain growth in alumina-forming austenitic steel

Published online by Cambridge University Press:  02 May 2016

Qiuzhi Gao ,
Fu Qu ,
Hailian Zhang  and
Qiang Huo
Qiuzhi Gao*
Affiliation:
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Fu Qu
Affiliation:
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Hailian Zhang
Affiliation:
School of Economics and Management, Yanshan University, Qinhuangdao, 066004, China
Qiang Huo
Affiliation:
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Microstructures and austenite grain growth behavior of the alumina-forming austenitic (AFA) steel subjected to normalizing and annealing at various temperatures were investigated. A modified kinetic model of austenite grain growth was constructed based on consideration of the heating history. Abnormal growth of austenite grain occurs when the temperature is increased to 1473 K, and some special large particles of the precipitates located at grain boundaries form when the sample is normalized at the temperature of 1523 K. Both NbC and NiAl precipitates are identified using routine x-ray diffraction. The fitted data based on the kinetic model used and the consideration of the heating history is in agreement with the changes in the austenite grain growth in the AFA steel even when there is abnormal grain growth. The grain growth exponents are shown to be 2.85 and 2.42 for normalizing and annealing, respectively.

Keywords

alumina-forming austenitic steelnormalizingannealingaustenite grain growthkinetic model
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 12 , 28 June 2016 , pp. 1732 - 1740
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Copyright
Copyright © Materials Research Society 2016 

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