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Microstructure evolution and martensitic transformation behaviors of 9Cr–1.8W–0.3Mo ferritic heat-resistant steel during quenching and partitioning treatment

Published online by Cambridge University Press:  09 October 2013

Linqing Xu ,
Zesheng Yan ,
Yongchang Liu ,
Huijun Li ,
Baoqun Ning  and
Zhixia Qiao
Linqing Xu
Affiliation:
State Key Lab of Hydaulic Engineering Simulation and Safety, School of Materials Science and Engineering, Department of Metallic Materials Science & Engineering, Tianjin University, Tianjin 30072, People's Republic of China
Zesheng Yan
Affiliation:
State Key Lab of Hydaulic Engineering Simulation and Safety, School of Materials Science and Engineering, Department of Metallic Materials Science & Engineering, Tianjin University, Tianjin 30072, People's Republic of China
Yongchang Liu*
Affiliation:
State Key Lab of Hydaulic Engineering Simulation and Safety, School of Materials Science and Engineering, Department of Metallic Materials Science & Engineering, Tianjin University, Tianjin 30072, People's Republic of China
Huijun Li
Affiliation:
State Key Lab of Hydaulic Engineering Simulation and Safety, School of Materials Science and Engineering, Department of Metallic Materials Science & Engineering, Tianjin University, Tianjin 30072, 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
Zhixia Qiao
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: licmtju@163.com
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Abstract

The advanced quenching and partitioning (Q&P) heat treatment has been applied to 9Cr–1.8W–0.3Mo heat resistant steel. The phase transformation during Q&P is measured by a high-resolution differential dilatometer by which the accurate information can be obtained. The transmission electron microscope examination was conducted to study the microstructure evolution after Q&P, and the refined carbon-enriched martensite laths, which were produced during the second martensitic transformation, were observed. The thermodynamics of carbon partitioning was described by a paraequilibrium model according to which the partitioning of carbon from martensite into austenite can be proved. A kinetic model for the second martensitic transformation was developed with the parameters discussed in details. The retardation of onset and end temperature of the second martensitic transformation can be ascribed to the austenite stabilization caused by carbon enrichment.

Keywords

microstructurephase transformationsteel
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 20 , 28 October 2013 , pp. 2835 - 2843
Copyright
Copyright © Materials Research Society 2013 

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