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Processing maps and microstructural evolution of the type 347H austenitic heat-resistant stainless steel

Published online by Cambridge University Press:  23 June 2015

Yinghui Zhou ,
Yongchang Liu ,
Xiaosheng Zhou ,
Chenxi Liu ,
Liming Yu ,
Chong Li  and
Baoqun Ning
Yinghui Zhou
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Yongchang Liu*
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Xiaosheng Zhou
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Chenxi Liu
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Liming Yu
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Chong Li
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, 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
*
a)Address all correspondence to this author. e-mail: licmtju@163.com
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Abstract

To study the thermal deformation behavior and microstructural evolution of the type 347H austenitic steel, compression experiments were conducted at the temperatures of 800–1100 °C with strain rates of 0.01–10 s−1. The activation energy and constitutive equation of the type 347H steel during thermal deformation process were determined according to the flow stress curves. Both the hot processing maps and microstructure characteristics under different deformation conditions were investigated. Based on the thermal processing maps, two unstable regions under 800 °C/0.01–10 s−1 and 1100 °C/0.01 s−1 were identified. The processing maps were in favor of optimizing thermal processing parameters and improving thermal processing properties of the type 347H austenitic steel. After thermal deformation, the dislocation in the austenite matrix increases significantly. Besides, in the stable regions, the precipitation of carbides is facilitated by thermal deformation.

Keywords

austenitic steelmicrostructural evolutionprocessing mapsthermal deformation
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 13 , 14 July 2015 , pp. 2090 - 2100
Copyright
Copyright © Materials Research Society 2015 

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