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Precipitation kinetics of M23C6 in T/P92 heat-resistant steel by applying soft-impingement correction

Published online by Cambridge University Press:  17 May 2013

Linqing Xu
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
Dantian Zhang
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and 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 and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
Baoqun Ning
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China; andSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
Zhixia Qiao
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China; andSchool of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, People’s Republic of China
Zesheng Yan
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
Huijun Li*
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: licmtju@163.com
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Abstract

A kinetics model for the precipitation of M23C6 in high Cr ferritic heat resistant steel during tempering has been developed assuming the site-saturated nucleation, carbon diffusion-controlled growth and soft-impingement. The growth coefficient in this model is temperature-dependent, and the Arrhenius equation is applied to describe the growth coefficient, in which the growth activation energy is nearly equal to the diffusion activation energy of carbon in martensite. The effect of main parameters in this model has been discussed in detail. By this model, the precipitation of M23C6 during tempering can be predicted accurately in the case of 2D, and a good agreement with experimental data in previous work has been achieved.

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Articles
Copyright
Copyright © Materials Research Society 2013 

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References

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