Stress Dependence of Microstructural Evolution in Heat Resistant Steels

Yoshinori Murata; Yoshihiro Saoto; Yuhki Tsukada; Toshiyuki Koyama; Masahiko Morinaga; Yasutoshi Sasaki; Yasushi Hasegawa

doi:10.4028/www.scientific.net/MSF.654-656.190

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HomeMaterials Science ForumMaterials Science Forum Vols. 654-656Stress Dependence of Microstructural Evolution in...

Stress Dependence of Microstructural Evolution in Heat Resistant Steels

Abstract:

The state of the microstructure of ferritic heat resistant steels during creep was evaluate by the system free energy, which composes mainly chemical free energy, surface energy and elastic strain energy, and its stress dependence was expressed quantitatively by using a relaxation time. The steels used in this study were P91 (9Cr-1Mo-C-N-V-Nb) steel and P92 (9Cr-Mo-W-C-N-V-Nb-B) steel. The obtained results are as follows: (1) the relaxation time of elastic strain energy was expressed as a function of stress and temperature, (2) surface energy of P92 scarcely decreased during creep due to the formation of the Laves phase, and (3) the relaxation time of the chemical free energy in P92 was larger than that in P91.

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Periodical:

Materials Science Forum (Volumes 654-656)

Pages:

190-193

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.654-656.190

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Online since:

June 2010

Authors:

Yoshinori Murata, Yoshihiro Saoto, Yuhki Tsukada, Toshiyuki Koyama, Masahiko Morinaga, Yasutoshi Sasaki, Yasushi Hasegawa

Keywords:

Creep, Ferritic Steel, Heat Resistant, System Free Energy

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References

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