Analysis of Creep Deformation Process of Heat Resistant Steels Using Positron Annihilation Lifetime

Masaaki Igarashi; Koji Moriguchi; Seiichi Muneki; Fujio Abe; Yasuharu Shirai

doi:10.4028/www.scientific.net/MSF.561-565.2233

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HomeMaterials Science ForumMaterials Science Forum Vols. 561-565Analysis of Creep Deformation Process of Heat...

Analysis of Creep Deformation Process of Heat Resistant Steels Using Positron Annihilation Lifetime

Abstract:

Creep deformation mechanism of the steels with a different matrix, α (ferrite), α’ (martensite) and γ (austenite), and precipitates such as MX and M23C6 has been analyzed using positron annihilation lifetime measurement. The positron annihilation lifetime has been found to be a very useful tool for evaluating the characteristic creep damage of the steels with different microstructure and the corresponding microstructural evolution during creep deformation. The creep deformation process of the α steel is heterogeneous, while the α’+M23C6 steel exhibits gradual changes in the creep rate in both transient and acceleration creep regions with the largest off-set strain, implying the homogeneous creep deformation. The α’+M23C6+ MX steel is in between the α and α’+M23C6 steels. The homogeneous creep deformation takes place in the γ steel.

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Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

2233-2236

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.2233

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Online since:

October 2007

Authors:

Masaaki Igarashi, Koji Moriguchi, Seiichi Muneki, Fujio Abe, Yasuharu Shirai

Keywords:

Austenite, Creep, Ferrite, Life Prediction, M₂₃C₆, Martensite, MX, Positron Annihilation

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