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Microstructure change of duplex stainless steels after thermal aging and electron beam irradiation

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Title: Microstructure change of duplex stainless steels after thermal aging and electron beam irradiation
Authors: Suzuki, Yuta Browse this author
Hashimoto, Naoyuki Browse this author
Keywords: Spinodal decomposition
Accelerated irradiation
Thermal aging
Issue Date: May-2018
Publisher: Elsevier
Journal Title: Nuclear materials and energy
Volume: 15
Start Page: 208
End Page: 213
Publisher DOI: 10.1016/j.nme.2018.04.013
Abstract: Duplex stainless steel has been used as a structural material for light water reactors. It is well known that the thermal aging during operation causes spinodal decomposition to Cr-rich (alpha') phase and Fe-rich (alpha) phase in the ferrite phase, resulting in brittlement. In order to understand the mechanism of this phenomena and the effect of irradiation, a duplex model alloy (Fe-25Cr-10Ni-2.5Mo-1Mn) prepared by arc melting and thermally aged in the appropriate condition was subjected to accelerated irradiation by a multi-beam ultra-high voltage electron microscope and partially an ion accelerator in this study. Spinodal decomposition of Fe and Cr was confirmed in the model alloy aged at 450 degrees C. In addition, the electron beam irradiation to aged model alloy resulted in the decrease in the amplitude of spinodal decomposition. From this experiment, it was suggested that spinodal decomposition could be suppressed by accelerated irradiation.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 橋本 直幸

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