open access

https://hdl.handle.net/2115/71173

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

英語

Thermal aging

2018-05

Elsevier

Nuclear materials and energy

15

208-213

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.

学術雑誌論文

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Creative Commons Attribution 4.0 International

2352-1791