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In situ X-ray diffraction measurement method for investigating the oxides films on austenitic stainless steel in simulated pressurized water reactor primary water

渡邉 真史*; 米澤 利夫*; 菖蒲 敬久; 庄子 哲雄*

Watanabe, Masashi*; Yonezawa, Toshio*; Shobu, Takahisa; Shoji, Tetsuo*

Synchrotron X-ray diffraction analytical techniques have been used to investigate the structure of oxide films formed on Type 316L (UNS S31603) austenitic stainless steel in simulated pressurized water reactor primary water. The observed layer structures of the oxide films changed depending on the dissolved hydrogen concentration (DH) in PWR primary water. In two cases, where DH = 5 cm$$^{3}$$/kg (H$$_{2}$$O) or 30 cm$$^{3}$$/kg (H$$_{2}$$O),a (Ni$$_{x}$$Fe($$_{1-x}$$))Fe$$_{2}$$O$$_{4}$$-type spinel oxide was observed as the outer oxide, and a FeCr$$_{2}$$O$$_{4}$$-type spinel oxide was detected as the thin inner oxide. When DH = 30 cm$$^{3}$$/kg (H$$_{2}$$O), the Fe:Ni ratio in the (Ni$$_{x}$$Fe($$_{1-x}$$))Fe$$_{2}$$O$$_{4}$$ outer spinel oxide was much larger than when DH = 5 cm$$^{3}$$/kg (H$$_{2}$$O). In addition, sequential in situ measurements when the hydrogen concentration varied from 5 cm$$^{3}$$/kg (H$$_{2}$$O) to 30 cm$$^{3}$$/kg (H$$_{2}$$O) also demonstrated that the oxide layer structure seemed to adjust its characteristic composition as a function of the DH.

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パーセンタイル:86.18

分野:Materials Science, Multidisciplinary

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