Structure change of ODS steel by creep annealing

Yamazaki, Jin*; Onuma, Masato*; Otsuka, Satoshi ; Tanno, Takashi ; Toyama, Takeshi*; Mitsuhara, Masatoshi*; Nakashima, Hideharu*

X-ray small angle scattering (SAXS) analysis was carried out in order to evaluate the stability of nano-sized dispersed oxide particles in oxide dispersed strengthened (ODS) steels after creep test. The size of oxide particles was not changed after creep tests at 800 $^{circ}$ C and below. On the other hand, the size tended to increase in the sampled tested at over 800 $^{circ}$ C. However, the SAXS analysis showed that the nano-sized Y $_{2}$ Ti $_{2}$ O $_{7}$ oxide particle still existed in the sample after the creep test at 1000 $^{circ}$ C. The result shows that dispersed nano-sized oxide particles in ODS steels have superior stability under creep test at high temperature.

Language	:	Japanese
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Meeting title	:	日本金属学会2021年春期(第168回)講演大会
Held date	:	2021/03
Location (city)	:	online
Location (country)	:	日本
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Keywords	:	ODS鋼; 酸化物分散粒子; クリープ; 小角散乱
Research Facility	:	MMF(照射材料試験施設)
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Cooperating Institute	:	九州大学; 東北大学; 北海道大学

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Registration No. : BB20200868
JAEA Abstracts No. :
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