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Report No.
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High performance FBR core material development by means of grain boundary engineering

Yamashita, Shinichiro   ; Yano, Yasuhide  ; Sakaguchi, Norihito*; Watanabe, Seiichi*; Kokawa, Hiroyuki*; Kawai, Masayoshi*

In this study, grain boundary character distribution (GBCD)-optimized Type 316 corresponding austenitic stainless steel has been developed as a nuclear material for next generation energy systems. Some of steel sheets were cold-rolled additionally for making the GBCD-optimized and cold-worked (GBCD+CW) specimens. These specimens, including as GBCD-optimized, were examined tensile strength property, phase stability during high temperature thermal ageing and irradiation property. The GBCD was assessed by orientation imaging microscopy (OIM) and also the microstructure by TEM. The OIM results showed that the average grain sizes and the frequencies of CSL boundaries in the typical specimens were 40-47 $$mu$$m and more than 70%. Totally considered all experimental results, it was indicated that it is highly possible to develop high performance FBR core material by means of grain boundary engineering.

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