603 原子炉用黒鉛の破壊靭性に及ぼす酸化消耗の影響(OS4-(1)オーガナイズドセッション《材料と組織》)

概要

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Graphites are used as the core structural materials of the high temperature gas-cooled reactors (HTGR) because they have good nuclear properties and high strength at high temperatures. Trace amount of impurities contained in the helium coolant oxidize slowly them during the long operations, their microstructures are degraded by burn-off, and the mechanical properties and the fracture toughness decrease. Therefore it is necessary to study on the effect of burn-off on the material properties and the microstructures. In this study, two kinds of graphites are supplied to oxidation test in air and to fracture toughness test by tension specimen with ring slit. As the results obtained, the fracture toughness of graphites applied tension decreased larger than that without tension. The fracture toughness of IG-110 decreased abruptly below burn-off 1% and that of IG-11 changed little under the condition without tension.
一般社団法人日本機械学会の論文
2011-08-26