原子炉用圧力容器板厚方向靱性勾配材の製造と材料特性

概要

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Nuclear Reactor Pressure Vessel (RPV) suffers the neutron irradiation during operation, which results in preferential decrease of toughness in the internal side of RPV and generation of mechanical properties gradient through its wall thickness. It is expected that even if a crack initiates at the internal surface of such a RPV with gradient toughness under a hypothetical thermal transient, crack propagation will be arrested in the external portion of RPV where the higher toughness is maintained. In order to evaluate the crack arrest characteristics of RPV in laboratory scale, a steel plate with toughness gradient is needed. A 190 mm thick laminated steel plate has been successfully manufactured by hot roll bonding. As the results of mechanical tests on such a steel plate specimen, it is found that this three layer steel plate, can be regarded as a single integral material with toughness gradient through thickness and can be utilized satisfactorily as a testing material for evaluating crack arrest characteristics of RPV. It is also confirmed through the fracture test of this laminated steel plate that a running brittle crack is to be arrested at the layer with higher toughness.
社団法人日本鉄鋼協会の論文
1991-03-01