原子炉圧力容器鋼の高温および熱衝撃破壊じん性

概要

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Thermal shock experiments were conducted on nuclear pressure vessel steel A533 Grade B Class 1. Elastic-plastic fracture toughness tests were carried out within the same high temperature range of the thermal shock experiment and the relation between stretched zone width, SZW and J-integral was clarified. An elastic-plastic thermal shock fracture toughness value, J_<tsc> was evaluated from a critical value of stretched zone width, SZW_<tsc>. at the initiation of thermal shock, fracture by using the relation between SZW and J. The J_<tsc> value was compared with elastic-plastic fracture toughness values, J_<Ic> and the diference between the J_<tsc> and J_<Ic> values was discussed . The results obtained are summarized as follows; (1) The relation between SZW and J before the initiation of stable crack growth in fracture toughness test at a high temperature can be expressed by the following equation regardless of test tem perature, SZW= 95 (J/E), where E is Young's modulus. (2) Elevated temperature fracture toughness values ranging from room temperature to 400℃ are nearly constant regardless of test temperature. It is confirmed that upper shelf fracture toughness exists. (3) Thermal shock fracture toughness is smaller than elevated temperature fracture toughness within the same high temperature range of thermal shock experiment.
社団法人日本材料学会の論文
1979-05-15