原子炉圧力容器鋼の高温および熱衝撃破壊じん性

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タイトル別名
  • The Elevated Temperature and Thermal Shock Fracture Toughnesses of Nuclear Pressure Vessel Steel
  • ゲンシロ アツリョク ヨウキ コウ ノ コウオン オヨビ ネツ ショウゲキ ハ

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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, Jtsc was evaluated from a critical value of stretched zone width, SZWtsc at the initiation of thermal shock fracture by using the relation between SZW and J. The Jtsc value was compared with elastic-plastic fracture toughness values, JIc, and the deference between the Jtsc and JIc values was discussed.<br>The results obtained are summarized as follows;<br>(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 temperature, <br>SZW=95(J/E), <br>where E is Young's modulus.<br>(2) Elevated temperature fracture toughness values ranging from room temperature to 400°C are nearly constant regardless of test temperature. It is confirmed that upper shelf fracture toughness exists.<br>(3) Thermal shock fracture toughness is smaller than elevated temperature fracture toughness within the same high temperature range of thermal shock experiment.

収録刊行物

  • 材料

    材料 28 (308), 421-426, 1979

    公益社団法人 日本材料学会

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