KBb番号/045照射脆化による材質変化
KBb番号:045
モード:材質変化
メカニズム①:劣化
'メカニズム②:照射脆化
特徴:中性子の照射により引張強さは変化しないが,硬くなり降伏応力は上昇する・その結果,延性脆化遷移温度が上昇し,室温においても脆性破壊を起こすようになる・なお,オーステナイト系ステンレス鋼においては,377℃~627℃の温度範囲でボイドが形成され靭性が低下する・
主たる材料:低合金鋼,ステンレス鋼,ニッケル基合金
事例:
KBb番号:045
モード:材質変化
メカニズム①:劣化
'メカニズム②:照射脆化
特徴:中性子の照射により引張強さは変化しないが,硬くなり降伏応力は上昇する・その結果,延性脆化遷移温度が上昇し,室温においても脆性破壊を起こすようになる・なお,オーステナイト系ステンレス鋼においては,377℃~627℃の温度範囲でボイドが形成され靭性が低下する・
主たる材料:低合金鋼,ステンレス鋼,ニッケル基合金
事例:
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