溶接熱影響部の応力除去焼鈍と破壊靱性(<特集>鉄鋼材料の破壊靱性)

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Transition curves of Charpy impact value and COD were measured on high strength steels, HT60 and HT80, which were subjected to synthetic welding thermal cycle and SR (stress relief) annealing at 600℃ and 650℃. The cooling rate of welding thermal cycle was chosen so as to give not so different hardness between "as welded" and "SR" conditions in the same steel. The following conclusions are obtained. (1) Specimen HT-80 stress-relieved at 600℃ suffers from temper embrittlement characterized by intercrystalline fracture and high fracture-appearence transition temperature _υT_<γs> in Charpy impact test. Other specimens fracture in a cleavage mode at low temperature. (2) The temperature at which COD assumes 0.10 mm, δT_<0.10>, is set to be a measure of brittle fracture initiation temperature. δT_<0.10> was found to be much lower than that predicted from _υT_<γs> in the specimen of intercrystalline fracture type. On the other hand, evaluation of toughness depends not so much on which measure _υT_<γs> or δT_<0.10> is employed in specimens of cleavage fracture type. (3) It was found that the high dependency of fracture appearance transition temperature on strain rate is a cause of the extra-ordinary relation between _υT_<γs> and δT_<0.10> in specimens of intercrystalline fracture type. Then it can be concluded that an appropriate strain rate should be selected in toughness test in accordance with the service condition of the objective steel structure.
社団法人日本鉄鋼協会の論文
1978-06-01

溶接熱影響部の応力除去焼鈍と破壊靱性(<特集>鉄鋼材料の破壊靱性)

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