薄肉形状を持つ高強度鋼材の遅れ破壊挙動について

概要

論文の詳細を見る
A study of hydrogen embrittlement on high strength steels was carried out with thin walled hollow and thin plate specimens, of which stress state would be plane stress condition, to compare them with solid round bar specimens which had been subjected to plane strain condition. The specimens were cathodically charged with hydrogen under sustained load conditions. The delayed fracture life of thin walled hollow and thin plate specimens lasts longer compared with the solid bar specimens. SEM fractographic examination showed that the essential process of delayed fracture, in which a formation of quasi-cleavage (QC) crack triggers the intergranular (IG) crack after subcritical propagation into a critical size, is unchangeable irrespective of the stress condition. Consequently, total life of the hydrogen charged steel is mainly determined by the period of crack initiation and subcritical growth of the QC crack.
社団法人日本機械学会の論文
1998-10-25