構造用鋼板の衝撃値の異方性と脆性破壊との関連

• 大谷 碧

  大阪大学

• 出口 義治

  日本鋼管技術研究所

• 中本 栄次

  日本鋼管技術研究所

書誌事項

タイトル別名

• Effect of Directionality Induced by Rolling Upon Brittle Fracture of Steel

抄録

It is generally deemed for structural steels that the resistance against brittle fracture in transverse direction to rolling (Y-direction) should be inferior to the one in rolling direction (X-direction), since the notch-impact values for Y-direction are usually fairly smaller than that for X-direction at higher temperature side of transition curves.<BR>Experiments were made to see whether such expectation is correct or not, using two heats of structural high strength steel (60 kg/mm² class), one with no directionality and the other with marked directionality. The fracture and flow stress curves of those steels were investigated in both X and Y-directions, and compared with the results of V-notch charpy test. As the result of the examination, the following were concluded.<BR>(1) Each shape of two fracture stress curves, cleavage and fibrous, was almost the same for both directions in two steels tested.<BR>(2) It was found that the maximum energy absorbed in V-notdh charpy test (_2VE_max) was correlated with the flow stress curve of round bar, measured at higher temperature (80°C), through a parameter, σ₁ε₁+0.2 σ₂ε₂ (cf. Fig. 17). This value, _2VE_max, had no correlation with the cleavage fracture stress curve.<BR>(3) It was revealed in another paper 4) that the fracture stress curves, especially the cleavage type one, were closely related to the brittle fracturing as shown in Figs. 19 and 20.<BR>(4) Then it was proper to conclude, taking into account the considerations above, that the difference in _2VE_max induced by rolling, was of no significance as regards brittle fracturing, provided that the notch-impact values at lower temperature range and the fracture transition temperature were equal.

収録刊行物

• 溶接学会誌

  溶接学会誌 34 (5), 511-519, 1965

  一般社団法人 溶接学会

キーワード

• Metals and Alloys
• Surfaces, Coatings and Films
• Mechanical Engineering
• Mechanics of Materials

詳細情報

• CRID: 1390001206502488576
• NII論文ID: 130003762950
• DOI: 10.2207/qjjws1943.34.511
• ISSN: 18837204
• ISSN: 00214787
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可