熔接が鋼材の切缺脆性に及ぼす影響について(第3報)

• 大谷 碧

  鉄道技術研究所

• 太田 省三郎

  鉄道技術研究所

書誌事項

タイトル別名

• Effect of Welding on the Notch Sensitivity of Mild Steel (3rd Report)

抄録

Notched bead bend specimen of Lehigh type was used to evaluate the influence of welding on the notch sensitivity of structural mild steels. The test pieces werc arc welded manually and compared with the unwelded base plates. Some of them were cooled to -10°C and them welded to examine the effects of different welding temperatures. The ductility transition temperatures (T_ra or Tφ) were determined by measuring Ghe.bend angle at maximum load (a_M) or the lateral contraction below notch (φ_BN) respectively, and the fracture transition temperature (T_rs) was decided by the fracture appearance.<BR>Tests results revealed that T_ra and Tφ were seriously raised after arc welding except one killed steel, accompanied by great reductions of a_M and φ_BN. So a considerable danger of susceptibility to crack growth may be said to be present in heat affected zones. On the other hand, T_rS was hardly influenced by welding;namely, it was indicated that the transition temperature of welded joint might not rise particularly when a crack, initiated in the heat-affected zone, plopagated into the base plate The increase of hardness was also slight in specimens welded at -10°C, and their transition temperatures were exactly the same as those welded at room temperature.<BR>At the same time, it was proved that there existed satisfactory correlations between transition temperatures of steels determined by various test methods, if they were classified in to the fracture and ductility transition temperature and compared between each group. For example, T_rs correlated well to the transition temperature determined by the fracture appearance in the Kahn tear test, and T_ra also did so to 15 ft-1bs. transition temperature measured by the V-notched Charpy test.

収録刊行物

• 溶接学会誌

  溶接学会誌 22 (10-12), 359-367, 1953

  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: 1390001206500792704
• NII論文ID: 130003762536
• DOI: 10.2207/qjjws1943.22.359
• 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