高張力鋼溶接継手の熱影響部微視組織と破壊じん性

• 亀田 純

  東北大学大学院

• 高橋 秀明

  東北大学工学部

• 鈴木 正彦

  東北大学工学部

書誌事項

タイトル別名

• Microstructure and Fracture Toughness of Heat-Affected-Zone in a Welded Low Alloy Steel

抄録

The fracture toughness in a low alloy welded steel has been examined with particular reference to HAZ microstructures. It is shown that a wide variety of structure in the HAZ adjacent to fusion boundary through thickness is produced by virtue of the different thermal histories experienced by each part in a multi-pass welded low alloy steel. The HAZ microstructures can be classified into seven distinct kinds (named A, B, C, D, E, F and G) according to the microscopic constituent and grain size. Fracture toughness dependence on the HAZ microstructures is demonstrated by instrumented Charpy dynamic Kd and static COD test on small specimens taken from the full thickness welded plate. The slit tip is carefully located in the HAZ adjacent to fusion boundary. The results make it clear that static COD test is more available for assessing fracture toughness dependence on the HAZ microstructures than instrumented Charpy impact test. The martensitic-bainitic HAZ microstructures (A, B and C) which are localized in the vicinity of the weld toe fusion boundary impair most significantly of all the HAZ microstructures. Furthermore, the emphasis must be placed upon the fact that martensitic-bainitic HAZ microstructure G tempered at relative high temperature during following welding process has excellent toughness, although .the microstructure G seems to be similar to the microstructure of weld toe HAZ.

収録刊行物

• 溶接学会誌

  溶接学会誌 45 (6), 457-463, 1976

  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: 1390001206501648512
• NII論文ID: 130003763381
• DOI: 10.2207/qjjws1943.45.457
• 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