Ｎｂ‐Ｖ系高張力鋼再現溶接熱影響部の応力除去焼なましぜい化におよぼす溶接入熱の影響

• 佐藤 誠

  新日本製鉄(株)鉄構海洋事業部相模原技術センター

• 武田 鉄治郎

  新日本製鉄(株)第2技術研究所

• 金谷 研

  新日本製鉄(株)第2技術研究所

書誌事項

タイトル別名

• On the effect of weld heat input on stress relief embrittlement of duplicated weld heat-affected zone for Nb-V type high tensile steel.

抄録

Studies are made on stress relief embrittlement of duplicated weld HAZ for 50 kgf/mm² HTS. Degree of stress relief embrittlement expressed by Δ_∇Ts is a function of weld thermal cycle cooling rate, and results showed that the highest notch toughness of stress-relieved weld HAZ was achieved in microstructure containing slight polygonal ferrite. That sort of microstructure can be obtained with thermal cycles cooling time of around 30 seconds from 800°C to 500°C for steels investigated, which shows the effectiveness for obtaining the safety of welded joints and the efficiency of welding fabrication by using comparatively high heat input of around Cf cooling time in SH-CCT diagram.<BR>Furthermore, grain boundary fracture was little found for both as duplicated and duplicated and stress-relieved HAZ, showing the significance of niobium and vanadium nitride and carbide coherent precipitation for stress relief embrittlement in weld HAZ, as it occurs transgranular cleavage fracture easily.

収録刊行物

• 溶接学会論文集

  溶接学会論文集 2 (4), 691-699, 1984

  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: 1390001204721678464
• NII論文ID: 130003934676
• DOI: 10.2207/qjjws.2.691
• ISSN: 24348252
• ISSN: 02884771
• 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