熔接用諸鋼材の連続冷却変態図(第7報)

• 関口 春次郎

  名古屋大学工学部

• 稲垣 道夫

  名古屋大学工学部

書誌事項

タイトル別名

• Continuous Cooling Transformation Diagrams of Various Steels Submitted to Welding (Report 7)
• On 90 kg/mm<SUP>2</SUP> Low Alloy Steel
• 90 kg/mm<SUP>2</SUP>低合金鋼について

抄録

For the steel DT containing low carbon, Ni, Mo, V and B, of which ultimate tensile strength is about 90 kg/mm² in the state quenched from 930°C and water cooled after tempering for 1hr at 630°C, as well as USS "T-1" steel, the continuous cooling transformation diagram in case of maximum heating temperature 1350°C was constructed. Then this continuous cooling transformation diagram was compared with that obtained in case of maximum heating temperature 1093°C by Nippes, Savage and Allio.<BR>The following results were obtained :<BR>1. The A₃-transformation point of steel DT is extremely low. In the continuous cooling transformation diagram, the time at the Ac₃ temperature 833°C was adopted as 0 sec of a datum point.<BR>2. Critical cooling times of steel DT are determined as follows ; C_z'=6 sec, C_f'=18 sec, C_p'=56 sec, C_e'>2000 sec. The cooling time corresponding to 50% martensite is 18.5 sec, namely, near the value of C_f'.<BR>3. The positions of the beginning curves and the ending curves of each consitituents of microstructures in the authors' continuous cooling transformation diagram in case of maximum heating temperature 1350°C, remove to the longer cooling time and lower temperature side, compared with those in the continuous cooling transformation diagram in case of maximum heating temperature 1093°C constructed by Nippes, Savage and Allio.<BR>4. In the author's continuous cooling transformation diagram, critical cooling time C_z', C_f', C_p', 50% martensite cooling time and others are determined, but in that diagram by Nippes, Savage and Allio, C_z' critical cooling time was only determined and 4.6 sec of the value is smaller than 6 sec of the author's value.

収録刊行物

• 溶接学会誌

  溶接学会誌 28 (12), 864-870, 1959

  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: 1390001206501647616
• NII論文ID: 130003762765
• DOI: 10.2207/qjjws1943.28.864
• 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