亜鉛メッキ高張力鋼の拡散性水素挙動と遅れ破壊

• 鈴木 信一

  パーカーS ・ NI業(株) (元新日本製鐵(株))

• 石井 伸幸

  新日本製鐵(株)棒線営業部(現: (財),産業創造研究所)

• 宮川 敏夫

  日鉄ボルテン(株)

書誌事項

タイトル別名

• Diffusible Hydrogen Behavior and Delayed Fracture of Zinc-electrogalvanized High Strength Steel
• アエン メッキ コウチョウリョク コウ ノ カクサンセイ スイソ キョドウ ト

抄録

Diffusible hydrogen behavior in zinc electrogalvanized high strength steel has been investigated by use of a newly developed hydrogen content determining method for better understanding of delayed fracture of electrogalvanized high strength steel.<BR>For as-electrogalvanized high strength steel, there are two peaks on the hydrogen evolution rate curve at 200°C and 350°C from room temperature to 600°C. After electrogalvanizing and baking at 200°C for 4 hours, 200°C peak becomes very low but 350°C peak shows still the same as before. Hydrogen at 200°C peak is diffusible and relates to delayed fracture of high strength steel. Hydrogen at 350°C peak is undiffusible and does not relate to delayed fracture. Hydrogen diffusion remarkably falls down by electrogalvanized zinc layer. In as-electrogalvanized high strength steel with 8μ zinc layer, diffusible hydrogen content is about 0.23ppm and decreases to 0.03ppm after baking at 200°C for 4 hours.<BR>In as-electrogalvanized and carburized high strength bolt with 8μ zinc layer, there are two peaks on the evolution rate curve at 150°C and 327°C. The former is diffusible hydrogen and its content is 0.69ppm. This diffusible hydrogen decreases to 0.10 ppm after baking at 190°C for 5 hours. It is investigated to show the diagram of relationships about baking time-diameter of bolt-change of initial hydrogen content.<BR>Diffusion coefficient of carburized high strength M8 bolt with 8μ zinc layer at 190°C is about 2.36 × 10^-45.91 × 10^-4 mm²/sec.

収録刊行物

• 鉄と鋼

  鉄と鋼 82 (2), 170-175, 1996

  一般社団法人 日本鉄鋼協会

キーワード

• delayed fracture
• diffusible hydrogen
• high strength steel
• electrogalvanizing
• baking

詳細情報

• CRID: 1390001205182153856
• NII論文ID: 110001481474
• NII論文ID: 10003875975
• NII書誌ID: AN00151251
• DOI: 10.2355/tetsutohagane1955.82.2_170
• ISSN: 18832954
• ISSN: 00211575
• ISSN: http://id.crossref.org/issn/00211575
• NDL書誌ID: 3918177
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3918177
• Web Site: https://www.jstage.jst.go.jp/article/tetsutohagane1955/82/2/82_2_170/_pdf
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可