Si-Mn鋼のギガサイクル疲労特性に及ぼす改良オースフォームの影響

• 古谷 佳之

  物質・材料研究機構

• 松岡 三郎

  物質・材料研究機構

書誌事項

タイトル別名

• The Effect of Modified-ausforming on Giga-cycle Fatigue Properties in Si-Mn Steels
• 力学特性 Si-Mn鋼のギガサイクル疲労特性に及ぼす改良オースフォームの影響
• リキガク トクセイ Si Mn コウ ノ ギガサイクル ヒロウ トクセイ ニ オヨボス カイリョウ オースフォーム ノ エイキョウ

抄録

This report reveals gigacycle fatigue properties for a modified-ausformed Si-Mn steel (SMn443) with the chemical composition of 0.42C-0.2Si-1.52Mn in mass%. The Si-Mn steel has an advantage in recycling since the steel does not contain Cr and Mo which are difficult to be removed in re-melting. On the other hand, disadvantages of the Si-Mn steel are low tempering resistance and low hardenablility.<BR>Modified-ausformed, oil-quenched and water-quenched steels were prepared for fatigue tests, followed by tempering at 473K and 673K to prepare two different strength specimens. The tensile strengths of steels tempered at 473K and 673K were nearly 1400 MPa and 2000 MPa, respectively. The problem of hardenablility was solved by modified-ausforming, while the tempering resistance was not improved. The low-strength modified-ausformed steel (AF1400) was free from fish-eye fracture with a fatigue limit of 770 MPa at 10⁹ cycles, while the low strength oil-quenched steel (QT1400) caused fish-eye fracture. Although the high-strength modified-ausformed steel (AF2000) was suffered from fish-eye fracture, the fatigue limit at 10¹⁰ cycles was 830 MPa that was higher than 710 MPa of the water-quenched steel (QT2000W) tempered at 473K. The fatigue limit at 10⁹ or 10¹⁰ cycles for both oil-quenched steels (QT1400 and QT2000) could not be determined because of temperature increase of specimens in 20 kHz tests. The fracture surfaces revealed optically dark areas (ODA) even in modified-ausformed steel since the modified-ausforming was not perfect in this research.

収録刊行物

• 鉄と鋼

  鉄と鋼 89 (10), 1082-1089, 2003

  一般社団法人 日本鉄鋼協会

キーワード

• gigacycle fatigue
• Si-Mn steel
• modified-ausforming
• fish-eye fracture
• optically dark area

詳細情報

• CRID: 1390282680159299840
• NII論文ID: 110001457519
• NII書誌ID: AN00151251
• DOI: 10.2355/tetsutohagane1955.89.10_1082
• ISSN: 18832954
• ISSN: 00211575
• ISSN: http://id.crossref.org/issn/00211575
• NDL書誌ID: 6689782
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6689782
• Web Site: https://www.jstage.jst.go.jp/article/tetsutohagane1955/89/10/89_10_1082/_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