超高強度低合金TRIP鋼の疲労特性に及ぼす 母相組織と窒素添加の影響

Tomohiko Hojo, Junya Kobayashi, Koh Ichi Sugimoto, Yoshito Takemoto, Akihiko Nagasaka, Motomichi Koyama, Eiji Akiyama

研究成果: Article査読

抄録

To develop ultrahigh-strength steels for automotive impact safety parts, the effects of the microstructure and nitrogen content on the fatigue properties of ultrahigh-strength low alloy transformation-induced plasticity (TRIP)-aided steels with martensite (TM), bainitic ferrite-martensite (TBM), and bainitic ferrite (TBF) matrices were investigated. Compared to TBF steels, both the TM and TBM steels achieved high tensile strength, of more than 980 MPa, and excellent fatigue properties. This results from the suppression of crack propagation due to the effective TRIP of the relatively stable interlath retained austenite and the increase in tensile and yield strengths attributed to the low isothermal transformation treatment. The fatigue strengths of the ultrahigh-strength low alloy TRIP-aided steels were slightly increased by the addition of 100 ppm of nitrogen. The increase in fatigue strength of TM, TBM, and TBF steels with 100 ppm of nitrogen was caused by the fine and uniform martensite and bainitic ferrite matrices and retained austenite, along with the increase in carbon concentration in the retained austenite due to the precipitation of AlN.

寄稿の翻訳タイトルEffects of matrix structure and nitrogen content on fatigue properties of ultrahigh-strength low alloy TRIP-aided steels
本文言語Japanese
ページ(範囲)672-680
ページ数9
ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
107
8
DOI
出版ステータスPublished - 2021 8

Keywords

  • Fatigue properties
  • High-strength steels
  • Nitrogen
  • Retained austenite
  • TRIP-aided steel

ASJC Scopus subject areas

  • 凝縮系物理学
  • 物理化学および理論化学
  • 金属および合金
  • 材料化学

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