Effects of Prestraining on High-Cycle Fatigue Strength of High-Strength Low Alloy TRIP-Aided Steels

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概要

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• The effects of prestraining on high-cycle fatigue strength of newly developed low alloy TRIP-aided steels with different matrix structures and different retained austenite characteristics were investigated for automotive applications. Prestraining to 10% in tension increased the fatigue limit of the TRIP-aided steels, especially in steel with a polygonal ferrite matrix. It was considered that the polygonal ferrite matrix brought on high a fatigue limit mainly due to TRIP of the retained austenite and high compressive internal stress in the matrix resulting from a hard second phase on prestraining. On the other hand, the steel with bainitic ferrite lath matrix exhibited only a small increase in the fatigue limit after prestraining. This was expected to be mainly due to "strain-induced martensite hardening" on prestraining, with small contributions of TRIP of compressive internal stress in the matrix. In addition, a very interesting finding was obtained that the internal stress is the most effective parameter among some parameters to increase the fatigue strength in low alloy TRIP-aided steels.

• 社団法人日本材料学会の論文
• 2003-09-15

著者

• Song Sung

  Graduate School Shinshu University:(present Address)misuzu Ind. Corp.

• KOBAYASHI Mitsuyuki

  Department of Mechanical Systems Engineering, Shinshu University

• Kobayashi Mitsuyuki

  Department Of Environmental Science And Technology Shinshu University

• SUGIMOTO Kohichi

  Department of Mechanical Systems Engineering, Shinshu University

• KANDAKA Shinsuke

  Graduate School, Shinshu University

• FUTAMURA Asahiko

  Department of Mechanical Systems Engineering, Shinshu University

• MASUDA Setsuya

  Precision Technical Research Institute of Nagano Prefecture Okaya

• Kandaka Shinsuke

  Graduate School Shinshu University

• Futamura A

  Department Of Mechanical Systems Engineering Shinshu University

• Sugimoto Kohichi

  Department Of Mechanical Systems Engineering Shinshu University

• Futamura Asahiko

  Department Of Mechanical Systems Engineering Shinshu University

• Sugimoto Kohichi

  Department Of Clinical Pharmacology Jichi Medical College

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