Shear-mode Crack Initiation Behavior in the Martensitic and Bainitic Microstructures

Kentaro Wada, Soma Yoshimura, Tomoko Yamamoto, Yoshihiro Ohkomori, Hisao Matsunaga

研究成果: ジャーナルへの寄稿Conference article

抄録

Fully reversed torsional fatigue tests were conducted to elucidate the behaviour of shear-mode crack initiation and propagation in one martensitic and two bainitic steels. The relationship between the crack initiation site and microstructure was investigated by means of an electron backscatter diffraction (EBSD) technique. From the S-N diagram, two notable results were obtained: (i) the shear-mode crack was initiated on the prior austenitic grain boundary in martensitic steel, while in bainitic steels, the crack was initiated along the {110} plane; one of the slip planes of bcc metals, and (ii) the torsional fatigue limit of lower bainitic steel with finer grains was 60 MPa higher than that of upper bainitic steel with coarser grains even though the hardnesses were nearly equivalent. The mechanism determining the torsional fatigue strength in these steels is discussed from the viewpoint of microstructure morphology.

元の言語英語
記事番号04009
ジャーナルMATEC Web of Conferences
165
DOI
出版物ステータス出版済み - 5 25 2018
イベント12th International Fatigue Congress, FATIGUE 2018 - Poitiers Futuroscope, フランス
継続期間: 5 27 20186 1 2018

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Steel
Crack initiation
Microstructure
Fatigue of materials
Cracks
Martensitic steel
Electron diffraction
Crack propagation
Grain boundaries
Metals
Hardness

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Engineering(all)

これを引用

Shear-mode Crack Initiation Behavior in the Martensitic and Bainitic Microstructures. / Wada, Kentaro; Yoshimura, Soma; Yamamoto, Tomoko; Ohkomori, Yoshihiro; Matsunaga, Hisao.

:: MATEC Web of Conferences, 巻 165, 04009, 25.05.2018.

研究成果: ジャーナルへの寄稿Conference article

Wada, Kentaro ; Yoshimura, Soma ; Yamamoto, Tomoko ; Ohkomori, Yoshihiro ; Matsunaga, Hisao. / Shear-mode Crack Initiation Behavior in the Martensitic and Bainitic Microstructures. :: MATEC Web of Conferences. 2018 ; 巻 165.
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AU - Matsunaga, Hisao

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Y1 - 2018/5/25

N2 - Fully reversed torsional fatigue tests were conducted to elucidate the behaviour of shear-mode crack initiation and propagation in one martensitic and two bainitic steels. The relationship between the crack initiation site and microstructure was investigated by means of an electron backscatter diffraction (EBSD) technique. From the S-N diagram, two notable results were obtained: (i) the shear-mode crack was initiated on the prior austenitic grain boundary in martensitic steel, while in bainitic steels, the crack was initiated along the {110} plane; one of the slip planes of bcc metals, and (ii) the torsional fatigue limit of lower bainitic steel with finer grains was 60 MPa higher than that of upper bainitic steel with coarser grains even though the hardnesses were nearly equivalent. The mechanism determining the torsional fatigue strength in these steels is discussed from the viewpoint of microstructure morphology.

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