Crack Tip Deformation during Dwell Fatigue and Its Correlation with Crack/Fracture Surface Morphologies in a Bi-Modal Ti–6Al–4V Alloy

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  • Aoki Yuma
    Department of Mechanical Engineering, Kyushu University
  • Koyama Motomichi
    Institute for Materials Research, Tohoku University Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University
  • Tanaka Masaki
    Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University Department of Materials Science and Engineering, Kyushu University
  • Tsuzaki Kaneaki
    Department of Mechanical Engineering, Kyushu University Institute for Materials Research, Tohoku University Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University Research Center for Structural Materials, National Institute for Materials Science

Bibliographic Information

Other Title
  • バイモーダルTi-6Al-4V合金におけるDwell疲労中のき裂先端の変形とそのき裂・破面形態との関連
  • バイモーダル Ti-6Al-4V ゴウキン ニ オケル Dwell ヒロウ チュウ ノ キレツ センタン ノ ヘンケイ ト ソノ キレツ ・ ハメン ケイタイ ト ノ カンレン

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Description

<p>We investigated how dwell fatigue loading accelerates the crack propagation in bi-modal Ti–6Al–4V alloy. A fatigue test was programmed to include displacement holding for only one cycle at several ΔK. We found (1) crack tip strain evolved during the displacement holding, (2) the displacement holding increased fatigue striation spacing, and (3) the strain increment during the displacement holding was linearly correlated with spacing of the displacement-holding-extended striations. These facts indicate that the dwell loading assisted crack opening, which accelerated the crack propagation. Other analyses results and discussion are also presented, in terms of crack propagation mode, crack closure, and dislocation structure.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 63 (9), 1232-1241, 2022-09-01

    The Japan Institute of Metals and Materials

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