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Cyclic deformation, dislocation structure, and internal fatigue crack generation in a Ti-Fe-O alloy at liquid nitrogen temperature

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Abstract

To clarify the internal fatigue crack generation in a Ti-Fe-O (near α-type) alloy, microstructures, internal fatigue crack initiation sites, and dislocation structures in samples fractured during high-cycle fatigue tests at liquid nitrogen temperature were studied. The alloy contained two kinds of elongated α-phase microstructures, i.e., recovered α grains and recrystallized α grains. Untested samples contained mobile dislocations in recovered α grains, but in recrystallized α grains, any dislocations were observed. Internal crack initiation sites were formed transgranularly and were related to the recrystallized α grain region, judging from their morphology, size, and chemistry. Dislocations in recovered α grains were rearranged after cyclic loading in either \(\left\{ {01\bar 10} \right\} - \left\langle {11\bar 20} \right\rangle \) planar arrays or subgrain structures due to dislocation annihilation. Few dislocations were seen in recrystallized α grains. We discuss the relationship between localized strain incompatibility due to coplanar arrays in recovered α, grains and transgranular cracking in recrystallized α grains, and propose a model for fatigue crack generation.

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Author notes

  1. H. Yokoyama (Graduate Student, Engineer)

    Present address: the Department of Mechanical Engineering, Kogakuin University, 163-8677, Tokyo, Japan

Authors and Affiliations

  1. Nittan Valve Co. Ltd., 257-0031, Kanagawa, Japan

    H. Yokoyama (Graduate Student, Engineer)

  2. the Frontier Research Center for Structural Materials, National Research Institute for Metals, 305-0047, Ibaraki, Japan

    O. Umezawa (Senior Scientist) & K. Nagai (Unit Leader)

  3. the Department of Mechanical Engineering, Kogakuin University, 163-8677, Tokyo, Japan

    T. Suzuki (Emeritus Professor) & K. Kokubo (Professor)

Authors
  1. H. Yokoyama
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  2. O. Umezawa
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  3. K. Nagai
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  4. T. Suzuki
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  5. K. Kokubo
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Yokoyama, H., Umezawa, O., Nagai, K. et al. Cyclic deformation, dislocation structure, and internal fatigue crack generation in a Ti-Fe-O alloy at liquid nitrogen temperature. Metall Mater Trans A 31, 2793–2805 (2000). https://doi.org/10.1007/BF02830339

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  • DOI: https://doi.org/10.1007/BF02830339

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