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Low-Cycle fatigue crack nucleation and early growth in Ti-17

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Abstract

The mechanisms of low-cycle, fatigue crack nucleation and early growth were investigated at room temperature for Ti-17 (an α+ β titanium alloy). The investigation includedβ processed, high temperature α+ β processed, and low temperaturea + β processed material. The mechanisms of crack nucleation and the path of early crack growth were found to vary with microstructure. Low temperature α+ β processed material demonstrated later crack nucleation but more rapid early crack growth than the other two thermomechanically processed forms. High temperature α+ β processed material containing microstructural flaws, commonly referred to as β-flecks, showed a degradation of fatigue life at high cyclic strain ranges. Results are discussed in terms of microstructural sites of plastic strain concentration.

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Authors and Affiliations

  1. Metallurgical Engineering Department, Michigan Technological University, 49931, Houghton, MI

    A. W. Funkenbusch (Graduate Student)

  2. General Electric Research and Development Center, 12301, Schenectady, NY

    L. F. Coffin (Metallurgist)

Authors
  1. A. W. Funkenbusch
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  2. L. F. Coffin
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Formerly a member of the Research Technology Program, General Electric Research and Development Center

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Funkenbusch, A.W., Coffin, L.F. Low-Cycle fatigue crack nucleation and early growth in Ti-17. Metall Trans A 9, 1159–1167 (1978). https://doi.org/10.1007/BF02652221

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