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Fatigue-induced phase formation and its deformation behavior in a cobalt-based superalloy

  • M. L. Benson (a1), T. A. Saleh (a1), P. K. Liaw (a1), H. Choo (a2), D. W. Brown (a3), M. R. Daymond (a4), X. -L. Wang (a5), A. D. Stoica (a5), R. A. Buchanan (a1) and D. L. Klarstrom (a6)...

Abstract

The low-cycle fatigue behavior of a cobalt-based superalloy was studied in situ using neutron–diffraction experiments. The alloy exhibited stress-induced formation of a hexagonal-close-packed (hcp) phase within its parent face-centered-cubic (fcc) phase at ambient temperature under strain-controlled fatigue conditions with a total strain range, Δε=2.5%. The (101) hcp peak was first observed during the 12th fatigue cycle under the given conditions following a period during which no hcp phase was detected. Subsequently, the intensity of the hcp peaks increased as fatigue progressed. Furthermore, within a single fatigue cycle, the intensity of the (101) hcp peak decreased during the compression half-cycle and increased again when the specimen was subjected to a subsequent tensile strain. The result suggests that the fcc to hcp transformation is partially reversible within one fatigue cycle.

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Corresponding author

a)Electronic mail: mbenson2@utk.edu

References

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Fatigue-induced phase formation and its deformation behavior in a cobalt-based superalloy

  • M. L. Benson (a1), T. A. Saleh (a1), P. K. Liaw (a1), H. Choo (a2), D. W. Brown (a3), M. R. Daymond (a4), X. -L. Wang (a5), A. D. Stoica (a5), R. A. Buchanan (a1) and D. L. Klarstrom (a6)...

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