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Influence of strain-induced martensitic transformations on fatigue crack growth rates in stainless steels

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Abstract

The fatigue crack growth rates (FCGR) of two unstable austenitic stainless steels (Fe-16 Cr-13Ni) and (Fe-18Cr-6.5Ni-0.19C) were determined in theMs-Md temperature range where a strain induced μ → α′ martensitic transformation occurs near the crack tip. These FCGR were compared to the rates measured in the stable austenitic phase of a Fe-31.5Ni and a Fe-34 Ni alloy and in the martensitic phase obtained by quenching the Fe-31.5 Ni alloy below Ms. In the Fe-31.5 Ni, the FCGR are an order of magnitude higher in the martensitic than in the austenitic structures for ΔK ≤ 40 ksi in. The FCGR of the stainless steels decrease markedly when the test temperature approachesM s in theM s - Md range. The FCGR for the alloy Fe-18Cr-6.5 Ni-0.19 C in a warm-worked condition are consistently higher than for the same alloy in the annealed condition for ΔK ≤ 40 ksi √in.. The results are discussed in terms of the influence of phase structures, stacking fault energy and work hardening exponent on the FCGR.

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Authors and Affiliations

  1. Research Laboratories of Ecoledes Mines, Paris, France

    A. G. Pineau (Senior Scientist)

  2. Department of Metallurgy and Materials Science, Massachusetts Institute of Technology, 92139, Cambridge, Mass.

    R. M. Pelloux (Associate Professor)

Authors
  1. A. G. Pineau
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  2. R. M. Pelloux
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Pineau, A.G., Pelloux, R.M. Influence of strain-induced martensitic transformations on fatigue crack growth rates in stainless steels. Metall Trans 5, 1103–1112 (1974). https://doi.org/10.1007/BF02644322

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  • DOI: https://doi.org/10.1007/BF02644322

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