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The strength, fracture toughness, and low cycle fatigue behavior of 17-4 PH stainless steel

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Abstract

The influence of microstructure on the strength, fracture toughness and low cycle fatigue behavior of 17-4 PH stainless steel has been examined. Aging hardening involves initial formation of coherent copper-rich clusters which transform to incoherent fee ∈-copper precipitates upon further aging. The changes in strength level and strain hardening rates observed during aging are consistent with previously suggested models for precipitation hardening based on differing elastic moduli. The fracture toughness and fatigue crack growth rates were shown to be a function of microstructure and environment. At equivalent strength levels overaging resulted in a higher fracture toughness than did underaging. The fatigue crack growth rates increased with increasing strength level and humidity but were not a function of toughness level. Attempts to correlate the fatigue crack growth rates with monotonie tensile properties were unsuccessful. However when final failure obeyed a critical strain criteria, the fracture toughness behavior could be reasonably described and related to preferential void nucleation and growth at δ-ferrite-matrix interfaces.

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Authors and Affiliations

  1. Sandia Laboratories, 87115, Albuquerque, N. Mex.

    H. J. Rack (Member of Technical Staff)

  2. Bell Telephone Laboratories, 30071, Norcross, Ga.

    David Kalish (Member of Technical Staff)

Authors
  1. H. J. Rack
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  2. David Kalish
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Rack, H.J., Kalish, D. The strength, fracture toughness, and low cycle fatigue behavior of 17-4 PH stainless steel. Metall Trans 5, 1595–1605 (1974). https://doi.org/10.1007/BF02646331

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