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Fatigue crack propagation in trip steels

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Abstract

The fatigue crack propagation behavior of a class of metastable austenitic steels called TRIP steels has been investigated. The alloy composition was chosen to have theMs well below room temperature and theMD above room temperature after thermomechanical processing. A simple theoretical model of fatigue crack propagation (FCP) based on fracture mechanics was developed. Fatigue crack propagation tests on SEN specimens at various stress intensity ranges (ΔK) were carried out, and two stage plastic-carbon replica were used to observe the fracture surface of the FCP specimens. To a first approximation, both the experimental and theoretical results followed the usual relationship between ΔK and FCP rates;i.e. da/dn ∝ (ΔK).4 The fatigue fracture surface contained fatigue striations, quasicleavage and elongated dimples; a reflection of the complex structure of TRIP steels. A beneficial effect of strain induced martensite transformation with regards to fatigue crack propagation was found. TRIP steels showed better FCP properties than a number of alloy steels of similar strength levels and compared favorably with mar aging steels in the low ΔK range.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgical Engineering, University of Cincinnati, Cincinnati, Ohio

    G. R. Chanani (Post-Doc-torial Fellow and Associate Professor of Materials Science) & Stephen D. Antolovich (Post-Doc-torial Fellow and Associate Professor of Materials Science)

  2. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minn.

    W. W. Gerberich (Associate Professor)

Authors
  1. G. R. Chanani
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  2. Stephen D. Antolovich
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  3. W. W. Gerberich
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Chanani, G.R., Antolovich, S.D. & Gerberich, W.W. Fatigue crack propagation in trip steels. Metall Trans 3, 2661–2672 (1972). https://doi.org/10.1007/BF02644242

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  • DOI: https://doi.org/10.1007/BF02644242

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