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Influence of heat treatment on the fatigue crack growth rates of a secondary hardening steel

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Abstract

The relationships between microstructure and fatigue crack propagation behavior were studied in a 5Mo-0.3C steel. Microstructural differences were achieved by varying the tempering treatment. The amounts, distribution, and types of carbides present were influenced by the tempering temperature. Optical metallography and transmission electron microscopy were used to characterize the microstructures. Fatigue fracture surfaces were studied by scanning electron microscopy. For each heat treatment the fatigue crack growth properties were measured under plane strain conditions using a compact tension fracture toughness specimen. The properties were reported using the empirical relation of Paris [da/dN = CoΔKm]. It was found that secondary hardening did influence the fatigue crack growth rates. In particular, intergranular modes of fracture during fatigue led to exaggerated fatigue crack growth rates for the tempering treatment producing peak hardness. Limited testing in a dry argon atmosphere showed that the sensitivity of fatigue crack growth rates to environment changed with heat treatment.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of California, 94720, Berkeley, CA

    R. M. Horn (Graduate Student)

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  1. R. M. Horn
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Horn, R.M. Influence of heat treatment on the fatigue crack growth rates of a secondary hardening steel. Metall Trans A 6, 1525 (1975). https://doi.org/10.1007/BF02641963

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  • DOI: https://doi.org/10.1007/BF02641963

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