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Phase chemistry and precipitation reactions in maraging steels: Part I. Introduction and study of Co-containing C-300 steel

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Abstract

This article introduces a series of studies of phase transformations in maraging steels. Atom-probe field-ion microscopy (APFIM) was the main research technique employed. Hardness measurements, transmission electron microscopy (TEM), and thermochemical calculations were also used. The composition and morphology of precipitates in the commercial-grade C-300 steel were compared for different aging times at 510 °C to investigate the aging sequence. Both Ni3Ti and Fe7Mo6 were found to contribute to age hardening. The decomposition starts with the formation of small Mo-enriched Ni3Ti particles at very short aging times. The Fe7Mo6 phase forms at a later stage of aging. The matrix concentrations of both Ti and Mo were measured and were found to be low after standard aging conditions. The observation of the Fe7Mo6 μ phase is supported by thermochemical calculations. Austenite reversion has been found at the aging temperature, and its composition approaches the predicted equilibrium composition after 8 hours of aging.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgy, Cambridge University, CB2 3QZ, Cambridge, UK

    W. Sha

  2. Department of Materials, University of Oxford, OX1 3PH, Oxford, UK

    A. Cerezo (Royal Society Research Fellow) & G. D. W. Smith (University Lecturer)

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  1. W. Sha
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  2. A. Cerezo
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  3. G. D. W. Smith
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Formerly Graduate Student with the Department of Materials, Oxford University.

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Sha, W., Cerezo, A. & Smith, G.D.W. Phase chemistry and precipitation reactions in maraging steels: Part I. Introduction and study of Co-containing C-300 steel. Metall Trans A 24, 1221–1232 (1993). https://doi.org/10.1007/BF02668190

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