Phase chemistry and precipitation reactions in maraging steels: Part I. Introduction and study of Co-containing C-300 steel |
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| Authors: | W. Sha A. Cerezo G. D. W. Smith |
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| Affiliation: | (1) Department of Materials Science and Metallurgy, Cambridge University, CB2 3QZ Cambridge, UK;(2) Department of Materials, University of Oxford, OX1 3PH Oxford, UK |
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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. Formerly Graduate Student with the Department of Materials, Oxford University. |
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