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The effect of composition on the pressure-induced HCP (∈) transformation in iron

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Abstract

The pressure-induced phase transformations in iron-rich Fe−Mn and Fe−Ni−Cr alloys were studied using an opposed diamond anvil high-pressure X-ray diffraction unit and a liquidmedium hydrostatic pressure apparatus. Transformations occurring with both increasing and decreasing pressure were studied. It was found that alloy additions of manganese and of nickel plus chromium significantly reduce the formation pressure of the hcp phase and can in some cases stabilize the phase enough to prevent it from transforming into some other phase during pressure release. All of the transformations are shown to be martensitic. Pressurization of prepolished surfaces, a large transformation pressure hysteresis, and the “abaric” formation of the ∈ phase establish the transformation as martensitic.

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Authors and Affiliations

  1. Alloy Development Section, Homer Research Laboratories, Bethlehem Steel Corp., Bethlehem, Pa.

    P. M. Giles (Engineer) & A. R. Marder (Supervisor)

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  1. P. M. Giles
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  2. A. R. Marder
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Giles, P.M., Marder, A.R. The effect of composition on the pressure-induced HCP (∈) transformation in iron. Metall Trans 2, 1371–1378 (1971). https://doi.org/10.1007/BF02913362

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  • DOI: https://doi.org/10.1007/BF02913362

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