The isothermal decomposition of austenite in a high purity Iron-Chromium binary alloy View Full Text


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Article Info

DATE

1978-04

AUTHORS

J. V. Bee, R. W. K. Honeycombe

ABSTRACT

The transformation characteristics of a series of high purity iron-chromium alloys, within the γ-loop composition range, have been studied using continuous-cooling dilatometry. An Fe-10 wt pct Cr alloy, which exhibited a relatively slow γ → α transformation, was chosen for detailed investigation by isothermal dilatometry, and by optical and transmission electron microscopy. The TTT diagram exhibited a high-temperature Ccurve in which the transformation products were equiaxed ferrite and Widmanstätten ferrite, the latter developing from perturbations on the α:γ interface. In this range, a ledge mechanism was the predominant mode of ferrite growth. A simple activation energy analysis suggests that the γ→ α reaction is interface controlled, and supports the existence of a “solute-drag” effect by carbon even at low concentrations. Direct quenching of the alloy produced martensite. In the intermediate temperature range, it is proposed that the γ→ α reaction is bainitic in character. More... »

PAGES

587-593

References to SciGraph publications

  • 1972-05. A debate on the bainite reaction in METALLURGICAL TRANSACTIONS A
  • 1973-10. Nucleation limitation and hardenability in METALLURGICAL TRANSACTIONS A
  • 1971-09. The morphology of martensite in iron alloys in METALLURGICAL TRANSACTIONS A
  • Journal

    TITLE

    Metallurgical Transactions A

    ISSUE

    4

    VOLUME

    9

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf02646416

    DOI

    http://dx.doi.org/10.1007/bf02646416

    DIMENSIONS

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