Volume 13, Issue 3 (May 1985)

    A Positron Study of the Quench and Tempering Process in AISI 4340 Steel

    CODEN: JTEOAD

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    Abstract

    Dopper broadening measurements of the gamma-ray spectra produced by positron annihilation have been made on an AISI 4340 (Unified Numbering System [UNS] G43400) steel as a function of both isochronal tempering over the temperature range of 150 to 700°C and isothermal tempering at 250°C for times ranging from 1 to 1100 min. Changes in the positron annihilation line shape parameter S are correlated with the corresponding structural transformations that accompany tempering of the as-quenched steel. Of particular significance is the increase in the S parameter in the temper embrittlement regime. This increase in S parameter is postulated to be related to the precipitation of a transition iron carbide that alters the defect structure of the surrounding ferrite phase.


    Author Information:

    Moore, KD
    Graduate student and associate professor, Duke University, Durham, NC

    Jones, PL
    Graduate student and associate professor, Duke University, Durham, NC


    Stock #: JTE10782J

    ISSN: 0090-3973

    DOI: 10.1520/JTE10782J

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    Author
    Title A Positron Study of the Quench and Tempering Process in AISI 4340 Steel
    Symposium , 0000-00-00
    Committee C16