Microstructural Aspects of Irradiation Damage in A508 Gr 4N Forging Steel: Composition and Flux Effects

    Volume 1, Issue 5 (May 2004)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 10 May 2004

    Page Count: 14


    Burke, MG
    Advisory Scientist and Senior Engineer, Bettis Atomic Power Laboratory, West Mifflin, PA

    Stofanak, RJ
    Advisory Scientist and Senior Engineer, Bettis Atomic Power Laboratory, West Mifflin, PA

    Hyde, JM
    Team Leader and Consultant, AEA Technology, Didcot, OX

    English, CA
    Team Leader and Consultant, AEA Technology, Didcot, OX

    Server, WL
    President, ATI Consulting, Pinehurst, NC

    (Received 25 November 2002; accepted 17 April 2003)

    Abstract

    Neutron irradiation can promote significant changes in the microstructure and associated mechanical properties of low alloy steels. In particular, irradiation can induce the formation of non-equilibrium phases and segregation, which may lead to a degradation in toughness. In this study, the microstructural changes caused by neutron irradiation have been characterized in A508 Grade (Gr) 4N-type steels (∼3.5% Ni) using a variety of state-of-the-art analytical techniques including 3D-Atom Probe Field-Ion Microscopy and Small Angle Neutron Scattering, along with post-irradiation annealing studies combining Positron Annihilation Lineshape Analysis and hardness measurements. Important differences between conventional and “superclean” A508 Gr 4N steel have been identified in this investigation. The data indicate that Ni is not the controlling factor in the irradiation damage behavior of these materials; rather, the Mn content of the steel is a dominant factor in the irradiation-induced microstructural development of solute-related hardening features.


    Paper ID: JAI11773

    DOI: 10.1520/JAI11773

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    Author
    Title Microstructural Aspects of Irradiation Damage in A508 Gr 4N Forging Steel: Composition and Flux Effects
    Symposium The Effects of Radiation on Materials: 21st International Symposium, 2002-06-20
    Committee E10