Modeling the Effects of Oversize Solute Additions on Radiation-Induced Segregation in Austenitic Stainless Steels

    Volume 2, Issue 7 (July 2005)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 8 July 2005

    Page Count: 13


    Hackett, MJ
    Graduate Student, University of Michigan, Ann Arbor, MI

    Was, GS
    Professor, University of Michigan, Ann Arbor, MI

    Simonen, EP
    Staff Scientist, Pacific Northwest National Laboratory, Richland, WA

    (Received 11 June 2004; accepted 9 December 2004)

    Abstract

    Oversize solute additions to stainless steels hold promise for reducing radiation-induced segregation (RIS), possibly delaying the onset and severity of irradiation-assisted stress-corrosion cracking (IASCC). The Modified Inverse Kirkendall (MIK) model for RIS in austenitic stainless steels was adapted to include the effects of defect trapping, which is expected to be caused by oversized solutes, on RIS. The model accounts for the sensitivity of RIS to both dose rate and temperature. Model results show that the primary contribution to the reduction in RIS occurs through vacancy trapping and recombination with migrating interstitials, requiring strong solute binding energies on the order of 1.0 eV. The maximum reduction in RIS due to defect trapping increases with dose rate and temperature. The general trends of the model are consistent with experimental data from proton and neutron irradiations.


    Paper ID: JAI12402

    DOI: 10.1520/JAI12402

    ASTM International is a member of CrossRef.

    Author
    Title Modeling the Effects of Oversize Solute Additions on Radiation-Induced Segregation in Austenitic Stainless Steels
    Symposium Effects of Radiation on Materials: 22nd International Symposium, 2004-06-10
    Committee E10