ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 8 July 2005
Page Count: 13

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

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.

Keywords:
modeling, segregation, oversize solute addition, grain boundary, austenitic stainless steel, chromium, vacancy, interstitial

Paper ID: JAI12402
DOI: 10.1520/JAI12402
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