SYMPOSIA PAPER Published: 01 January 2004

Inter-Granular Phosphorus Segregation in Ferritic Steels


Progress in modeling irradiation-assisted non-equilibrium and equilibrium inter-granular segregation in steels is discussed. Solute drag and rate theory models for non-equilibrium segregation are compared. Reference is made to recent MD simulation work on irradiated grain boundaries in alpha iron.

Predictions of the models for phosphorus inter-granular segregation are compared with several recently published experimental data from pressure vessel steels. These are as follows. • A summary of results from field emission gun scanning transmission electron microscopy (FEGSTEM) and Auger Electron Spectrometry (AES) for a variety of dose and dose rate conditions. • A systematic survey of results from variable dose rate experiments. • Results from a recent systematic data set produced from C-Mn steel submerged arc welds.

The fits of the predictions to the observations show the strong influence of site competition from carbon on the final phosphorus inter-granular segregation level.

Author Information

Faulkner, RG
IPTME, Loughborough University, Loughborough, Leics, UK
Flewitt, PEJ
Berkeley Centre, Berkeley, Glos., UK
Lu, Z
IPTME, Loughborough university, Loughborough, Leics, UK
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Developed by Committee: E10
Pages: 553–564
DOI: 10.1520/STP11256S
ISBN-EB: 978-0-8031-5494-0
ISBN-13: 978-0-8031-3477-5