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Irradiation Assisted Grain Boundary Segregation in Steels

Published online by Cambridge University Press:  26 February 2011

Zheng Lu  and
Roy G Faulkner
Zheng Lu
Affiliation:
zheng.lu@lboro.ac.uk, Loughborough University, IPTME, Ashby Road, Loughborough, LE11 3TU, United Kingdom
Roy G Faulkner
Affiliation:
r.g.faulkner@lboro.ac.uk, Loughborough University, IPTME, Ashby Road, Loughborough, LE11 3TU, United Kingdom
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Abstract

The understanding of radiation-induced grain boundary segregation (RIS) has considerably improved over the past decade. New models have been introduced and much effort has been devoted to obtaining comprehensive information on segregation from the literature. Analytical techniques have also improved so that chemical analysis of layers 1 nm thick is almost routine. This invited paper will review the major methods used currently for RIS prediction: namely, Rate Theory, Inverse Kirkendall, and Solute Drag approaches. A summary is made of the available data on phosphorus RIS in reactor pressure vessel (RPV) steels. This will be discussed in the light of the predictions of the various models in an effort to show which models are the most reliable and easy to use for forecasting P segregation behaviour in steels. A consequence of RIS in RPV steels is a radiation induced shift in the ductile to brittle transition temperature (DBTT). It will be shown how it is possible to relate radiation-induced P segregation levels to DBTT shift. Examples of this exercise will be given for RPV steels and for ferritic steels being considered for first wall fusion applications. Cr RIS in high alloy stainless steels and associated irradiation-assisted stress corrosion cracking (IASCC) will be briefly discussed.

Keywords

neutron irradiationradiation effectsgrain boundaries
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 981: Symposium JJ – Structural and Refractory Materials for Fusion and Fission Technologies , 2006 , 0981-JJ05-09
Copyright
Copyright © Materials Research Society 2007

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