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Refinement of Irradiation and Analysis Techniques for Radiation-Induced Segregation

Published online by Cambridge University Press:  15 February 2011

T. R. Allen ,
J. M. Cookson ,
D. L. Damcott  and
G. S. Was
T. R. Allen
Affiliation:
Department of Nuclear Engineering and Radiological Sciences University of Michigan, Ann Arbor, M1 48109
J. M. Cookson
Affiliation:
Department of Nuclear Engineering and Radiological Sciences University of Michigan, Ann Arbor, M1 48109
D. L. Damcott
Affiliation:
Department of Nuclear Engineering and Radiological Sciences University of Michigan, Ann Arbor, M1 48109
G. S. Was
Affiliation:
Department of Nuclear Engineering and Radiological Sciences University of Michigan, Ann Arbor, M1 48109
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Abstract

Radiation-induced segregation (RIS) has been implicated as a potential contributor to irradiation assisted stress corrosion cracking in light water reactor core components. To better understand changes to grain boundary chemistry during irradiation, RIS was measured in ultra-high purity (UHP) 304 stainless steel using Auger electron spectroscopy (AES). Variations in measured grain boundary concentration, both within a sample and between samples, are reduced by refinements in both the radiation and the AES techniques. These refinements include improvements in temperature control, uniformity of sample-to-sample dose, grain boundary acceptance criteria, amount of intergranular fracture, and amount of beam current used in analysis. AES measurements on samples irradiated at 400°C to 1.0 dpa show how implementing the technique refinements reduces the variability in the measured concentrations. Additionally, measurements from regions of ductile tearing in samples irradiated to 0.1 and 1.0 dpa at 400°C, to 1.0 dpa at 200°C, and from unirradiated samples show that sensitivity factors must be determined to obtain the most accurate measurement of grain boundary composition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 439: Symposium B – Microstructure Evolution During Irradiation , 1996 , 557
Copyright
Copyright © Materials Research Society 1997

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References

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