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Temperature and Strain-Rate Effects on Deformation Mechanisms in Irradiated Stainless Steel

Published online by Cambridge University Press:  16 February 2011

J. L. Brimhall ,
J. I. Cole ,
J. S. Vetrano  and
S. M. Bruemmer
J. L. Brimhall
Affiliation:
Pacific Northwest Laboratory(a), P.O. Box 999, Richland, WA 99352
J. I. Cole
Affiliation:
Pacific Northwest Laboratory(a), P.O. Box 999, Richland, WA 99352
J. S. Vetrano
Affiliation:
Pacific Northwest Laboratory(a), P.O. Box 999, Richland, WA 99352
S. M. Bruemmer
Affiliation:
Pacific Northwest Laboratory(a), P.O. Box 999, Richland, WA 99352
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Abstract

Analysis of the deformation microstructures in ion-irradiated stainless steel shows twinning to be the predominant deformation mode at room temperature. Dislocation channelling also occurs under slow strain rate conditions. Stresses required for twinning were calculated by the model of Venables and are compatible with observed yield stresses in neutron-irradiated material if loops are the principal twin source. Computation of the expected radiation hardening from the defect structure, based on a simple model, is consistent with yield strengths measured on neutron-irradiated steels. Lower yield stresses and greater thermal energy at 288°C lessen the probability of twinning and dislocation channeling becomes the primary deformation mode at the higher temperature. However, preliminary results show that some twinning does occur in the irradiated stainless steel even at the higher temperature when higher strain rates are used.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 373: Symposium Y – Microstructure of Irradiated Materials , 1994 , 177
Copyright
Copyright © Materials Research Society 1995

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References

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