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Origin and Influence of Pre-Existing Segregation on Radiation-Induced Segregation In Austenitic Stainless Steels

Published online by Cambridge University Press:  15 February 2011

E. A. Kenik ,
J. T. Busby ,
M. K. Miller ,
A. M. Thuvander  and
G. Was
E. A. Kenik
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376, kenikea@oml.gov
J. T. Busby
Affiliation:
University of Michigan, Ann Arbor, MI 48109
M. K. Miller
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376
A. M. Thuvander
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376
G. Was
Affiliation:
University of Michigan, Ann Arbor, MI 48109
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Abstract

The pre-existing segregation at grain boundaries in two austenitic stainless steels has been investigated by atom probe field ion microscopy and analytical electron microscopy. In addition, the effect of radiation-induced segregation on the near-grain-boundary composition has been studied by analytical electron microscopy. Pre-existing enrichment of Cr, Mo, B, C and P and depletion of Fe and Ni near grain boundaries has been observed. Significant affinity between Mo and N in both alloys is indicated by the detection of MoN2+` molecular ions during field evaporation. The pre-existing segregation is modified by radiation-induced segregation resulting in Ni and Si enrichment near the boundary as well as depletion of chromium adjacent to the boundary resulting in a “W-shaped” Cr profile.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 540: Symposium N / Microstructural Processes in Irradiated Materials , 1998 , 445
Copyright
Copyright © Materials Research Society 1999

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