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Multi Scale Characterization of Stress Corrosion Cracking of Alloy X750

Published online by Cambridge University Press:  15 January 2013

Kevin Fisher ,
Sébastien Teysseyre  and
Emmanuelle A Marquis
Kevin Fisher
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor MI
Sébastien Teysseyre
Affiliation:
ATR National Scientific User Facility, Idaho National Laboratory, Idaho Falls, ID
Emmanuelle A Marquis
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor MI
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Abstract

Grain boundary chemistry in an X750 Ni alloy was analyzed by atom probe tomography in an effort to clarify the possible roles of elemental segregation and carbide presence on the stress corrosion cracking behavior of Ni alloys. Two types of cracks are observed: straight cracks along twin boundaries and wavy cracks at general boundaries. It was found that carbides (M23C6 and TiC) are present at both twin and general boundaries, with comparable B and P segregation for all types of grain boundaries. Twin boundaries intercept γ’ precipitates while the general boundaries wave around the γ’ and carbide precipitates. Near a crack tip, oxidation takes place on the periphery of carbide precipitate.

Keywords

corrosiongrain boundariesnanoscale
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1519: Symposium MM – Materials under Extreme Environments , 2013 , mrsf12-1519-mm10-02
Copyright
Copyright © Materials Research Society 2013

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References

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