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Phase Stability in Cast HP Austenite After Long-Term Ageing

Published online by Cambridge University Press:  02 July 2020

E.A. Kenik  and
P.J. Maziasz
E.A. Kenik
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN37831-6376
P.J. Maziasz
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN37831-6376
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Extract

Casting of high temperature austenitic alloys is often used to form components and structures required in the chemical industry. Alloy HP is a Nb-stabilized austenitic alloy for such applications. High carbon levels are selected in order to drive the formation of coarse, intergranular precipitates of various carbides. These precipitates provide resistance to high temperature creep by inhibiting grain boundary sliding. While these precipitates are present in the cast material prior to high temperature exposure, it is the stability of these second phase particles during ageing that determines the long-term creep resistance and lifetime of stressed components. This study deals with the phase distribution in a centrifugally-cast HP component from a steam superheater tube in a styrene furnace, which experienced temperatures from 927°C to 1066°C or more for over 105,000 h.

Type
Phase Transformations
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 352 - 353
Copyright
Copyright © Microscopy Society of America

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References

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