Year-end Sale % OFF 
Abstract
In order to investigate the effect on creep strength of the selective oxidation of chromium which causes the formation of a carbide-fi-ee subsurface zone, specimens of Ni22Cr12Co9Mo1Al (Alloy 617) were subjected to heat treatments to simulate a long-term service exposure of a thin-walled heat exchanger tube operating at high temperatures. In creep tests carried out at 900°C, specimens with extensive chromium-depleted and carbide-free subsurface zones exhibited higher creep strength than specimens thermally aged for the same durations, but having no carbide-free zone. The carbon released by dissolution of the carbides in the chromium-depleted zone migrated to the centre of the specimen, producing enhanced carbide precipitation. This led to an increase in the creep strength of the specimen core which offset the loss in creep strength of the subsurface zone.
Submitted Version (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
