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Creep-Rupture Behavior and Recrystallization in Cold-Bent Boiler Tubing for USC Applications...

by John Shingledecker
Publication Type
Conference Paper
Book Title
ADVANCES IN MATERIALS TECHNOLOGY FOR FOSSIL POWER PLANTS
Publication Date
Page Numbers
16 to 28
Volume
N/A
Conference Name
Fifth International Conference on Advances in Materials Technology for Fossil Power Plants
Conference Location
Marco Island, Florida, United States of America
Conference Sponsor
Electric Power Research Institute (EPRI)
Conference Date
-

Creep-rupture experiments were conducted on candidate Ultrasupercritical (USC) alloy tubes to evaluate the effects of cold-work and recrystallization during high-temperature service. These creep tests were performed by internally pressurizing cold-bent boiler tubes at 775�C for times up to 8000 hours. The bends were fabricated with cold-work levels beyond the current ASME Boiler and Pressure Vessel (ASME B&PV) Code Section I limits for austenitic stainless steels. Destructive metallographic evaluation of the crept tube bends was used to determine the effects of cold-work and the degree of recrystallization. The metallographic analysis combined with an evaluation of the creep and rupture data suggest that solid-solution strengthened nickel-based alloys can be fabricated for high-temperature service at USC conditions utilizing levels of cold-work higher than the current allowed levels for austenitic stainless steels.