Failure Mechanisms of High Temperature Components in Power Plants

[+] Author and Article Information
R. Viswanathan, J. Stringer

Electric Power Research Institute, Palo Alto, CA 95070

J. Eng. Mater. Technol 122(3), 246-255 (Feb 15, 2000) (10 pages) doi:10.1115/1.482794 History: Received October 15, 1999; Revised February 15, 2000
Copyright © 2000 by ASME
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Illustration of a remaining-life-assessment procedure for a common failure scenario involving crack initiation and propagation. A—embrittlement phenomena. B—unanticipated factors (excess cycling, temperature excursions, corrosion, metallurgical degradation, improper material, excessive stresses). See text for definitions of regions I and II.
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An illustration of a cold start sequence and associated variations of stress (σ), temperature (T), and critical flow size (ac) as a function of time from start
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Typical dissimilar-metal weld locations and failures
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Schematic illustration of an elevated-temperature header (courtesy of B. W. Roberts, Combustion Engineering, Inc.)
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Four types of damage in girth welds in relation to microstructure 8
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Creep cavitation in a T-section of a ferritic steel desuperheater header in a utility boiler
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Rupture in Monroe No. 1 north hot reheat line
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Macrograph of cross-section at location 6LS1, counter-clockwise side of weld sighting along flow; note ID-connected-cracking, located and detected by UT, and extent of cusp damage
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Creep-life assessment based on ca?? classification
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Correlation between damage classification and expended creep-life fraction for 1/4Cr-1/2Mo steels
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Ligament cracking at a tube bore hole viewed from the ID of a header
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Oxide notching at ligament cracks
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TMF cracks in GT29 (CoCrAIY) crating penetrating the INCO 739 base metal
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Typical thermomechanical cycle for a first-stage blade, showing leading-edge strain and temperature variations for normal start-up and shut-down, and an emergency shutdown  




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