Study on Creep-Fatigue Damage Evaluation for Boiler Weldment Parts

[+] Author and Article Information
Takashi Ogata, Masatsugu Yaguchi

Central Research Institute of Electric Power Industry, Tokyo 201-8511, Japan

J. Pressure Vessel Technol 123(1), 105-111 (Oct 23, 2000) (7 pages) doi:10.1115/1.1339979 History: Received October 18, 2000; Revised October 23, 2000
Copyright © 2001 by ASME
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Hardness distribution of the weld joint
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Heat treatment condition and microstructures of simulated CGH and FGH—(a) heat treatment condition, (b) microstructures
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Geometry of creep-fatigue test specimen
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Comparison of carbide precipitation and dislocation structures between materials—(a) carbide precipitation, (b) dislocation structures
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Change in maximum tensile stress with cycles
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Comparison of failure life with and without hold time between materials
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Grain boundary cavities observed in cross section
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Type IV cracking observed in the failure specimen tested under creep-fatigue condition
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Comparison between observed life and predicted life by three different methods
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Four material elements FEM mesh profile of the weld joint specimen
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Strain distribution conditions at before and after hold period
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Distribution of stress component along axial direction of the weld joint
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Schematic representation of life prediction flow by nonlinear damage accumulation model
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Comparison of life prediction for different regions in the weld joint by three different methods




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