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TECHNICAL PAPERS

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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References

Clark, M. A., Cervoni, Cheng M., and Chan, W. Y., 1993, “Metallurgical Inspections of High Temperature Steam Piping Systems,” IMechE Conf. Trans., pp. 27–36.
Westwood, H. J., 1993, “Quantitative Microstructural Studies on Creep-Cracked Main Steamline Weldment,” Proc. International Conference on Microstructure and Mechanical Properties of Aging Material, Liaw, P. K., Viswanathan, R., Murty, K. L., Simonen, E. P., and Frear, D., Eds., The Minerals, Metals & Materials Society, pp. 155–165.
Parker, J. D., and Parsons, A. W. J., 1994, “Fracture Behavior of Low Alloy Steel Weldments,” ASME PVP Vol. 288 , pp. 423–428.
Ellis, F. V., 1994, “Creep Rupture Properties of a Failed 2-1/4C-1Mo Longitudinal Seam Weldment,” ASME PVP-Vol. 288 , pp. 165–174.
Viswanathan, R., and Foulds, J. R., 1995, “Failure Experience with Seam-Welded Hot Reheat Pipes in the USA,” ASME PVP-Vol. 303 , pp. 187–205.
Brett, S. J., 1998, “In-Service Cracking Mechanism Affecting, 2CrMo Welds in 1/2CrMoV Steam Pipework Systems,” Proc. International Conference on Integrity of High-Temperature Welds, IOM, London, pp. 3–14.
Ellis, F. V., and Viswanathan, R., 1998, “Review of Type IV Cracking in Piping Weld,” Proc. International Conference on Integrity of High-Temperature Welds, IOM, London, pp. 125–134.
Corum,  J. M., 1990, “Evaluation of Weldment Creep and Fatigue Strength-Reduction Factors for Elevated-Temperature Design,” ASME J. Pressure Vessel Technol., 112, pp. 333–339.
Kimmins, S. T., Coleman, M. C., and Smith, D. J., 1993, “An Overview of Creep Failure with Heat Affected-Zone of Ferritic Weldments,” Proc. 5th International Conference on Creep and Fracture of Engineering Materials and Structures, University College, Swansea, UK, pp. 681–694.
Ogata, T., and Yaguchi, M., 1999, “Fundamental Study on Life Assessment for High Temperature Boiler Weldment Parts,” Proc. International Conference on Case Histories on Integrity and Failures in Industry, EMAS, pp. 123–132.
Brinkman,  C. R., 1985, “High-Temperature Time-Dependent Fatigue Behavior of Several Engineering Structure Alloys,” Int. Met. Rev., 30, pp. 235–258.
Ogata, T. and Nitta, A., 1994, “Creep-Fatigue Damage Assessment Model for Boiler and Turbine Materials in Fossil Power Plant,” ASME PVP-Vol. 276 , pp. 97–105.
Raj, R., and Min, B. K., 1978, “The Effect of Cycle Shape on Creep-Fatigue Interaction in Austenitic Stainless Steels,” ASME PVP-Vol. 3 , pp. 1–8.
Hales,  R., 1980, “A Quantitative Metallographic Assessment of Structural Degradation of TYPE316 Stainless Steel During Creep-Fatigue,” Fatigue Fract. Eng. Mater. Struct., 3, pp. 339–356.
Ogata,  T., and Arai,  M., 1998, “Continuous Observations of Creep-Fatigue Damage Process,” Fatigue Fract. Eng. Mater. Struct., 21, pp. 873–884.
Miller,  D. A., Hamm,  C. D., and Phillips,  J. L., 1982, “A Mechanistic Approach to the Prediction of Creep-dominated Failure During Simultaneous Creep-Fatigue,” Mater. Sci. Eng., 53, pp. 233–244.
ASME Boiler and Pressure Vessel Code Case N-47-28, 1988, ASME, NY.
Ogata, T. and Nitta, A., 1994, “Creep-Fatigue Life Property of FBR High-Temperature Structural Materials Under Tension-Torsion Loading and Life Evaluation Method,” Denchuken Houkoku, CRIEPI, Tokyo, Japan.

Figures

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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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