Abstract
The aging and inservice degradation of industrial equipment has underscored a need for efficient and reliable evaluation of the suitability of such equipment for continued service. The structural components of traditional energy production facilities, such as fossil- and nuclear-fueled electric power plants, are prime examples of aging equipment for which integrity during extended service is of major concern. The paper describes a recently developed nondisruptive miniature material sample removal and test approach that is being applied to a range of operating electric power plant components from turbine generators to pressure vessels, and to petrochemical plant reactor vessels for inservice integrity assessment. Thein situ removal of a thin wafer-like sample (less than 25 mm in diameter and 2.5 mm in thickness) from the component surface generally has no effect on component integrity. The miniature specimen small punch (disk bend) test has been developed to mechanically test the as-removed material, and is being used to estimate the material tensile behavior and fracture properties (ductile-to-brittle transition temperature and fracture toughness) required for a reliable component integrity assessment.
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References
D. W. Mercaldi, Surface Sampling Device, U.S. Patent No. 4,845,896, Failure Analysis Associates, Inc., Menlo Park, California (1989).
J. R. Foulds, C. W. Jewett, L. H. Bisbee, T. L. Gabel, and R. Viswanathan,In-service steam turbine rotor material evaluation by small punch testing, inSteam Turbine-Generator Developments for the Power Generation Industry, PWR-Vol. 18, W. G. Steltz, ed. (ASME, New York, 1992), p. 151.
J. R. Foulds, C. W. Jewett, L. H. Bisbee, G. A. Whicker, and R. Viswanathan, Miniature sample removal and small punch testing for in-service component material FATT, inClean Steels Technology, Proceedings of the R. I. Jaffee Memorial Symposium, R. Viswanathan, ed. (ASM International, Ohio, 1992), p. 101.
J. D. Parker. A. McMinn, and J. Foulds, Material sampling for the assessment of component integrity, inLife Assessment and Life Extension of Power Plant Components, PVP-Vol. 171, T. V. Narayananet al., eds. (ASME, New York, 1989), p. 223.
Failure Analysis Associates, Inc., Menlo Park, CA, Unpublished Work (1988–1995).
M. L. Hamilton and F. H. Huang, Use of the disk bend test to assess irradiation performance of structural alloys, inThe Use of Small Scale Specimens for Testing Irradiated Material, ASTM STP 888, W. R. Corwin and G. E. Lucas, eds. (ASTM, Philadelphia, PA, 1986), p. 5.
G. E. Lucas, Review of small specimen test techniques for irradiation testing,Met. Trans. A 21A:1105 (1990).
J. R. Foulds and C. W. Jewett, Miniature Specimen Test Technique for Toughness Assessment, Final Report on EPRI Project RP1957-10, EPRI GS-7526, Electric Power Research Institute, Palo Alto, CA (1991).
J. R. Foulds, P. J. Woytowitz, T. K. Parnell, and C. W. Jewett, Fracture Toughness by Small Punch Testing, Final Report on EPRI Project RP2426-38, EPRI TR105130, Electric Power Research Institute, Palo Alto, CA (1995).
J. M. Baik, J. Kameda, and O. Buck, Small punch test evaluation of intergranular embrittlement of an alloy steel,Scripta Metall. 17:92 (1983).
V. Gensheimer DeGiorgi, G. C. Kirby III, and M. I. Jolles, Prediction of classical fracture initiation toughness,Eng. Fract. Mech. 33:773 (1989).
H. Takahashi, T. Shoji, and H. D. Jeong, Residual life assessment and nondestructive evaluation of material degradation in fossil power plant components by means of small punch test, Proceedings, International Conference on Life Assessment and Extension, Paper 2.7.2, The Hague, Nederlands Intituut voor Lacstechniek, The Netherlands (1988).
J. Foulds and R. Viswanathan, Small punch testing for determining the material toughness of low alloy steel components in service,J. Eng. Mater. Technol. 116:457 (1994).
R. Viswanathan and S. Gehl, Nondestructive assessment of temper embrittlement in turbine rotor steels, ASME,J. Eng. Mater. Technol. 113:263–269 (1991).
J. R. Foulds, P. J. Woytowitz, T. K. Parnell, and C. W. Jewett, Fracture toughness by small punch testing,J. Test. Eval. 23:3 (1995).
X. Mao, T. Shoji, and H. Takahashi, Characterization of fracture behavior in small punch test by combined recrystallization-etch method and rigid plastic analysis,J. Test. Eval. 15, 30 (1987).
X. Mao, M. Saito, and H. Takahashi, Small punch test to predict ductile fracture toughnessJ lc and brittle fracture toughnessK lc ,Scripta Metall. 25:2481 (1991).
D. E. Meyers, F. C. Chen, J. Zhang, and A. J. Ardell, Optimization of test parameters for quantitative stress measurements using the miniaturized disk-bend test,J. Test. Eval. 21:263 (1993).
J. Zhang and A. J. Ardell, Measurement of the fracture toughness of ceramic materials using a miniaturized disk-bend test,J. Am. Ceram. Soc. 76:1340 (1993).
M. P. Manahan, A. E. Browning, A. S. Argon, and O. K. Harling, Miniaturized disk bend test technique development and application, inThe Use of Small Scale Specimens for Testing Irradiated Material, ASTM STP 888, W. R. Corwin and G. E. Lucas, eds. (ASTM, Philadelphia, PA, 1986), p. 17.
B. Engelmann, NIKE2D, A Nonlinear, Implicit, Two-Dimensional Finite Element Code for Solid Mechanics, Lawrence Livermore National Laboratory Report UCRL-MA-105413 Livermore. CA (1991).
J. R. Foulds, C. W. Jewett, A. H. Kadarman, and R. G. Lott, Small Punch Testing for Irradiation Embrittlement—A Preliminary Feasibility Study, Final Report on EPRI Project RP8046-03, EPRI TR105131, Electric Power Research Institute, Palo Alto, CA (1995).
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Foulds, J.R., Viswanathan, R. Nondisruptive material sampling and mechanical testing. J Nondestruct Eval 15, 151–162 (1996). https://doi.org/10.1007/BF00732042
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DOI: https://doi.org/10.1007/BF00732042