Abstract
Large-diameter Type 304 stainless steel pipe weld heat-affected zone (HAZ) was investigated to determine the rate at which low temperature sensitization (LTS) can occur in weld HAZ at nuclear reactor operating temperatures and to determine the effects of LTS on the initiation and propagation of intergranular stress corrosion cracks (IGSCC). The level of sensitization was determined with the electrochemical potentiokinetic reactivation (EPR) test, and IGSCC susceptibility was determined with constant extension rate tests (CERT) and actively loaded compact tension (CT) tests. Substructural changes and carbide compositions were analyzed by electron microscopy. Weld HAZ was found to be susceptible to IGSCC in the as-welded condition for tests conducted in 8-ppm-oxygen, high-purity water at 288 °C. For low oxygen environments (i.e., 288 °C/0.2 ppm O2 or 180 °C/1.0 ppm O2), IGSCC susceptibility was detected only in weld HAZ that had been sensitized at temperatures from 385 °C to 500 °C. Lower temperature heat treatments did not produce IGSCC. The microscopy studies indicate that the lack of IGSCC susceptibility from LTS heat treatments below 385 °C is a result of the low chromium-to-iron ratio in the carbide particles formed at grain boundaries. Without chromium enrichment of carbides, no chromium depleted zone is produced to enhance IGSCC susceptibility.
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General Electric Company, Palo Alto, CA, Electric Power Research Institute, Final Report for Project 449-2, A.J. Giannuzzi, principal investigator, Dec. 1978, NP-944.
General Electric Company, Palo Alto, CA, Electric Power Research Institute, Final Report for Project 1332-1, F. P. Ford, principal investigator, Sept. 1982, NP-2589.
J. C. Danko: fromProceedings: Second Seminar on Countermeasures for Pipe Cracking in BWRs, Volume 3,Remedy Application, organized by J. C. Danko, Palo Alto, CA, Nov. 15-18, EPRI NP-3684-SR, p. 1-1.
C. Stawström and M. Hillert:Journal of the Iron and Steel Institute, 1969, vol. 207, pp. 77–85.
E. C. Bain, R. H. Aborn, and I. B. Rutherford:Trans. Am. Soc. Steel Treatment, 1933, vol. 21, pp. 481–509.
C. S. Tedmon, D. A. Vermilyea, and J. H. Rosolowski:Journal of the Electrochemical Socien, 1971, vol. 118, pp. 192–202.
J. S. Armijo:Corrosion, 1968, vol. 24, pp. 24–30.
K.T. Aust:Trans. AIME, 1969, vol. 245, pp. 2117–26.
A. Joshi and D. F. Stein:Corrosion, 1972, vol. 28, pp. 321–30.
M.J. Povich:Corrosion, 1978, vol. 34, pp. 60–65.
M. J. Povich and R. Rao:Corrosion, 1978, vol. 34, pp. 269–75.
W. L. Clarke, R. L. Cowan, and W. L. Walker: inIntergranular Corrosion of Stainless Alloys, ASTM STP 656, R. F. Steigerwald, ed., American Society for Testing and Materials, 1978, pp. 99-132.
ASTM Specifications E647-83, paragraph 9,Annual Book of ASTM Standards, Philadelphia, PA, 1983.
A. Saxena and S.J. Hudak, Jr.:Int. J. Fracture, 1978, vol. 14, pp. 453–68.
P. L. Andresen: Palo Alto, CA, Electric Power Research Institute, Seminannual Report 2 for EPRI Project T-115-3, Dec. 1980.
General Electric Company, Palo Alto, CA, Electric Power Research Institute, GE Final Report on EPRI Project 1972-1, May 1981, NP-1823.
General Electric Company, Palo Alto, CA, Electric Power Research Institute, GE Final Report for EPRI Project T 118-1, July 1982, vols. 1 and 2, NP-2472-SY.
C. Da Casa, V. B. Nileshwar, and D. A. Melford:Journal of the Iron and Steel Institute of London, 1969, vol. 207, pp. 1325–32.
J. Philibert, G. Henry, M. Robert, and J. Pineau:Mem. Sci. Rev. Met., 1961, vol. 58, p. 557.
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Schmidt, C.G., Caligiuri, R.D., Eiselstein, L.E. et al. Low temperature sensitization of type 304 stainless steel pipe weld heat affected zone. Metall Trans A 18, 1483–1493 (1987). https://doi.org/10.1007/BF02646660
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DOI: https://doi.org/10.1007/BF02646660