Abstract
Intergranular stress corrosion cracking (IGSCC) of Alloy 600 in high-temperature, deaerated water or steam has been termed “hydrogen-induced IGSCC.” We believe these cracks are initiated by the nucleation of a high density of bubbles on the grain boundary under the combined action of the applied stress and high pressure methane formed from carbon in solution reacting with hydrogen injected by corrosion. The bubbles then grow together by grain boundary diffusion to give local failure. This is supported by transmission electron microscope (TEM) observations of two-stage replicas, which show the subsurface formation of closely spaced (0.2μm) bubbles along boundaries, and their growth into fine cracks before they open to communicate with the corroding atmosphere. The kinetics are examined and shown to be in quantitative agreement with several experimental observations. This mechanism involves no grain boundary dissolution of the metal, the only role of corrosion being the injection of hydrogen at a high fugacity. It predicts an activation energy roughly equal to that for grain boundary dψusion of nickel in Alloy 600.
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H. Coriou, L. Grall, Y. De Gall, and S. Vettier:Colloque sur les Matériaux de Reacteurs, Stockholm, Oct. 1959, North-Holland Publishing Co., Amsterdam, The Netherlands, pp. 161–74.
D. van Rooyen:Corrosion, 1975, vol. 31, p. 327.
R. Bandy and D. van Rooyen:Corrosion, 1984, vol. 40, p. 425.
H.R. Copson and G. Economy:Corrosion, 1968, vol. 24, p. 55.
F.P. Ford and P.L. Andresen:Proc. 3rd Int. Sym. Environmental Degradation of Materials in the Nuclear Power Systems, TMS, Warrendale, PA, 1987, p. 789.
E.L. Hall and C.L. Briant:Metall. Trans. A, 1985, vol. 16A, pp. 1225–36.
S.M. Bruemmer and C.H. Henager, Jr.:Proc. 2nd Int. Symp. Environmental Degradation of Materials in Nuclear Power Systems, American Nuclear Society, LaGrange Park, IL, 1985, p. 293.
N. Totsuka and Z. Szklarska-Smialowska:Corrosion, 1987, vol. 43, p. 734.
N. Totsuka, E. Lunarska, G. Cragnolino, and Z. Szklarska-Smialowska:Corrosion, 1987, vol. 43, p. 505.
N. Totsuka and Z. Szklarska-Smialowska:Scripta Metall., 1987, vol. 21, p. 45.
S.J. Green and J.P.N. Paine:Nucl. Technol., 1981, vol. 55, p. 10.
V.B. Rajan, J.K. Sung, and G.S. Was:Proc. 3rd Int. Symp. Environmental Degradation of Materials in Nuclear Reactors, TMS, Warrendale, PA, 1987, pp. 545–50.
M. Guttmann, Ph. Dumoulin, Nguyen Tan-Tai, and P. Fontaine:Corrosion, 1981, vol. 37, p. 416.
P. Combrade, O. Cayla, M. Foucault, D. Vancon, A. Gelpi, and G. Slama:Proc. 3rd Int. Symp. Environmental Degradation of Materials in the Nuclear Power Systems, TMS, Warrendale, PA, 1987, p. 525.
Y.S. Garud and A.R. Mcllree:Corrosion, 1986, vol. 42, p. 99.
P.G. Shewmon:Proc. 7th Int. Conf. on Fracture (ICF7), Houston, TX, Pergamon Press, Mar. 1989, vol. II, p. 1555.
P.G. Shewmon:Mater. Sci. Technol., 1985, vol. 1, p. 1.
R. Raj, H.M. Shih, and H.H. Johnson:Scripta Metall., 1977, vol. 11, p. 839.
A.R. Wazzan:J. Appl. Phys., 1965, vol. 36, p. 3596.
R. Raj:Acta Metall., 1978, vol. 26, p. 995.
J.W. Christian:Theory of Transformation in Metals, Pergamon Press, Oxford, 1965, p. 414.
G.R. Odette and S.S. Vagarali:Metall. Trans. A, 1982, vol. 13A, pp. 299–303.
L.C. Lim and R. Raj:Acta Metall., 1984, vol. 32, p. 727.
A.S. Argon:Scripta Metall, 1983, vol. 17, p. 5.
G. Economy, R.J. Jacko, and F.W. Pement:Corrosion, 1987, vol. 43, p. 727.
Steam Tables: ASME, New York, NY, 1967.
C.H. Shen: Ph.D. Thesis, The Ohio State University, Columbus, OH, 1989.
S.R. Novak and S.T. Rolfe:J. Mater., 1969, vol. 4, p. 701.
W.F. Deans and C.E. Richards:J. Test. Eval., 1979, vol. 7, p. 147.
W.B. Lisagor:Environment-Sensitive Fracture: Evaluation and Comparison of Test Methods, STP 821, 1984, p. 80.
H.E. Ewalds and R.H. Wanhill:Fract. Mech., Arnold Press, Baltimore, MD, 1986, ch. 13.
F. Kohler:Monatsh. Chem., 1960, vol. 91, p. 738.
K. Natesan and T. Kassner:Metall. Trans., 1973, vol. 4, p. 2557.
R.C. Scarberry, S.C. Pearman, and J.R. Crum:Corrosion, 1976, vol. 32, p. 401.
K. Lobl, H. Tuma, and M. Ciznerova:Mem. Sci. Rev. Met., 1974, vol. 71, p. 271.
Tsuguyasu Wada, Harue Wada, J.F. Elliott, and John Chipman:Metall. Trans., 1971, vol. 2, pp. 2199–2208.
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Shen, C.H., Shewmon, P.G. A mechanism for hydrogen-induced intergranular stress corrosion cracking in alloy 600. Metall Trans A 21, 1261–1271 (1990). https://doi.org/10.1007/BF02698254
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DOI: https://doi.org/10.1007/BF02698254