Summary
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1.
The susceptibility to intercrystalline corrosion is induced by the precipitation of carbides when these form a continuous or slightly broken chain.
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2.
The difference in the electrochemical potentials between the continuous chain of carbides and austenite is the reason for intercrystalline corrosion.
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3.
When the carbide chain is broken into separate carbide particles far removed from each other then corrosion is localized around each carbide particle and does not penetrate into the bulk of the metal along the grain boundaries.
Then the steel is not susceptible to intercrystalline corrosion.
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4.
We did not find any impoverishment of the austenite grain boundaries in chromium in steel susceptible to intercrystalline corrosion.
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Literature cited
E. Bain, “Chemistry and Industry” (1932), Vol. 51.
R. Stickler and A. Vinckier, “Mem. Scient. rev. metallurgie” (1963), Vol. 60, No. 7-8.
A. P. Gulyaev and Yu. S. Medvedev, MiTOM (1962), No. 2.
M. M. Kristal', M. B. Shapiro, and N. I. Moskvin, Reports of the All-Union Scientific Research and Design Institute of Chemical Machine Construction, No. 37 [in Russian] (1961).
P. A. Akol'zin, V. N. Gulyaev, N. P. Talov, and E. N. Ivanov, Teploénergetika (1963), No. 8.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 2–5, December, 1965
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Gulyaev, A.P., Miroshnikova, K.E. Intercrystalline corrosion of some stainless steels. Met Sci Heat Treat 7, 776–780 (1966). https://doi.org/10.1007/BF00666964
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DOI: https://doi.org/10.1007/BF00666964