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Knife-edge corrosion of Ni−Mo alloys

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  1. 1.

    To eliminate ICC susceptibility of the knife-edge type in the N70M27F alloy the carbon and iron concentrations should not exceed 0.02 and 1% respectively.

  2. 2.

    The occurrence of knife-edge corrosion in the overheated zone of welded joints in the N70M27F alloy with an elevated concentration of carbon and iron is due to the formation of a continuous network of dendritic carbides of the M6C and Mo2C types in the grain boundaries.

  3. 3.

    Knife-edge corrosion in Ni−Mo alloys can be eliminated by heat treating welded joints at 1050–1100° with subsequent cooling in water or rapid cooling in air.

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Literature cited

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    J. Hockman, Corrosion of Metals [Russian translation], Metallurgizdat (1964).

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    V. Chigal, I. Kamova, and V. Masarzhik, Zashchita Metallov, No. 4 (1968).

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    H. Grafen and G. Bohm, Z. Metallk.,51, No. 5 (1960).

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    M. Kh. Shorshorov and G. I. Klebanov, Testing Methods and the IMET-1 Machine for Investigating Changes in the Structure and Mechanical Properties of Metals during Welding [in Russian], VNITI AN SSSR (1957).

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    Provisional Specifications on Checking Ni−Mo and Ni−Cr−Mo Alloys for ICC, [in Russian], G. L. Shvarts, ed., NIIKhIMMASH, Moscow (1966).

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    Metallography Laboratory, [in Russian], B. G. Livshits, ed., Metallurgizdat, Moscow (1965).

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    R. Stickler and A. Vinkel, Mem. Scien. Rev. Metallurgie,60, No. 78 (1963).

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    A. P. Gulyaev and K. E. Miroshnikova, Metal. i Term. Obrabotka Metal., No. 12 (1965).

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    T. V. Svistunova, in: Reports of the Central Scientific-Research Institute of Ferrous Metallurgy; High-Quality Steels and Alloys, No. 46 [in Russian], Metallurgiya, Moscow (1966).

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Additional information

Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 2–6, May, 1970.

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Svistunova, T.V., Runova, Z.K. & Sakharnov, A.A. Knife-edge corrosion of Ni−Mo alloys. Met Sci Heat Treat 12, 359–363 (1970). https://doi.org/10.1007/BF00662704

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  • Iron
  • Carbide
  • Iron Concentration
  • Elevated Concentration
  • Rapid Cool