Conclusions
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1.
A continuous network of carbides in the grain boundaries is the basic reason for the susceptibility of alloy N70M28 to ICC after heating at high temperatures.
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2.
The susceptibility to ICC in the high-temperature range is eliminated by the addition of 3.5–5.3% W, while the addition of 1.1–2.6% Ti and 0.012–0.12% Zr increase the susceptibility to ICC at these temperatures.
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3.
The susceptibility of alloy N70M28 to ICC in the low-temperature range is due to the formation of the intermetallic phase Ni4Mo and the accompanying stresses. Strong carbide-forming elements (tungsten, titanium, and zirconium) have no effect on the susceptibility to ICC in the low-temperature range.
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Literature cited
S. S. Pavlov and T. V. Svistunova, Metal. i Term. Obrabotka Metal., No. 11 (1968).
D. Harker, jtJ. of Chemical Physics,12, No. 7 (1944).
E. N. Vlasova, Fiz. Metal. Metalloved.,23, No. 5 (1967).
Additional information
Moscow Institute of Chemical Machine Construction; Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 20–22, October, 1970.
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Pavlov, S.S., Svistunova, T.V. Intercrystalline corrosion in alloys of the N70M28 type. Met Sci Heat Treat 12, 830–832 (1970). https://doi.org/10.1007/BF00654467
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DOI: https://doi.org/10.1007/BF00654467