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Effect of melting conditions on the thermal expansion coefficient of alloy 36N

  • Precision Steels and Alloys
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    Heating melts of alloy 36N above 1700° leads to rebuilding of short-range order. During cooling of the melt this high-temperature "structure" of the liquid is retained down to the solidification temperature.

  2. 2.

    The condition of the melt before solidification affects the structure of the metal solidified from it. This is confirmed by the change in the coefficient of thermal expansion (TEC) and the lattice constant of samples in relation to the temperature above the liquidus to which the alloy was heated. Samples from melts heated to 1800° were characterized by larger and more consistent values of TEC than samples from the melt heated to temperatures below 1700°.

  3. 3.

    Data on the most probable interatomic distances lead to the assumption that with increasing overheating temperatures the composition of the solid pseudosystem Feϒ1 + Feϒ2 +36% Ni shifts toward a smaller increase in the number of iron atoms in the ϒ2 electronic condition.

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Literature cited

  1. B. A. Baum et al., "Relationship between the properties of liquid and solid steels," in: Problems of Steel Ingots [in Russian], No. 6, Metallurgiya, Moscow (1976), p. 37.

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  2. E. A. Klimenkov et al., "Structural characteristics of Fe−Ni melts," Izv. Akad. Nauk SSSR, Met., (1977).

  3. A. I. Zakharov, "Invariance in the Fe−Ni system and alloys with a given thermal expansion coefficient," in: Precision Alloys [in Russian], No. 2, Metallurgiya, Moscow (1975), p. 53.

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  4. G. A. Mar'in and S. I. Doroshek, "Electronic effects in Fe−Ni Invars," in: Reports of Ural State University [in Russian], Physics of Metals and Their Compounds, No. 2 (1975), p. 120.

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Authors
  1. N. E. Bodakin
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  2. B. A. Baum
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  3. T. K. Kostina
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Additional information

S. M. Kirov Ural Polytechnic Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 62–63, April, 1979.

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Bodakin, N.E., Baum, B.A. & Kostina, T.K. Effect of melting conditions on the thermal expansion coefficient of alloy 36N. Met Sci Heat Treat 21, 323–325 (1979). https://doi.org/10.1007/BF00775122

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  • DOI: https://doi.org/10.1007/BF00775122

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