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Effect of crystallization rate on the structure of alloys in the Nb-Zr-C system

  • Nonferrous Metals and Alloys
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    In niobium alloys containing up to 10% each of Zr and C (atomic fraction) cooled during crystallization at rate of 101–105 °C/sec three phases form: α-solid solution based on niobium, Nb2C carbide with a hcp-lattice, and (Nb, Zr)C type carbide with a fcc-lattice.

  2. 2.

    With crystallization at a rate of vcool=101–103. °C/sec a dendritic structure forms in alloys, at a cooling rate of 105 °C/sec it is cellular, and with an increase in crystallization rate there is a reduction dendrite parameter and cell size (to 1–5 μm with vcool=105 °C/sec).

  3. 3.

    An increase in cooling rate during crystallization from 101 to 105 °C/sec promotes considerable refinement and a change in the nature of carbide phase distribution forming during crystallization.

  4. 4.

    An increase in crystallization rate causes an increase in the amount of carbon and zirconium dissolved in niobium. Subsequent heating up to 1900°C leads to decomposition of rapidly quenched solid solution with separation of dispersed (Nb, Zr)C carbide platelets, but morphology and the amount of eutectic carbide does not change and grain growth is not observed.

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Authors
  1. E. N. Sheftel
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  2. O. A. Bannykh
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  3. G. Sh. Usmanova
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  4. E. V. Markova
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Additional information

A. A. Baikov Institute of Metallurgy, Moscow. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 32–35, April, 1989.

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Sheftel, E.N., Bannykh, O.A., Usmanova, G.S. et al. Effect of crystallization rate on the structure of alloys in the Nb-Zr-C system. Met Sci Heat Treat 31, 271–277 (1989). https://doi.org/10.1007/BF00715802

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  • DOI: https://doi.org/10.1007/BF00715802

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