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Structure of highly pure iron after γ→α transformation at at high cooling rates

  • Theory
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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    In highly pure iron (less than (C+N) 5·10−3 apm; O 0.35 apm) analysis by electron microscope did not reveal signs of martensitic transformation at cooling rates up to the maximally attainable one, viz., 570, 000°K/sec. In iron of commercial-grade purity (C, N, and O, 40 apm each) at cooling rates of more than 350,000°C/sec at step IV (at the temperature of transformation 420°C) a structure of the type of stack martensite is found.

  2. 2.

    The temperature steps of γ→α transformation in rapid cooling depend only weakly on the degree of purity of the iron. The speed of transformation at the temperatures of each step is substantially affected by the degree of purity of the iron: the purer it is, the higher is the speed of transformation. This is due to the change of the speeds of stress relaxation and of the movement of the phase boundary in dependence on the degree of purity of the iron: these speeds increase with greater purity of the iron.

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Authors
  1. D. S. Kamenetskaya
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  2. M. P. Usikov
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  3. V. I. Shiryaev
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Additional information

I. P. Bardin Central Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 8–13, July, 1990.

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Kamenetskaya, D.S., Usikov, M.P. & Shiryaev, V.I. Structure of highly pure iron after γ→α transformation at at high cooling rates. Met Sci Heat Treat 32, 476–482 (1990). https://doi.org/10.1007/BF00700313

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