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Structure and properties of low-carbon steels and iron after deformation under superplasticity conditions

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Conclusions

  1. 1.

    The superplasticity effect during upsetting of low-carbon steels develops in the temperature range Ac1S-Ac3S, to a greater extent close to Ac3S with deformation rates\(\dot \varepsilon\)≅ sec−1, and it is characterized by a simultaneous reduction in deformation resistance, absence of residual hardening for ferrite, and deformation predominantly by a grain boundary sliding mechanism.

  2. 2.

    After superplastic deformation in the temperature range Ac1S-Ac3S the microstructure of low-carbon steels is characterized by retention of the original grain size or refinement, presence of a developed subgrain structure, low dislocation density within the body of grains, and absence of pore type defects, which gives a high impact strength compared with that obtained after deformation at higher temperatures.

  3. 3.

    With an increase in carbon content in low-carbon steels (up to 0.3% C) the superplasticity effect develops to a lesser degree, and there is a reduction in the difference in impact strength after deformation in a superplasticity regime and at higher temperatures.

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Literature cited

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  4. A. P. Surovtsev and V. E. Sukhanov, “The nature of the anomalous deformability of lowcarbon steels”, Metalloved. Term. Obrab. Met., No. 10, 15–20 (1984).

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Authors
  1. A. P. Surovtsev
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  2. V. E. Sukhanov
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  3. O. N. Baklanova
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Additional information

I. P. Bardin Central Scientific-Research Institute of Ferrous Metallurgy, Moscow Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 5–7, April, 1987.

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Surovtsev, A.P., Sukhanov, V.E. & Baklanova, O.N. Structure and properties of low-carbon steels and iron after deformation under superplasticity conditions. Met Sci Heat Treat 29, 247–251 (1987). https://doi.org/10.1007/BF00769420

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  • DOI: https://doi.org/10.1007/BF00769420

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