Conclusions
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1.
Subcritical superplasticity is observed in iron and low-alloy steel 17G1S at temperatures preceding the transformation (below the critical point). In the range of γ⇌α transformations the plasticity decreases sharply.
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2.
No sharp changes in plasticity are observed with the γ→ε→α transformation in triphase manganese steels (α+ε+γ).
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3.
The change in the plasticity of biphase (ε+γ) steel G17 is larger in the direct γ→ε transformation than in the reverse ε→γ transformation.
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4.
The temperature range of high plasticity in steels G14 and G17 can be utilized in selecting conditions for hot plastic deformation: 160–180° for steel G17 and 240° for steel G14.
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Literature cited
O. G. Sokolov, K. B. Katsov, and G. V. Karpenko, Superplasticity and Corrosion-Mechanical Strength of Biphase Iron-Manganese Alloys [in Russian], Naukova Dumka, Kiev (1977).
L. Nishiyama, Sci. Rep. Tohoku Univ.,23, 637 (1934).
Additional information
I. P. Bardin Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 24–27, March, 1981.
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Volynova, T.F., Gulyaev, A.P. Anomalies of plasticity and polymorphic transformations. Met Sci Heat Treat 23, 178–181 (1981). https://doi.org/10.1007/BF00769610
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DOI: https://doi.org/10.1007/BF00769610