Conclusions
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1.
To increase the strength of biphase steels of the G20 type we recommend austenitizing and plastic deformation near Ms with 15–20% reduction, which increases the yield strength by 150% and the ultimate strength by 50%.
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2.
The sharp increase in the strength of steel G20 with deformation in the γ»ε transformation range is due to the deformation process itself, which is associated with the formation of large numbers of stacking faults in austenite and in the hexagonal phase during deformation.
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3.
Deformation of steel G20 at the time of the γ»ε transformation in the superplastic condition reduces the resistance to deformation and induces relaxation of microstresses, retaining the ductility of the steel at a relatively high level.
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Literature cited
G. E. Zvigintseva et al., "Effect of carbon and silicon on hardening of Fe−Mn alloy G20", Fiz. Metal. Metalloved.,30, 1182 (1970).
I. N. Bogachev and V. F. Egolaev, Structure and Properties of Fe−Mn Alloys [in Russian], Metallurgiya, Moscow (1973), p. 96.
Additional information
Ural Polytechnical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 16–18, November, 1974.
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Bogachev, I.N., Zvigintseva, G.E., Logunov, V.Y. et al. Strengthening of steel G20 by deformation with the γ⇆ε transformation. Met Sci Heat Treat 16, 920–922 (1974). https://doi.org/10.1007/BF00663795
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DOI: https://doi.org/10.1007/BF00663795