Conclusions
1. The process of warm deformation of steel St3 by the method of equal-channel angular pressing (ECAP) with channels intersecting at an angle of 90° yields an ultrafinegrain structure with grains 0.25–0.45 µm in size.
2. The ultrafine-grain structure of low-carbon steel St3 increases the strength to σ0.2=700 − 850 MPa at a quite satisfactory ductility (δ=10 − 15%), which corresponds to the strength level of low-alloy high-strength steels.
3. The performance of ECAP under conditions close to pure shear makes it possible to obtain a quite uniform distribution of the microhardness over the cross section of the specimen.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 31 – 35, September, 2000.
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Dobatkin, S.V., Valiev, R.Z., Krasil’nikov, N.A. et al. Structure and properties of steel St3 after hot equal-channel angular pressing. Met Sci Heat Treat 42, 366–369 (2000). https://doi.org/10.1007/BF02725317
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DOI: https://doi.org/10.1007/BF02725317