Abstract
An ultrafine-grained (UFG) structure of equiaxed and fiber types in the low-carbon structural steel 05G2MFBT (Fe–2Mn–Mo–V–Nb–Ti) has been formed with various techniques of deformation-heat treatment. This steel with a UFG structure has been found to exhibit higher strength properties. Different deformation techniques have been shown to produce either a fibrous or an equiaxed UFG structure with carbide particles of a wide range of sizes. The brittle fracture resistance of the fibrous UFG steel has been found to be higher than that of the fine-grained steel after controlled rolling and subsequent accelerated cooling. Standard bending-impact tests have shown that the steel with a fibrous UFG structure is characterized by higher impact strength characteristics and a lower ductile–brittle transition temperature.
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ACKNOWLEDGMENTS
The scientific research was carried out at the Structural and Physical-Mechanical Studies of Materials Center of the Collaborative Use of the Institute for Problems of Metal Superplasticity of the Russian Academy of Sciences.
Funding
This work was performed within the state assignment of Institute for Problems of Metal Superplasticity of the Russian Academy of Sciences and Institute of Engineering Science, Ural Branch of the RAS for 2019–2021.
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Translated by T. Gapontseva
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Sergeev, S.N., Safarov, I.M., Zhilyaev, A.P. et al. Effect of Deformation-Thermal Processing on the Microstructure and Mechanical Properties of Low-Carbon Structural Steel. Phys. Metals Metallogr. 122, 621–627 (2021). https://doi.org/10.1134/S0031918X21060090
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DOI: https://doi.org/10.1134/S0031918X21060090