Abstract—The influence of the processes of self-tempering and tempering on the mechanical characteristics and structure of low-carbon martensitic steel after air-quenching has been considered in this work. The processes of martensite decomposition (self-tempering) that started upon cooling continue in the steel in the course of subsequent tempering at 200, 300, 400, and 500°C with the formation of a ferrite–carbide mixture of different degrees of dispersion. Upon tempering at temperatures of 200–400°C, a monotonic increase is noted in the yield stress by 11%; the tempering at 500°C leads to a 3% reduction in the yield stress. The character of the fracture of the samples was studied using scanning electron microscopy; this study has confirmed the phenomenon of temper brittleness in the steel at temperatures of 300 and 500°C, which is in good agreement with the results of mechanical tests.
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The work was supported by a grant of the President of the Russian Federation for state support of young Russian scientists no. MK-6069.2018.8.
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Translated by S. Gorin
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Vorobev, R.A., Dubinskii, V.N. & Evstifeeva, V.V. Effect of The Processes of Self-Tempering and Tempering on The Mechanical Characteristics and the Character of Fracture of Low-Carbon Martenstic Steel Quenched in Air. Phys. Metals Metallogr. 120, 989–994 (2019). https://doi.org/10.1134/S0031918X19100132
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DOI: https://doi.org/10.1134/S0031918X19100132