Conclusions
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1.
The development of brittleness in 20GMR steel at cooling rates of 20–30°/min is due to the greatly deformed structure of low-carbon martensite, in which dislocations are strongly pinned by carbon atoms.
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2.
The following mechanical properties can be obtained in parts of 20GMR steel 5–70 mm thick as the result of deformation at 800–700°C during uninterrupted cooling: σb = 145-120 kg/mm2, σ0.2 = 100-80 kg/mm2; δ=10–15%.
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3.
TMT of bainitic steels can be conducted during cooling in air without any additional heat treatment.
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Additional information
Institute of Metallurgy of the Academyof Sciences of the GruzSSR. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 22–26, May, 1967.
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Zoidze, N.A., Habraken, L., Economopulos, M. et al. Thermomechanical treatment of 20GMR steel during uninterrupted cooling. Met Sci Heat Treat 9, 351–354 (1967). https://doi.org/10.1007/BF00655025
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DOI: https://doi.org/10.1007/BF00655025