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Open AccessArticle

Mechanisms of Grain Structure Evolution in a Quenched Medium Carbon Steel during Warm Deformation

Laboratory of Bulk Nanostructured Materials, Belgorod State University, 85 Pobeda Str., 803015 Belgorod, Russia
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Crystals 2020, 10(7), 554; https://doi.org/10.3390/cryst10070554
Received: 13 June 2020 / Revised: 25 June 2020 / Accepted: 26 June 2020 / Published: 29 June 2020
(This article belongs to the Special Issue Crystal Plasticity)
The as-quenched medium-carbon low-alloy Fe-0.36wt.%C-1wt.%Cr steel was subjected to warm deformation via uniaxial compression at temperatures of 400–700 °C and strain rates of 10−4–10−2 s−1. At low temperatures (400–550 °C), the microstructure evolution was mainly associated with dynamic recovery with the value of activation energy of 140 ± 35 kJ/mol. At higher temperatures (600–700 °C), dynamic recrystallization was developed, and activation energy in this case was 243 ± 15 kJ/mol. The presence of nanoscale carbide particles in the structure at temperatures of 400–600 °C resulted in the appearance of threshold stresses. A two-component <001>//compression direction (CD) and <111>//CD deformation texture was formed during deformation. Deformation at the low temperatures resulted in the formation of elongated ferritic grains separated mainly by high-angle boundaries (HAB) with a strong <001>//CD texture. The grains with the <111>//CD orientation were wider in comparison with those with the <001>//CD orientation. The development of substructure in the form of low-angle boundaries (LAB) networks was also observed in the <111>//CD grains. The development of dynamic recrystallization restricted the texture formation. The processing map for warm deformation of the 0.36C-1Cr steel was constructed. View Full-Text
Keywords: deformation behavior; warm deformation; texture; microstructure; dynamic recrystallization; processing map deformation behavior; warm deformation; texture; microstructure; dynamic recrystallization; processing map
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Panov, D.; Dedyulina, O.; Shaysultanov, D.; Stepanov, N.; Zherebtsov, S.; Salishchev, G. Mechanisms of Grain Structure Evolution in a Quenched Medium Carbon Steel during Warm Deformation. Crystals 2020, 10, 554.

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