TY - JOUR

T1 - Features of Isothermal Bainite Formation in Steel 20Kh2G2SNMA

AU - Maisuradze, M.

AU - Kuklina, A.

AU - Ryzhkov, M.

AU - Lebedev, D.

AU - Nazarova, V.

AU - Okishev, K.

N1 - The study was funded by the Russian Science Foundation Grant No. 22–29–00106.

PY - 2023

Y1 - 2023

N2 - A dilatometric study of the bainite transformation in 20Kh2G2SNMA steel during isothermal holding in the temperature range of 280–380°C was carried out. The kinetics of the bainite transformation is determined, and the values of the coefficients k and n of the Austin–Rickett equation are established. The fraction of retained austenite in the steel structure following isothermal hardening was estimated using X-ray diffraction analysis. It is shown that, at 320°C and higher, the carbon content in retained austenite is in satisfactory agreement with the theoretically predicted values, and below 320°C, there is a discrepancy associated with slower bainite transformation and carbon partitioning. A correlation has been established between the impact strength, the fraction of bainite and retained austenite, and the carbon content in the latter. It is shown that with an increase in the fraction of bainite during isothermal holding, the fraction of retained austenite in steel increases, and the carbon content in it decreases, which adversely affects the impact strength of steel. © 2023, Springer Science+Business Media, LLC, part of Springer Nature.

AB - A dilatometric study of the bainite transformation in 20Kh2G2SNMA steel during isothermal holding in the temperature range of 280–380°C was carried out. The kinetics of the bainite transformation is determined, and the values of the coefficients k and n of the Austin–Rickett equation are established. The fraction of retained austenite in the steel structure following isothermal hardening was estimated using X-ray diffraction analysis. It is shown that, at 320°C and higher, the carbon content in retained austenite is in satisfactory agreement with the theoretically predicted values, and below 320°C, there is a discrepancy associated with slower bainite transformation and carbon partitioning. A correlation has been established between the impact strength, the fraction of bainite and retained austenite, and the carbon content in the latter. It is shown that with an increase in the fraction of bainite during isothermal holding, the fraction of retained austenite in steel increases, and the carbon content in it decreases, which adversely affects the impact strength of steel. © 2023, Springer Science+Business Media, LLC, part of Springer Nature.

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U2 - 10.1007/s11015-023-01581-6

DO - 10.1007/s11015-023-01581-6

M3 - Article

VL - 67

SP - 915

EP - 927

JO - Metallurgist

JF - Metallurgist

SN - 0026-0894

IS - 7-8

ER -