Structural Aspect of Isothermal Bainitic Transformation in High-Carbon Manganese–Silicon Steel

Abstract

Transmission and scanning electron microscopy and X-ray diffraction analysis were used to compare the structural states of high-carbon manganese–silicon steel which underwent low-temperature isothermal bainitic and martensitic transformations. It was shown that bainite consisting of thin α-phase plates and residual austenite interlayers forms during isothermal holding at 300°С. As the isothermal holding time increases, fine carbide particles precipitate within the bainite α-phase.

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ACKNOWLEDGMENTS

This work, namely, the problem definition and electron-microscopic studies were supported by the Russian Foundation for Basic Research (project no. 16-19-10252). X-ray diffraction analysis was performed in terms of state assignment of FASO of the Russian Federation (theme STRUKTURA, no. АААА-А18-118020190116-6.)

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Correspondence to N. A. Tereshchenko.

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Translated by N. Kolchugina

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Yakovleva, I.L., Tereshchenko, N.A., Mirzaev, D.A. et al. Structural Aspect of Isothermal Bainitic Transformation in High-Carbon Manganese–Silicon Steel. Phys. Metals Metallogr. 119, 956–961 (2018). https://doi.org/10.1134/S0031918X18100149

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Keywords:

  • high-carbon manganese–silicon steel
  • low-temperature bainitic transformation
  • structure
  • martensite
  • bainite
  • residual austenite
  • fine carbide particles