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EBSD Study on Proeutectoid Ferrite and Eutectoid Ferrite Refinement Mechanism of D2 Wheel Steel Under a Rolling Condition

Abstract

This study used scanning electron microscopy with an electron backscatter diffraction system to study the refinement mechanism of proeutectoid ferrite (Pro-F) and eutectoid ferrite (Eut-F) in a D2 wheel steel under rolling contact conditions. The results indicate that as the shear strain increased (γ < 0.21), the dislocation density in the proeutectoid ferrite increased continuously, and the formed dislocation cells were distributed uniformly in the grains. Subsequently, the dislocation cell boundaries were changed into low-angle boundaries (LABs); these LABs gradually became high-angle boundaries (HABs), and the average grain size was refined from 8 μm to 710 nm. Under a shear strain of 0.21 ≤ γ ≤ 0.84, dislocation pile-up occurred at the ferrite side of the eutectoid ferrite–cementite interface, and the spatial misorientation between the two adjacent eutectoid ferrites increased gradually. The ferrite lamellar was divided into bamboo-like grains by the LABs, and the proeutectoid ferrite was refined gradually into equiaxed grains. When the shear strain was at 0.84 < γ < 3.314, the number of HABs inside the eutectoid ferrite lamellar increased, and they were refined into bamboo-like grains. The two kinds of ferrite grains are refined repeatly by the equiaxial grains in an “elongation-bamboo like refinement-elongation” process, which gradually reduced the size difference. As the shear strain further increased, the two ferrites were completely mixed into the same morphology, the dislocation density was reduced dramatically, and ultra-fine equiaxed grains of approximately 110 nm were formed.

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Acknowledgements

The project was supported by the National Basic Research Program of China (973) (2015CB654802), and the China Academy of Railway Sciences Corporation Limited within the major issues of the fund (No. 2019YJ093).

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Correspondence to Ruiming Ren.

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Hua, J., Pan, J., Liu, P. et al. EBSD Study on Proeutectoid Ferrite and Eutectoid Ferrite Refinement Mechanism of D2 Wheel Steel Under a Rolling Condition. Tribol Lett 69, 148 (2021). https://doi.org/10.1007/s11249-021-01527-6

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Keywords

  • D2 wheel steel
  • EBSD
  • Proeutectoid ferrite
  • Eutectoid ferrite
  • Shear strain