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#7022. EBSD Study on Proeutectoid Ferrite and Eutectoid Ferrite Refinement Mechanism of D2 Wheel Steel Under a Rolling Condition
| December 2026 | publication date |
| Proposal available till | 05-06-2025 |
| 4 total number of authors per manuscript | 0 $ |
| The title of the journal is available only for the authors who have already paid for |
| Journal’s subject area: |
| Mechanical Engineering; Mechanics of Materials; Surfaces, Coatings and Films; Surfaces and Interfaces; |
| place 1 | place 2 | place 3 | place 4 |
| Free | Free | Free | Free |
| 2350 $ | 1200 $ | 1050 $ | 900 $ |
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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 (? < 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 ?m to 710 nm. Under a shear strain of 0.21 ? ? ? 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 < ? < 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.
Keywords:
D2 wheel steel; EBSD; Eutectoid ferrite; Proeutectoid ferrite; Shear strain
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4 place - free (for sale)
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 (? < 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 ?m to 710 nm. Under a shear strain of 0.21 ? ? ? 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 < ? < 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.
Keywords:
D2 wheel steel; EBSD; Eutectoid ferrite; Proeutectoid ferrite; Shear strain
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