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Bimodal grain size and mechanical properties enhancement in low carbon steel by ultra-rapid annealing

Mostafaei, M. A ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jmrt.2022.03.112
  3. Publisher: Elsevier Editora Ltda , 2022
  4. Abstract:
  5. Different heating rates of 200-1200 deg;C/s were utilized during ultra-rapid annealing (URA) up to the temperatures of 730 and 760 °C on the severely deformed low carbon steel. Higher hardness, strength and ductility achieved for the sample heated at 730 °C with 600 °C/s due to formation of bimodal grain size (BGS) microstructure than them for non-BGS samples. The BGS enhancement for the hardness, strength and ductility with respect to those of as received sample was 67%, 80% and 7%, respectively, and, with respect to those of severely deformed one was 16%, 44% and 24%, respectively. URA with the heating rate of 200 °C/s and 1000 °C/s leads to fully recrystallized and non-recrystallized microstructures, respectively. Also, BGS microstructure in heating rate of 1200 °C/s can be formed if the peak temperature of URA is increased proportionally to the increased heating rate. © 2022 The Author(s)
  6. Keywords:
  7. Mechanical properties ; Microstructure ; Annealing ; Ductility ; Grain size and shape ; Hardness ; Heating ; Low carbon steel ; Recrystallization (metallurgy) ; Bimodal grain size ; Bimodal grains ; Grainsize ; High hardness ; Low-carbon steels ; Mechanical properties enhancements ; Peak temperatures ; Recrystallized microstructures ; Strength and ductilities ; Ultra-rapid annealing ; Heating rate
  8. Source: Journal of Materials Research and Technology ; Volume 18 , 2022 , Pages 2363-2367 ; 22387854 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S2238785422004197