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The annealing phenomena and thermal stability of severely deformed steel sheet

Khodabakhshi, F ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2011.03.024
  3. Publisher: 2011
  4. Abstract:
  5. However, there are many works on annealing process of SPDed non-ferrous metals, there are limit works on annealing process of SPDed low carbon steel. Therefore, in this study the annealing responses after constrained groove pressing (CGP) of low carbon steel sheets have been investigated. The sheets are subjected to severe plastic deformation at room temperature by CGP method up to three passes. Nano-structured low carbon steel sheets produced by severe plastic deformation are annealed at temperature range of 100-600 °C for 20. min. The changes of their microstructures after deformation and annealing are studied by optical microscopy. The effects of large strain and annealing temperature on microstructure, strength and hardness evolutions of the nano-scale grained low carbon steel are examined. The results show that annealing phenomena can effectively improve the elongation of SPDed sheets with preserving the hardness and mechanical strength. Also, the thermal stability of microstructure and mechanical properties can be observed through annealing temperatures up to 400 °C and temperature of 400 °C is achieved as an optimum annealing temperature in which both strength and elongation are increased and hardness inhomogeneity of the sheet is minimum. Annealing at temperatures of higher than 400. °C leads to abnormal grain growth
  6. Keywords:
  7. Abnormal grain growth ; Annealing behavior ; Annealing process ; Annealing temperatures ; Constrained groove pressing ; Inhomogeneities ; Large strains ; Low carbon ; Mechanical strength ; Microstructure and mechanical properties ; Nano scale ; Nano-structured ; Room temperature ; Severe plastic deformations ; Temperature range ; Thermal stability ; Three-pass ; Aluminum sheet ; Annealing ; Grain growth ; Hardness ; Mechanical properties ; Microstructure ; Nanostructures ; Optical microscopy ; Plastic deformation ; Steel sheet ; Thermodynamic stability ; Low carbon steel
  8. Source: Materials Science and Engineering A ; Volume 528, Issue 15 , June , 2011 , Pages 5212-5218 ; 09215093 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0921509311002942