Startseite Constitutive modelling of mill loads during hot rolling of AISI 321 austenitic stainless steel
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Constitutive modelling of mill loads during hot rolling of AISI 321 austenitic stainless steel

  • Richard K. C. Nkhoma , Charles W. Siyasiya und Waldo E. Stumpf
Veröffentlicht/Copyright: 15. September 2014
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 105 Heft 9

Abstract

A modelled constitutive equation derived from hot working tests to predict hot rolling mill loads is proposed and validated against industrial hot rolling data for AISI 321 stainless steel. Good correlation is found between the predicted mean flow stress, the Zener–Hollomon Z parameter and actual industrial mill load values from mill logs if allowances are made for differences in von Mises plane strain conversion, friction and front or back end tension. The multipass hot working behaviour of this steel was simulated through Gleeble thermomechanical compression testing with the deformation temperature varying between 1200°C down to 800°C and the strain rate between 0.001 s−1 and 5 s−1. At strain rates greater than 0.05 s−1, dynamic recovery as a softening mechanism was dominant, increasing the dynamic recrystallisation to dynamic recovery transition temperature to higher temperatures. This implies that through extrapolation to typical industrial strain rates of about 60 s−1, most likely no dynamic recrystallisation in plant hot rolling occurs in this steel but only dynamic recovery. Grain refinement by dynamic recrystallisation is, therefore, unlikely in this steel under plant hot rolling conditions. Finally, mill load modelling using the hot working constitutive constants of the near-equivalent AISI 304 instead of those specifically determined for AISI 321, introduces measurable differences in the predicted mill loads. The use of alloy-specific hot working constants even for near-equivalent steels is, therefore, recommended.

Keywords: Dynamic recrystallisation (DRX); Dynamic recovery (DRV); Constitutive equation; Mean flow stress (MFS); Dynamic recrystallisation to dynamic recovery transition temperature (DRTT)
* Correspondence address, Dr. Richard Nkhoma, University of Pretoria, Department of Materials Science and Metallurgical Engineering, 0002 Pretoria, South Africa, Mobile: +27(0)837370072, Fax: +27(0)865022575, E-mail:

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Received: 2014-02-15
Accepted: 2014-04-03
Published Online: 2014-09-15
Published in Print: 2014-09-15

© 2014, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Diffusivities and atomic mobilities of an Sn–Ag–Bi–Cu–Pb melt
  5. Experimental study of the phase relations in the Fe–Cr–Si ternary system at 700°C
  6. Effect of molybdenum on the microstructure, mechanical properties and corrosion behavior of Ti alloys
  7. Mechanism of grain refinement and coarsening in undercooled Ni–Fe alloy
  8. Effects of copper content and liquid separation on the microstructure formation of Co–Cu immiscible alloys
  9. Influence of the solidification temperature range on Gasar structures made from Cu–Mn alloys
  10. Effect of ageing time on mechanical properties and tribological behaviour of aluminium hybrid composite
  11. Microstructure and tensile properties of a friction stir welded Al–Mg–Si alloy
  12. Lüders effect in Al 99.7% extruded via the KoBo method
  13. Reduced graphene oxide nanocomposites with different diameters and crystallinity of TiO2 nanoparticles – synthesis, characterization and photocatalytic activity
  14. Constitutive modelling of mill loads during hot rolling of AISI 321 austenitic stainless steel
  15. X-ray stress measurement with two-dimensional detector based on Fourier analysis
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  19. DGM News
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https://doi.org/10.3139/146.111093
Schlagwörter für diesen Artikel
Dynamic recrystallisation (DRX); Dynamic recovery (DRV); Constitutive equation; Mean flow stress (MFS); Dynamic recrystallisation to dynamic recovery transition temperature (DRTT)

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Diffusivities and atomic mobilities of an Sn–Ag–Bi–Cu–Pb melt
  5. Experimental study of the phase relations in the Fe–Cr–Si ternary system at 700°C
  6. Effect of molybdenum on the microstructure, mechanical properties and corrosion behavior of Ti alloys
  7. Mechanism of grain refinement and coarsening in undercooled Ni–Fe alloy
  8. Effects of copper content and liquid separation on the microstructure formation of Co–Cu immiscible alloys
  9. Influence of the solidification temperature range on Gasar structures made from Cu–Mn alloys
  10. Effect of ageing time on mechanical properties and tribological behaviour of aluminium hybrid composite
  11. Microstructure and tensile properties of a friction stir welded Al–Mg–Si alloy
  12. Lüders effect in Al 99.7% extruded via the KoBo method
  13. Reduced graphene oxide nanocomposites with different diameters and crystallinity of TiO2 nanoparticles – synthesis, characterization and photocatalytic activity
  14. Constitutive modelling of mill loads during hot rolling of AISI 321 austenitic stainless steel
  15. X-ray stress measurement with two-dimensional detector based on Fourier analysis
  16. People
  17. People
  18. People
  19. DGM News
  20. Personal
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