Modelling stress relaxation after hot deformation: microstructure-property relationships in Nb-bearing steels
Modelling stress relaxation after hot deformation: microstructure-property relationships in Nb-bearing steels
Stress relaxation taking place after hot deformation is modelled by incorporating the simultaneous action of various physical phenomena. Dislocation recovery, recrystallization, and precipitation are all interrelated adopting new formulations. Dislocation recovery is approached through a vacancy-mediated dislocation climb approach. Recrystallization is considered to be meta-dynamic or static, and the effects of precipitate pinning and (interstitial and substitutional) solute drag are incorporated. The kinetics of precipitation nucleation, growth, and coarsening are also taken into account; precipitate nucleation in dislocation cells is assumed and thus the dislocation cell evolution is accounted for. The softening behaviour is thus tracked for 6 microalloyed steel grades and compared with 37 softening curves for a range of temperatures and prior deformation rates; the modelling describes the experiments with great accuracy. The application of the approach to additive manufacturing microstructural relaxation is discussed.
Additive manufacturing, Multi-pass metal forming, Recovery, Recrystallization, Stress relaxation
Zhao, Jianwei
81e1c93c-7ba8-41a2-908a-70ce6cdba601
Yang, Quan
a18c6334-fae8-42c5-bb2d-48ec2e080174
Eskandari Sabzi, Hossein
767d5a23-489d-455f-80d0-bad990b42783
Wen, Wei
4bca5193-31fc-4e56-95fc-c0ffde65c0d3
Rivera-Díaz-del-Castillo, Pedro E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
18 January 2022
Zhao, Jianwei
81e1c93c-7ba8-41a2-908a-70ce6cdba601
Yang, Quan
a18c6334-fae8-42c5-bb2d-48ec2e080174
Eskandari Sabzi, Hossein
767d5a23-489d-455f-80d0-bad990b42783
Wen, Wei
4bca5193-31fc-4e56-95fc-c0ffde65c0d3
Rivera-Díaz-del-Castillo, Pedro E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
Zhao, Jianwei, Yang, Quan, Eskandari Sabzi, Hossein, Wen, Wei and Rivera-Díaz-del-Castillo, Pedro E.J.
(2022)
Modelling stress relaxation after hot deformation: microstructure-property relationships in Nb-bearing steels.
International Journal of Plasticity, 151, [103219].
(doi:10.1016/j.ijplas.2022.103219).
Abstract
Stress relaxation taking place after hot deformation is modelled by incorporating the simultaneous action of various physical phenomena. Dislocation recovery, recrystallization, and precipitation are all interrelated adopting new formulations. Dislocation recovery is approached through a vacancy-mediated dislocation climb approach. Recrystallization is considered to be meta-dynamic or static, and the effects of precipitate pinning and (interstitial and substitutional) solute drag are incorporated. The kinetics of precipitation nucleation, growth, and coarsening are also taken into account; precipitate nucleation in dislocation cells is assumed and thus the dislocation cell evolution is accounted for. The softening behaviour is thus tracked for 6 microalloyed steel grades and compared with 37 softening curves for a range of temperatures and prior deformation rates; the modelling describes the experiments with great accuracy. The application of the approach to additive manufacturing microstructural relaxation is discussed.
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e-pub ahead of print date: 13 January 2022
Published date: 18 January 2022
Keywords:
Additive manufacturing, Multi-pass metal forming, Recovery, Recrystallization, Stress relaxation
Identifiers
Local EPrints ID: 492227
URI: http://eprints.soton.ac.uk/id/eprint/492227
ISSN: 0749-6419
PURE UUID: fb42aa43-f3d1-4318-ac9f-b9f2ab111761
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Date deposited: 22 Jul 2024 16:58
Last modified: 23 Jul 2024 02:08
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Contributors
Author:
Jianwei Zhao
Author:
Quan Yang
Author:
Hossein Eskandari Sabzi
Author:
Wei Wen
Author:
Pedro E.J. Rivera-Díaz-del-Castillo
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