TY - JOUR

T1 - Modelling stress relaxation after hot deformation

T2 - Microstructure-property relationships in Nb-bearing steels

AU - Zhao, J.

AU - Yang, Q.

AU - Eskandari Sabzi, H.

AU - Wen, W.

AU - Rivera-Díaz-del-Castillo, P.E.J.

PY - 2022/4/1

Y1 - 2022/4/1

N2 - 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.

AB - 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.

KW - Additive manufacturing

KW - Multi-pass metal forming

KW - Recovery

KW - Recrystallization

KW - Stress relaxation

KW - 3D printers

KW - Additives

KW - Coarsening

KW - Deformation

KW - Growth kinetics

KW - Metal recovery

KW - Nucleation

KW - Recrystallization (metallurgy)

KW - Deformation microstructure

KW - Dislocation climb

KW - Dislocation recovery

KW - Interstitials

KW - Microstructure-property relationships

KW - Multi-pass

KW - Physical phenomena

KW - Recrystallisation

KW - Solute drag

U2 - 10.1016/j.ijplas.2022.103219

DO - 10.1016/j.ijplas.2022.103219

M3 - Journal article

VL - 151

JO - International Journal of Plasticity

JF - International Journal of Plasticity

SN - 0749-6419

M1 - 103219

ER -