Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
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TY - GEN
T1 - Tailoring dynamic recrystallization in Ni- and Fe-base high temperature alloys
AU - Rivera-Diaz-del-Castillo, Pedro
AU - Galindo-Nava, Enrique
PY - 2013
Y1 - 2013
N2 - Theory for describing the conditions leading to dynamic recrystallization in FCC metals is introduced. The approach also describes stress-strain curves when this process occurs, and is unique in incorporating the effects of strain rate and temperature employing only physical parameters as input. The novelty of the approach stems from incorporating an incubation period in the equations describing the progress of dislocation density with strain; beyond such incubation dislocation free grains form. The energy barrier to ignite grain growth is expressed as a function of the strain energy stored in the material and a statistical entropy contribution due to the degrees of freedom available to a dislocation for annihilation. The incubation strain is obtained by performing an energy balance between the stored energy on the subgrain boundaries, the slip energy for boundary migration and the interfacial energy required for grain nucleation. The application of this work to Fe and Ni multicomponent alloys has lead to transition maps in temperature-strain rate space indicating the conditions for dynamic recrystallization occurrence.
AB - Theory for describing the conditions leading to dynamic recrystallization in FCC metals is introduced. The approach also describes stress-strain curves when this process occurs, and is unique in incorporating the effects of strain rate and temperature employing only physical parameters as input. The novelty of the approach stems from incorporating an incubation period in the equations describing the progress of dislocation density with strain; beyond such incubation dislocation free grains form. The energy barrier to ignite grain growth is expressed as a function of the strain energy stored in the material and a statistical entropy contribution due to the degrees of freedom available to a dislocation for annihilation. The incubation strain is obtained by performing an energy balance between the stored energy on the subgrain boundaries, the slip energy for boundary migration and the interfacial energy required for grain nucleation. The application of this work to Fe and Ni multicomponent alloys has lead to transition maps in temperature-strain rate space indicating the conditions for dynamic recrystallization occurrence.
KW - Dislocation theory
KW - Dynamic recrystallization
KW - Hot deformation
KW - Plasticity
KW - Statistical thermodynamics
U2 - 10.4028/www.scientific.net/MSF.753.427
DO - 10.4028/www.scientific.net/MSF.753.427
M3 - Conference contribution/Paper
AN - SCOPUS:84876547378
SN - 9783037856888
VL - 753
T3 - Materials Science Forum
SP - 427
EP - 430
BT - Recrystallization and Grain Growth V
T2 - 5th International Conference on Recrystallization and Grain Growth, ReX and GG 2013
Y2 - 5 May 2013 through 10 May 2013
ER -