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Tailoring dynamic recrystallization in Ni- and Fe-base high temperature alloys

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Published
Publication date2013
Host publicationRecrystallization and Grain Growth V
Pages427-430
Number of pages4
Volume753
<mark>Original language</mark>English
Event5th International Conference on Recrystallization and Grain Growth, ReX and GG 2013 - Sydney, NSW, Australia
Duration: 5/05/201310/05/2013

Conference

Conference5th International Conference on Recrystallization and Grain Growth, ReX and GG 2013
Country/TerritoryAustralia
CitySydney, NSW
Period5/05/1310/05/13

Publication series

NameMaterials Science Forum
Volume753
ISSN (Print)0255-5476

Conference

Conference5th International Conference on Recrystallization and Grain Growth, ReX and GG 2013
Country/TerritoryAustralia
CitySydney, NSW
Period5/05/1310/05/13

Abstract

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.