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Dynamic Strain - Induced Boundary Migration during Dynamic Recovery at a High Temperature Deformation with a Lower Strain Rate

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Abstract:

Conventional hot compression deformation and water quenching experiments were applied to investigate the evolution of austenite grain structures before the initiation of dynamic recrystallization. The experimental results reveal an interesting phenomenon that dynamic strain induced boundary migration can lower dislocation density and coarsen austenite grains. The results show that dynamic recovery is not the only way to decrease dislocation density, the mechanism of which for dynamic recovery is related to dislocations climb and annihilation, resulting in the formation of sub-grains and regular sub-boundaries. However, the mechanism of decreasing dislocation density for dynamic strain induced boundary migration is different from dynamic recovery. Therefore, dynamic strain induced boundary migration should be another softening mechanism before the initiation of dynamic recrystallization.

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Periodical:

Advanced Materials Research (Volumes 887-888)

Pages:

395-399

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.887-888.395

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Online since:

February 2014

Authors:

Feng Qin Ji*

Keywords:

Austenite Grains, Dynamicstrain – Induced Boundary Migration, High Temperature Deformation, Metals and Alloys, Recrystallization

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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