Combined Effects of Grain Boundary Convection and Migration in Dynamic Phase Transformations

Frank Montheillet; David Piot

doi:10.4028/www.scientific.net/MSF.879.72

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HomeMaterials Science ForumMaterials Science Forum Vol. 879Combined Effects of Grain Boundary Convection and...

Combined Effects of Grain Boundary Convection and Migration in Dynamic Phase Transformations

Abstract:

During large strain deformation of polycrystals, grain or interphase boundaries are driven by the material flow, which is a convection movement. By contrast, upon static recrystallization or grain growth, their motion takes place with respect to matter, which is referred to as grain boundary or interphase migration. During hot working, where dynamic phase transformations commonly occur, convection and migration operate simultaneously. According to local geometrical (e.g., prescribed velocity field, grain boundary curvature) and physical (e.g., grain boundary mobility, dislocation densities) conditions, they can reinforce or oppose each other, but generally combine in more complex ways. The aim of this work is to analyze such effects on the basis of simple analytical approaches. The results suggest that second phase particles or grains dynamically generated (i.e., during straining) exhibit approximately equiaxed shapes.

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Periodical:

Materials Science Forum (Volume 879)

Pages:

72-77

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.72

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Online since:

November 2016

Authors:

Frank Montheillet, David Piot

Keywords:

Grain Boundary, Migration, Modeling, Precipitation, Recrystallization

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References

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