이병주 교수 연구실 (16.03)

admin | 2016.07.11 15:59 | 조회 131






Abstract

A computational and experimental study has been carried out to produce highly value-added {100}
textured steel sheets. This study is based on an idea that an anisotropic surface segregation tendency of
impurity atoms would cause an inversion of relative surface energy between {110} and {100} surfaces in
bcc Fe and may induce the formation of {100} texture in steel sheets during grain coarsening. A phase
field model that can consider surface segregation of impurity atoms (and resultant decrease of surface
energy) and grain growth simultaneously is newly developed. The phase field model and surface
property data obtained from an atomistic approach are used to simulate grain coarsening behavior of
phosphorus-containing iron and to find an optimum process condition that can induce the {100} texture
in steel sheets. The phase field simulation indicates that the surface segregation and resultant change in
the relative difference in surface energy should be accomplished before the start of grain coarsening for
an effective formation of the {100} texture. A strong {100} texture is indeed generated experimentally in
phosphorus-containing bcc Fe-3.5wt% Si steel sheets through a two-step annealing process, one at a
relatively low temperature where only surface segregation can occur but not the grain coarsening and
the other at a relatively high temperature where the grain coarsening can also occur.


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{100} texture evolution in bcc Fe sheets - Computational design and experiments

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