A three-dimensional finite element model for analysis of metal flow,
thermal and microstructural evolutions during hot bar rolling is presented.
The heat transfer coefficients at the bar surface are allowed to vary as it is
assumed that the bar is either in the air or in contact with the rolls. The
microstructural model includes the possibility of both dynamic and static
recrystallizations and grain growth during interpass time. Hot rolling process
of a square bar in square-diamond-square-square pass sequence is analyzed.
Data of temperature, strain and strain-rate distributions are used to compute
the microstructural evolution in each pass. The predictions of the model are
validated by comparing the calculated results with experimental data
available in the literature