Design of microalloyed steel hot rolling schedule by torsion testing: average schedule vs. real schedule
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ISIJ International, Vol. 50, p.1193-1199 (1003,Kb) (Accés restringit)
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10.2355/isijinternational.50.1193
Inclou dades d'ús des de 2022
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hdl:2117/11995
Tipus de documentArticle
Data publicació2010
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Abstract
The hot torsion simulator has been extensively used as a means to understand the microstructure evolution
of different steel grades during hot rolling. The test is suitable to simulate ‘real’ industrial schedules as
well as schedules designed to obtain information regarding the intrinsic properties of the materials. For example,
it is common to apply ‘average’ schedules, in which deformation per pass, interpass time, strain rate
and cooling rate are kept constant, to determine the characteristic temperatures Ar3, Ar1 and Tnr (start and
finish of the austenite transformation and no recrystallization temperatures) of steels. In this work, both a
‘real’ schedule simulating a rolling schedule in a reversing mill and an ‘average’ schedule were applied to a
series of Ti and Nb microalloyed steels. In general, the steels exhibited somewhat different behaviours for
the different thermomechanical schedules, e.g. the pancaking temperature region is easily detectable after
an ‘average’ schedule, while for the ‘real’ schedule some softening can be detected in the pancaking region,
which is strongly dependent on the strain and interpass time. Moreover, the paper analyzes a new approach
to stress-strain curves, which is used to better understand the sequence of events which take place during
rolling and their dependence on rolling parameters.
CitacióCalvo, J.; Collins, L.; Yue, S. Design of microalloyed steel hot rolling schedule by torsion testing: average schedule vs. real schedule. "ISIJ international", 2010, vol. 50, p. 1193-1199.
ISSN0915-1559
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ISIJ vol.50 n.8 (2010).pdf | ISIJ International, Vol. 50, p.1193-1199 | 1003,Kb | Accés restringit |