Abstract
Hot steel ductility in continuous casting processes is determined by tensile test of notched cylindrical specimens which are obtained by melting and solidification and then tested after rate-controlled cooling with a new specific device available for any standard test machine. Hot ductility is proposed to be related to ultimate area reduction in the notched zone of the specimens. Experiments in the range of 700–1000°C are achieved on two types of niobium-vanadium microalloyed steels which only differ by their vanadium content. Ultimate area reductions are determinate by using in situ solidified specimens and reheated ones from room temperature, 10 −3 and 0.5 s −1 mean strain rate being considered. The change of ultimate area reductions mainly depends on austenitic grain size, segregation's distribution, dynamic precipitation of niobium-vanadium carbonitrides and so far the recrystallization occurrence of austenite.
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