The hot ductility of a C-Mn-Nb-AI steel, as measured by reduction of area in a tensile test, has been obtained after a variety of different cooling patterns to the test temperature. Samples were first solution treated at 1330°C and then cooled to test temperatures in the range 800 to 1100°C. One cooling pattern involved cooling at constant rate of 60°C min-1 to the test temperature whilst the others involved temperature oscillations of constant amplitude. It was found that introducing cyclic temperature oscillations widened and deepened the ductility trough and this was further aggravated by increasing the amplitude of the oscillations. Replica examinations indicated enhanced NbCN precipitation during the temperature oscillations. It is concluded that temperature oscillations should be kept as small as possible during continuous casting to obtain optimum hot ductility.
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Mintz et al. (1987) studied this question.
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