Abstract
Delta ferrite undergoes some rather complex solid-state transformations during solidification and cooling. These have been investigated in a series of alloyed high carbon steels. Solidification paths have been determined using the quenching during differential thermal analysis method (ODTA). The different phases produced were identified by scanning and transmission electron microscopy and were analysed by electron probe microanalysis. Four different types of transformation were identified: solid state precipitation, cellular precipitation, delta eutectoid transformation and plate formation followed by two further precipitation reactions. The latter transformation results in the development of very hard and complex structures in which four phases are intimately associated. An explanation has been proposed for the mechanism of their formation.
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