Abstract
An investigation has been carried out to identify the precipitates in multiple microalloyed steels. The microalloying elements and interstitials included aluminium, niobium, titanium, vanadium, carbon, and nitrogen. It was found that the precipitates are complex in nature and they were rationalised on the basis of mutual solubility probably enhanced by non-stoichiometry. The precipitate morphologies were interpreted mainly in terms of steel compositions. Steels quenched from 1250°C contained titanium rich precipitates accompanied by the evolution of new niobium rich precipitates after hot rolling and quenching. A parameter K1 indicative of solute participation in the precipitation phenomenon was established and showed excellent correlation between steel and precipitate analyses. A sequence of precipitation in multiple microalloyed steels was achieved using solubility relationships as a premise.
MST/803
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