Abstract
The addition of microalloying elements to a low carbon steel, followed by a thermomechanical treatment, gives rise to a high strength tough material which is also weldable. To predict a priori the microstructure after a welding thermal cycle, a numerical model of the grain growth process has been developed following that proposed by Aashby and Easterling. For the high strength low alloy steel studied, certain unknown kinetic constants must be determined by experiments using a welding simulator. The microstructural diagram obtained has been compared with the structures of real welds. The correlation was quite good except of the grain sizes closest to the fusion zone, but this can be explained by nonequiaxial growth of grains. Scanning electron microscopy together with energy dispersive spectroscopy analysis has been used to characterize the microstructure and in particular to study the morphology of nonmetallic includions, to determine the presence of shape controlling elements.
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