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Abstract
Physical models for the development of microstructure have the potential of revealing new phenomena and properties. They can also help identify the controlling variables. The ability to estimate quantitatively the weld metal microstructure relies on a thorough understanding of the phase transformation theory governing the changes that occur as the weld solidifies and cools to ambient temperature. Considerable progress has been made with the help of thermodynamic and kinetic theory, which accounts for the variety of alloying additions, non-equilibrium cooling conditions, and other variables necessary to specify fully the welded component. These aspects are illustrated with the aim of presenting a brief account of the methodology and of those problems which have yet to be solved.
MST/1499