Abstract
The precipitation behavior of supersaturated ferrite ([alpha][sup ss]) in steels, is a manifestation of a number of synergistic factors, like the (a) initial concentration of solutes, (b) affinity of different solutes to carbon, (c) efficiency of various carbides in scavenging the matrix of its solutes and (d) the consequent changes in the local equilibrium. Therefore, it was found essential to identify a single parameter, in terms of which the evolution of carbides in steels can be understood. A concept of Phase Evolution Diagram (PED) has been proposed, for the above purpose and its predictive abilities demonstrated in wrought 9Cr-1Mo steel. While developing the concept of PED, the alloy was considered as a homogeneous system, which is not true in the case of a weldment. The present paper explains the validity of this concept for its extension to weldments of 9Cr-1Mo steel and discusses these diagrams generated for the same.
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