Abstract
Former experimental observations of Fe-Cr-C/Fe-Cr-Ni-C weldments are compared in this paper with simulated results. The simulation method is based on the CALPHAD approach completed with theory of multi-component bulk diffusion, the local condition of phase equilibria, and assumption that diffusion is the process that controls the rate of phase transformation. The occurred overall carbon concentration peaks near the welded interface are explained by carbide reactions. Both phase and concentration simulated profiles correspond closely to the previous findings. Stable local equilibrium in the diffusion zone and the thermodynamic stability of dissimilar welded joints are discussed.

Key words
weldment, steel, DICTRA, carbon profile, simulation

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