Carbon profile analysis of Fe-Cr-C/Fe-Cr-Ni-C diffusion joints

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Authors	SOPOUŠEK Jiří MILLION Bořivoj
Year of publication	2003
Type	Article in Periodical
Magazine / Source	Kovové materiály
MU Faculty or unit	Faculty of Science
Citation
Field	Physical chemistry and theoretical chemistry
Keywords	weldment; steel; DICTRA; caxbon profile; simulation
Description	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 foregoing findings. Stable local equilibrium in the diffusion zone and the thermodynamic stability of dissimilar welded joints are discussed.
Related projects:	Kinetics of carbide precipitation in Cr-Mo steels