Abstract
Microstructure and properties of Inconel 625 coatings deposited by the Cold Metal Transfer technique on a 16Mo3 boiler tube were investigated. The clad layers were shown to have a typical cellular-dendritic structure with secondary phases in the interdendritic regions (e.g. Laves phases and complex nitrides/carbides (MX)). Nanohardness of the interdendritic regions was higher than of the ɣ matrix dendritic regions. Energy dispersive X-ray spectroscopy analysis revealed microsegregation of Ni, Cr, Fe to the dendritic regions, as well as interdendritic segregation of Nb and Mo. Based on the phase identifications performed, a new solidification path is proposed.
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