Consolidation mechanism, microstructural evolution and corrosion resistance of Inconel 625 coatings

The inter-relationships between geometrical properties, microstructural characteristics and corrosion resistance on one hand and laser-material interaction parameter (alpha) on the other hand are examined. A laser-material interaction parameter within the range of 599 <= alpha <= 400 J.s g(-1) mm(-1) imparted optimum characteristics of microstructure, microhardness and corrosion resistance. The consolidation mechanism of the coatings indicates that this parameter ensures the formation of a double 'burn-in' macrostructure into the substrate which imparts non-porous, crack-free and a fine interfacial microstructure. This study provides guidance in designing Inconel 625 coatings of desirable microstructures and corrosion resistance.

Automated summary

The study explores the inter-relationships between geometrical properties, microstructural characteristics, and corrosion resistance with the laser-material interaction parameter. It is found that a specific laser-material interaction parameter within a certain range can impart coatings with optimal microstructure, microhardness, and corrosion resistance. This research offers guidance in designing Inconel 625 coatings with desirable microstructures and corrosion resistance.