Abstract
Inconel 625 based alloys with different iron contents were prepared by arc-melting. Alloys with up to 5 wt.% iron are composed of the γ matrix, metal monocarbides (MC) and Laves precipitates. Alloys with 10-15 wt.% iron comprise the γ matrix and γ/Laves eutectic-like constituent. MC precipitates are cathodic and the Laves phase anodic with respect to the matrix. In 3.5 wt.% NaCl, alloys with 10-15 wt.%, iron showed improved corrosion behaviour compared to 5 wt.% iron due to absence of MC phase formation. The results are important as they potentially allow faster and more economical welding processes to be employed.