Effect of heat treatment on microstructure, corrosion resistance, and interfacial characteristics of Inconel 625 laser cladding layer

Effects of welding parameters on Inconel 625 coating synthesised by tungsten inert gas cladding

“…It could be assumed that the precipitates are intermetallics of Nb and Mo, which formed through the eutectic reaction L → γ + Intermatallic according to a previous investigation. 15 With the growing of the cellular or cellular dendrites, solute atoms such as Nb and Mo were precipitated at the inter cellular or inter dendrite spaces, leading to their accumulation and occurrence of the eutectic reaction, resulting to the formation of the Nb-Mo intermatallic. With the welding speed was decreased from 300 to 260 mm/min and the heat input increased from 300 to 325 J/mm, the width of the welding pool increased but the depth decreased, which resulted in the decrease of dilution ratio, as the EDS 1 and 2 in Table 6 showed.…”

“…5,13,14 The shape and amount of the laves phase has effects on the corrosion resistance of the coating. 15,16 In actual TIG cladding production processes, welding parameter optimisations for further improving production efficiency under the premise of cladding quality are invariable topics. A previous investigation has shown that the thickness of the single pass cladding layer could be increased by reducing the welding speed at a constant wire feeding speed, which can improve the production efficiency.…”