Structure and properties of laser-cladded Inconel 625-based in situ composite coatings on S355JR substrate modified with Ti and C powders

Abstract

This article presents the research results on the production of laser-cladded Inconel-625 in situ composite coatings on the S355JR substrate by addition of titanium and graphite powders to pure Inconel 625 alloy powder mixture for increased hardness and erosive wear resistance of the coatings. The research featured in the article includes penetrant testing, macro-, and microscopic observations of produced coatings, phase and chemical composition analysis, hardness and solid particle erosion tests. The results showed that the addition of titanium and graphite powders resulted in the composite microstructure formation by precipitation of Ti, Nb, Mo, and C-rich blocky and eutectic particles during crystallization. The conducted tests revealed that the microstructure change resulted in an increase in hardness and erosive wear resistance by 27% and 30%, respectively.

The Influence of the Hot Working Tool Steel Substrate Material on the Element Distribution, Microstructure and Hardness of Gas Metal Arc Welding Hardfaced Layers

“…The surfacing processes using high energy density welding processes are being considered recently as well, like plasma transfer arc (PTA) [17,18] or laser cladding (LS) [19,20]. The powder-based surfacing processes show quite important advancement in terms of feedstock materials, where the complex composite materials can be applied [21,22]. The latest studies show also the attempts at using additive manufacturing approaches for local and precise die remanufacturing, mainly by directed energy deposition (DED) processes, like laser metal deposition [23][24][25] or wire arc additive manufacturing (WAAM) [26].…”