Abstract
Laser-based additive manufacturing processes are increasingly used for fabricating components made of nickel-based superalloys. The microstructure development, and in particular the precipitation of secondary phases, is of great importance for the properties of additively manufactured nickel-based superalloys. This paper summarizes the literature data on the microstructure of Inconel 625 superalloy manufactured using laser-based powder-bed fusion and directed energy deposition processes, with particular emphasis on the phase identification of precipitates. The microstructure of Inconel 625 manufactured by laser-based directed energy deposition in as-built condition is investigated by means of light microscopy and transmission electron microscopy. Phase analysis of precipitates is performed by the combination of selected area electron diffraction and microanalysis of chemical composition. Precipitates present in the interdendritic areas of as-built Inconel 625 are identified as MC and M23C6 carbides as well as the Laves phase.
Highlights
Inconel 625 is a nickel-based superalloy widely used for both high and low-temperature applications requiring the combination of high strength, corrosion resistance, good formability, and weldability
Inconel 625 is classified as solid solution strengthened superalloy, its additional strengthening may be derived by precipitation of carbides and/or intermetallic phases
Inconel 625 superalloy produced by laser-based additive manufacturing processes shows high susceptibility toward precipitation of carbides and intermetallic phases
Summary
Inconel 625 is a nickel-based superalloy widely used for both high and low-temperature applications requiring the combination of high strength, corrosion resistance, good formability, and weldability. INCONEL® is the trademark of the Special Metals Corporation group [1] and other companies use different trade names, like Haynes® 625 [2], VDM® Alloy 625 Nicrofer 6020. As in other publications devoted to this alloy [9,10,11,12,13,14,15,16,17], the name Inconel 625 is used. In the conventional cast or wrought form, the mechanical strength of this alloy is derived primarily from solid solution strengthening of the γ phase matrix by Cr, Mo, and Nb. Inconel 625 is classified as solid solution strengthened superalloy, its additional strengthening may be derived by precipitation of carbides and/or intermetallic phases
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
