Comparative study of diode laser welding of solid-solution/precipitation-strengthened Fe-Ni-Cr-based superalloys

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dc.contributor.authorKumar, H.
dc.contributor.authorBanerjee, K.
dc.contributor.authorAqeel, M.
dc.contributor.authorShariff, S.M.
dc.date.accessioned2026-02-03T13:19:24Z
dc.date.issued2025
dc.description.abstractThis study investigates autogenous diode laser welding of two differently strengthened Fe-Ni-Cr superalloys: solid-solution strengthened Incoloy 800 and precipitation-strengthened Incoloy A286. Effects of laser power, welding speed, and defocusing distance on weld bead geometry, microstructure, and mechanical properties were comprehensively analyzed. Butt weld joints produced with optimum and similar heat input conditions achieved joint efficiencies comparable to their base metals. Microstructural analysis of fusion zone revealed columnar dendrites of ?-(Ni,Fe) in both alloys, with A286 showing segregation of Ti, Cr, and Mo intermetallics at interdendritic regions, while Incoloy 800 exhibited refined columnar/equiaxed dendrites with chromium carbides and Fe-Ni-Ti intermetallics. Mechanical testing indicated enhanced yield strength but reduced impact toughness and marginal hardness gain in A286 welds, whereas Incoloy 800 welds maintained similar hardness to the base material. Overall, the study demonstrated utilization of fiber-coupled diode laser welding for producing butt-joints in both superalloys, supporting their potential adoption in high-temperature applications. © 2025 Taylor & Francis Group, LLC.
dc.identifier.citationMaterials and Manufacturing Processes, 2025, 40, 12, pp. 1577-1589
dc.identifier.issn10426914
dc.identifier.urihttps://doi.org/10.1080/10426914.2025.2535303
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/20080
dc.publisherTaylor and Francis Ltd.
dc.subjectBinary alloys
dc.subjectCarbides
dc.subjectChromium alloys
dc.subjectChromium compounds
dc.subjectDiodes
dc.subjectFracture toughness
dc.subjectHardness
dc.subjectIntermetallics
dc.subjectIron alloys
dc.subjectLaser beam welding
dc.subjectNickel alloys
dc.subjectNickel compounds
dc.subjectPrecipitation (chemical)
dc.subjectSolid solutions
dc.subjectSuperalloys
dc.subjectTernary alloys
dc.subjectTitanium alloys
dc.subjectWelds
dc.subjectComparatives studies
dc.subjectCr-based
dc.subjectDiode laser welding
dc.subjectDiode-laser
dc.subjectIncoloy 800, process optimization
dc.subjectIncoloy a286
dc.subjectJoint efficiencies
dc.subjectProcess optimisation
dc.subjectSegregation
dc.subjectSolution precipitation
dc.subjectHigh temperature applications
dc.subjectImpact strength
dc.subjectMicrostructure
dc.subjectTensile strength
dc.titleComparative study of diode laser welding of solid-solution/precipitation-strengthened Fe-Ni-Cr-based superalloys

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