Laser assisted direct energy deposition of Hastelloy-X

•Laser assisted direct energy deposition of defect free Hastelloy-X (Hast-X).•Process window is identified for defect free deposition at maximum deposition rate.•Uniform deposition with fine dendritic microstructure was obtained.•Potential near-net shape fabrication of complex shaped Hast-X componen...

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Veröffentlicht in:Optics and laser technology 2019-01, Vol.109, p.14-19
Hauptverfasser: Jinoop, A.N., Paul, C.P., Bindra, K.S.
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Sprache:eng
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Zusammenfassung:•Laser assisted direct energy deposition of defect free Hastelloy-X (Hast-X).•Process window is identified for defect free deposition at maximum deposition rate.•Uniform deposition with fine dendritic microstructure was obtained.•Potential near-net shape fabrication of complex shaped Hast-X components. Laser additive manufacturing using direct energy deposition (LAM-DED) process uses laser beam to melt powder particles and a thin layer of substrate/previously deposited material for building near net shape of engineering components. This communication reports the process development for LAM-DED of Hastelloy-X (Hast-X) and its characterization. Process window is developed through experimental program by varying LAM-DED process parameters for defect free deposition of Hast-X at maximum deposition rate. Optical microscopy shows microstructures with fine dendrites, while the presence of FCC matrices with fine crystallites (size = 25.56 nm) are revealed during X-ray diffraction studies. Residual stress measurement reveals predominantly tensile stress on the deposited surface with a maximum value of 252 MPa. Atomic Force Microscopy revealed uniform surface topography and measured average micro-hardness is 239 HV1.96N. This research work paves a way for the fabrication of Hast-X components for various engineering applications.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2018.07.037