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 |
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Hauptverfasser: | , , |
Format: | Artikel |
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. |
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ISSN: | 0030-3992 1879-2545 |
DOI: | 10.1016/j.optlastec.2018.07.037 |