Influence of interlayer dwell time on the microstructure of Inconel 718 Laser Cladded components

• Published in: Optics and laser technology Vol. 128; p. 106218
• Main Authors: Guévenoux, Camille, Hallais, Simon, Charles, Alexandre, Charkaluk, Eric, Constantinescu, Andrei
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-08-2020; Elsevier BV; Elsevier
• Subjects: Additive manufacturing; Chemical and Process Engineering; Component reliability; Direct Laser Deposition; Dwell time; Electron Back Scattering Diffraction (EBSD); Engineering Sciences; Grain size; Interlayers; Laser beam cladding; Materials; Microstructural gradient; Microstructure; Nickel alloys; Nickel base alloys; Process parameters; Superalloys; Nickel alloys; Additive manufacturing; Electron Back Scattering Diffraction (EBSD); Microstructural gradient; Direct Laser Deposition; Electron BackScattering Diffraction (EBSD); microstructural gradient
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2020.106218

[Display omitted]
•Characterization of Inconel 718 Laser Cladded microstructures by EBSD analyses.•Impact of an interlayer dwell time on grains morphology and orientation.•Cooling mechanisms highlighted: convection (surface) and conduction (kernel).•Simplified thermal analysis based on melt pool shapes and solidification maps.
Laser Cladding is one of the leading additive manufacturing technologies enabling the repair of metallic components. Their fatigue reliability depends directly on the material microstructure and consequently on the process parameters. This study highlights the influence of the interlayer dwell time on single-track walls for Inconel 718 repaired components. EBSD analyses show that dwell time both reduces grain size and creates a textural stretch of the microstructure. An optimal dwell time between the writing of successive layers can then be introduced to target a specified microstructure gradient at the interface between the original part and the repaired deposit.