Influence of the laser source pulsing frequency on the direct laser deposited Inconel 718 thin walls

Stano Imbrogno, Abdullah Alhuzaim, Moataz M. Attallah

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Abstract

The Direct Laser Deposition (DLD) process has shown significant results in manufacturing due to its relevant flexibility to refurbish high-performance components (e.g. turbine blades or disks) or fabricating complex shaped parts. The solidification microstructure during the DLD process, is known to be controllable using different process parameters that induce changes in the grain structure, micro-segregation, and phase transformations. This work focuses on the effect the frequency of the pulsed laser has on the metallurgical characteristics of deposited thin walls. More specifically, the effect of three different pulsing rates (10 Hz, 100 Hz, 1000 Hz) during the deposition of the Nickel-based superalloys Inconel 718 has been studied and the results compared with parts produced by continuous wave laser mode. This work highlights how the pulsing rate significantly affected the thermal history, melt pool shape, grain size and its morphology, segregation region (Nb-enriched), and hardness. Finally, the microhardness was also evaluated and a correlation between the metallurgical characteristics and the pulsing rate was established.

Original languageEnglish
Article number158095
JournalJournal of Alloys and Compounds
Volume856
Early online date25 Nov 2020
DOIs
Publication statusPublished - 5 Mar 2021

Bibliographical note

Funding Information:
The authors would like to acknowledge the European research project that founded this research. The project belongs to Horizon 2020 research and innovation programme Novel ALL-IN-ONE machines, robots, and systems for affordable, worldwide and lifetime Distributed 3D hybrid manufacturing and repair operations (Project ID: 723795). AA would like to acknowledge the funding by the Royal Commission for Jubail and Yanbu (Kingdom of Saudi Arabia) for funding his Ph.D. project.

Keywords

  • Direct laser deposition
  • Inconel 718
  • Microstructure
  • Pulsing laser

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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