Surface integrity of hybrid CM247LC /Inconel 718 components produced by laser directed energy deposition

Aldi Mehmeti*, Prveen Bidare, Stano Imbrogno, David Wimpenny, Khamis Essa, Stefan Dimov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
16 Downloads (Pure)


High-temperature alloys pose significant challenges in additive manufacturing. These materials have unique properties, such as high resistance to mechanical and chemical degradation when exposed to high temperatures. Furthermore, when these alloys are used to produce hybrid components with other similar alloys, investigating their surface integrity is critical because any residual stress can lead to early stage cracks and poor fatigue performance. In this research, a hybrid manufacturing approach is employed to produce components from difficult to weld alloys, i.e. CM247LC deposited on IN718 through a laser based direct energy deposition (L-DED) process. The surface integrity, mechanical properties and microstructure of such hybrid components is investigated, especially their welding/joint areas. Crack-free processing regimes were established to deposit CM247LC while mitigating the negative effects onto the microstructure of the Inconel substrate. Especially, the thermal gradients were managed to deliver crack free sections of CM247LC with good interface bonding, strength and fine microstructure. It is important to note that this is achieved without any significant preheating that contrasts with what is reported in other investigations so far. Furthermore, end-use hybrid blisks with deposited CM247LC blades onto Inconel 718 disks (HUB) were manufactured and then machined within a single processing set-up. The results show that the substrate thickness, the machining between the deposited layers and the final machining and heat-treatment play a role in reducing residual stresses. Ultimately, such hybrid manufacturing approach can be considered a new solution for producing such components and also for their subsequent repair.

Original languageEnglish
Pages (from-to)4961–4980
Number of pages20
JournalThe International Journal of Advanced Manufacturing Technology
Issue number7-8
Early online date13 Jul 2022
Publication statusPublished - Aug 2022

Bibliographical note

Funding Information:
This study was funded by the ESPRC grant (EP/M507672/1) and the ERDF “Smart Factory Hub” (SmartFub) projects and the Manufacturing Technology Centre (MTC) for the financial support of Aldi Mehmeti’s Ph.D. research.

Publisher Copyright:
© 2022, The Author(s).


  • Additive manufacturing of CM247LC/Inconel718
  • Bonding interface
  • Hybrid blisk
  • Mechanical properties
  • Microstructure observation
  • Residual stresses
  • Surface integrity of hybrid components

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering


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