Direct laser deposition of crack-free CM247LC thin walls: mechanical properties and microstructural effects of heat treatment

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Abstract

CM247LC is classified as a non-weldable Ni alloy due to the high Ti + Al content, which makes it susceptible to cracking. It is particularly prone to microcracking when processed by direct laser deposition (DLD). In this work, multiple single walls were manufactured by DLD in CM247LC using two different laser modes: continuous wave and pulse wave (PW). The manufactured walls were studied during processing and post-processing, and characterised by scanning electron microscopy, electron backscattered diffraction, thermal analysis and X-ray diffraction. The results indicate that crack-free conditions during the deposition process and the subsequent thermal processing can be achieved using the PW laser mode and that this can also lead to outstanding mechanical properties.

Original languageEnglish
Article number110123
JournalMaterials and Design
Volume211
Early online date24 Sep 2021
DOIs
Publication statusE-pub ahead of print - 24 Sep 2021

Keywords

  • Nickel Superalloy
  • CM247LC
  • Direct Laser Deposition
  • Microstructure
  • Mechanical properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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