Crystallographic texture and microstructure of pulsed diode laser-deposited Waspaloy

R. J. Moat, A. J. Pinkerton, L. Li, P. J. Withers, M. Preuss

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Abstract

The role of both laser pulse length and duty cycle in controlling the grain size and crystallographic texture of diode laser-deposited Waspaloy powder is investigated. Thin-walled test structures of Waspaloy have been produced using a range of pulse parameters and analyzed by means of scanning electron microscopy and electron backscatter diffraction. Results have been correlated with a simple analytical model of the effect of the laser pulse on the substrate temperature and melt-pool geometry in order to help explain the trends observed. Findings show that pulse parameters have a marked effect on the resulting grain morphology and crystallographic orientation. Modelling has indicated that this arises because the microstructure is highly dependent on the melt-pool geometry, particularly the inclination angle of the melt-pool boundary.

Original languageEnglish
Pages (from-to)1220-1229
Number of pages10
JournalActa Materialia
Volume57
Issue number4
DOIs
Publication statusPublished - Feb 2009
Externally publishedYes

Keywords

  • Electron backscatter diffraction
  • Laser direct metal deposition (LDMD)
  • Near-net shape manufacture
  • Nickel alloys
  • Texture

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