Multi-scale characterization by neutronography and electron diffraction of Ni coating on Cu-Ni-Al or cast-iron glass molds after laser cladding - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Materials Science Forum Année : 2021

Multi-scale characterization by neutronography and electron diffraction of Ni coating on Cu-Ni-Al or cast-iron glass molds after laser cladding

Fazati Bourahima
  • Fonction : Auteur
  • PersonId : 1083972
Anne Laure Helbert
Frédéric Ott
  • Fonction : Auteur
  • PersonId : 1083974
Vincent Ji
Michel Rege
  • Fonction : Auteur
  • PersonId : 1083976
François Brisset
  • Fonction : Auteur
  • PersonId : 1081842
Arnaud Courteaux
  • Fonction : Auteur
  • PersonId : 1083978

Résumé

Laser cladding of a Ni based powder on Cu-Ni-Al or cast iron was performed with a 4kW continuous Nd: YAG laser. The Cu-Ni-Al and cast-iron substrates are used for their thermal properties in glass mold industry. But the issue of these materials is their lack of resistance on corrosion and abrasion. The role of the Ni based alloy is to protect the mold without affecting its thermal properties (Heat Affected Zone (HAZ)). The purpose of this research is to produce a well bonded Ni based melted powder without pores or cracks on a non-planar surface (curvilinear section). An investigation of the impact of the processing parameters, power (1500-3200 W), scanning speed (2.5-10 mm/s) and powder feeding rate (24.5-32.5 g/min) on the bonding quality, the porosity propagation and HAZ appearance is performed. The used methods are neutronography, Scanning Electron Microscopy, Energy Dispersive Spectroscopy and Electron BackScatter Diffraction (EBSD). These multi-scale techniques are obviously complementary. Neutronography is a well-adapted non-destructive method to observe the porosity in the volume thanks to the contrast between materials. EBSD analysis allows us to analyze the microstructural evolution of the coating notably by observing the dendrites growth. This same method also permits to observe the HAZ nature according to the laser cladding parameters. Those methods allowed to optimize the processing parameters in a way to obtain perfect bonding, to avoid porosity propagation and to limit the HAZ emergence.
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Dates et versions

hal-03035545 , version 1 (02-12-2020)
hal-03035545 , version 2 (20-07-2021)

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Citer

Fazati Bourahima, Anne Laure Helbert, Frédéric Ott, Vincent Ji, Michel Rege, et al.. Multi-scale characterization by neutronography and electron diffraction of Ni coating on Cu-Ni-Al or cast-iron glass molds after laser cladding. Materials Science Forum, 2021, 1016, pp.297-302. ⟨10.4028/www.scientific.net/MSF.1016.297⟩. ⟨hal-03035545v2⟩
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