Laser cladding of Aluminum powder and its composite with SiCp and Mo on mild steel substrate: clad layer formation and surface topography

Document Type : Research articles

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Faculty of engineering, Ain-Sham University (ASU), Cairo - Egypt

Abstract

Coating steel surfaces with hard ceramic particles in Aluminum has a great influence to improve mechanical properties and wear resistance. This research investigated direct laser deposition, where no binder is used, of pure Aluminum and its composite powder with SiCp of 30% and Mo 30% are conducted, applying laser cladding technique (LC) using coaxial cladding nozzle. The effects of SiCp and Mo content in composite and the laser processing parameters namely; laser power of 900 to 1200 watt, scan speed of 0.9 to 1.1 m.min-1 on clad layer formation and its geometry are studied. Results indicate that the clad layer forms gradually with increasing laser energy density first as aligned globular weakly bonded stacks then aligned tracks gradually overlapping, and finally a complete strong-bonded clad layer all over the specimen area, with surface waviness. The minimum clad surface waviness is obtained at the maximum laser energy density applied of 25.6 J.mm-2. Clad layer detachment phenomenon was also observed at high laser energy density.

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