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JWJ > Volume 29(2); 2011 > Article
Journal of KWJS 2011 April;29(2) :88-93.
Published online May 7, 2011.
Effects of Average Power on Laser Cladding of Hypereutectic Al-Si Alloy on Al 1050 Alloy
Hyoung-Keun Lee
Correspondence:   Published online May 7, 2011
ABSTRACT
  This study produced hypereutectic Al-Si clad layer on 1050 Al alloy by a novel laser cladding method. Pure Si powder was mixed with organic binder to make fluid paste which could be screen-printed on the 1050 Al alloy plate. Pulsed Nd:YAG laser was irradiated on the Si paste layer to melt and alloy with Al substrate. Different laser power of 99 W, 179 W and 261 W, was used to see the difference of the microstructure, composition and hardness of the clad layers. When laser power of 179 W was used, the clad layer had overall Si content of 38wt% and composed of fine primary Si particles and fine eutectic phase. At laser power of 261 W, the clad layer had overall Si content of 24wt% and composed of mainly fine eutectic phase. Vickers hardness of HV176.7 and HV150.3 on the clad layer was obtained at laser power of 179 W and 261 W, respectively.
Keywords: Pulsed laser;Cladding;Hypereutectic Al-Si alloy;Microstructures;Vickers hardness
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