Laser surface melting of Al-12Si-4Cu-1.2Mn alloy Online publication date: Sun, 01-Jul-2018
by Woldetinsay Gutu Jiru; Mamilla Ravi Sankar; Uday Shanker Dixit; Hengcheng Liao
International Journal of Mechatronics and Manufacturing Systems (IJMMS), Vol. 11, No. 2/3, 2018
Abstract: This work investigated mechanical and metallurgical properties of Al-12Si-4Cu-1.2Mn high temperature alloy after laser surface melting using CO2 laser. The effect of laser specific energy on the quality of remelted surface was studied. Two kinds of substrate materials were compared - solutionised heat treated at 510°C and as-cast. The dendrite microstructure and refined grains with reduced average grain size improved the mechanical properties of laser surface remelted alloy. The micro-hardness of the alloy increased by 2.5 times for heat treated and 2.6 times for as-cast samples. The ultimate tensile strength increased by 70% and 23% for as-cast and heat treated alloys, respectively. Scratch resistance improved and coefficient of friction reduced. In general, low laser specific energy provided better results. Overall good mechanical properties were obtained when as-cast samples were remelted by CO2 laser at 45-50 J/mm2 laser specific energy.
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