Technical analysis of laser surface melting on Mg alloy
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1.
School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
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2.
StateKey Laboratory for Materials Modification, Dalian University of Technology, Dalian 116024, China;
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3.
School of Material Scienceand Engineering, Changchun University of Technology, Changchun 130012, China
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Corresponding author:
GAO Ya-li, dehuigvl@126.com
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Received Date:
2008-04-23
Accepted Date:
2008-05-22
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Abstract
In order to study the influence of different laser parameters on the microstructure and property of the melted layer of Mg alloy,two laser melting techniques at high power,rapidly scanning speed(13J/mm2～33J/mm2)and low power,slowly scanning speed(100J/mm2～250J/mm2)were used to melt the surface of Mg alloy respectively. The results showed that the melted layers with both the techniques were composed of α-Mg and β-Mg17Al12 phases,however,the melted layers at low power,slowly scanning speed had more β-Mg17Al12,about 16%. The microstructure of the melted layers were typical dendrite,however,the dendritic spacing of the melted layers at high power,rapidly scanning speed was much smaller. The microhardness and wear resistance of the melted layers at high power,rapidly scanning speed were 1.5 and 3 times of that of the melted layers at low power, slowly scanning speed,respectively. The melted layers at high power,rapidly scanning speed had better corrosion resistance too.
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