Author(s): GAO Ya-li, WANG Cun-shan, ZHANG Mei, XIONG Dang-sheng
Pages: 362-365
Year: 2009 Issue:  4
Journal: Laser Technology
Keyword:  laser technique; Mg alloy; technology parameter; microstructure; property;
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 αMg and βMg17Al12 phases,however,the melted layers at low power,slowly scanning speed had more βMg17Al12,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.