ZL114A铝合金激光选区熔化成形工艺

Selective Laser Melting Forming Process of ZL114A Aluminum Alloy

以ZL114A铝合金粉末为研究对象,主要研究激光选区熔化(SLM)成形主要工艺参数如激光功率、扫描速度、扫描间距、铺粉厚度等对ZL114A成形试样致密度的影响。结果表明,SLM成形ZL114A合金试样的致密度随着激光功率的增大而增大;而随着扫描速度的增大,试样的致密度则呈现先增大后减小的趋势;当激光功率为450 W,扫描速度为2 000 mm/s,扫描间距为0.09 mm,铺粉厚度为0.05 mm时,试样致密度最大可达到99.92%,其SLM沉积态合金的常温平均抗拉强度为402.7 MPa,伸长率为6.0%。进一步引入能量密度模型,综合表征能量输入与试样致密度之间的作用关系,当能量密度在35～100 J/mm^3范围内,其致密度均可达99%以上。

Taking ZL114A aluminum alloy powder as the research object, the influences of main technical parameters in the selective laser melting （SLM） forming process such as laser power, scanning speed, scanning interval, and powder coating thickness on the density of SLM-produced ZL114A alloy samples were studied. The results show that the density of the ZL114A alloy samples increases with the increase of the laser power, while with the increase of the scanning speed, the density of the samples increases first and then decreases. With a laser power of 450 W, a scanning speed of 2 000 mrn/s, a scanning interval of 0.09 mm, and a powder coating thickness of 0.05 mm, the maximum density of the SLM-produced sample can reach 99.92%, and its average tensile strength is 402.7 MPa and the elongation is 6.0%. Furthermore, the energy density model was introduced to comprehensively characterize the relationship between the energy input and the density of SLM-produced samples. When the energy density is in the range of 35 to 100 J/mm^3, the relative density of the samples can reach more than 99%.