关键工艺参数对选区激光熔化稀土元素增强铝合金成形致密度的影响  

Effect of Key Process Parameters on the Relative Density of Rare Earth Elements Doped Aluminum Alloy Using Selective Laser Melting

作　　者：任治倪 徐迪 黄洁 曾志强 沈卫国 肖清明 Ren Zhini;Xu Di;Huang Jie;Zeng Zhiqiang;Shen Weiguo;Xiao Qingming(Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 201324,China;Commercial Aircraft Corporation of China Ltd.,Shanghai 200126,China)

机构地区：[1]上海飞机制造有限公司,上海201324 [2]中国商用飞机有限责任公司,上海200126

出　　处：《应用激光》2021年第6期1229-1236,共8页Applied Laser

基　　金：国家重点研发计划(2018YFB1106300)。

摘　　要：稀土元素增强铝合金作为一种适用于选区激光熔化(selective laser melting,SLM)工艺的合金,由于其良好的成形质量和优越的力学性能而得到了广泛应用。但其成形质量由成形参数决定。通过控制激光功率、扫描速度、扫描间距等关键工艺参数的变化,研究了关键工艺参数的变化对选区激光熔化稀土元素增强铝合金的致密度、缺陷类型演变的影响。结果表明,工艺参数的变化会导致能量密度的变化,合金致密度由体能量密度和线能量密度共同影响,当体能量密度在70~180 J/mm;且线能量密度为0.250~0.525 J/mm时,合金致密度能够稳定在99.5%以上。As an alloy suitable for selective laser melting(SLM)process,rare earth elements doped aluminum alloy has been widely used due to its superior mechanical properties and good formability.The forming quality is determined by the processing parameters.In this paper,by controlling key process parameters such as laser power,scanning velocity and hatch spacing,the evolution of relative density and defect types of SLM rare earth elements doped aluminum alloys at different process parameters are studied.The results show that changes in process parameters will lead to changes in energy density,the relative density of the alloy is affected by the volumetric energy density and the liner energy density of the single pass.When the volumetric energy density is 70-180 J/mm;and the liner energy density is 0.250-0.525 J/mm,the relative density of the alloy is stable above 99.5%.

关 键 词：选区激光熔化 稀土元素增强铝合金 工艺参数 致密度 

分 类 号：TG146[一般工业技术—材料科学与工程]