激光选区熔化成形GH3536高温合金缺陷及质量控制

Defect and Quality Control of GH3536 Super Alloy Fabricated via Laser Selective Melting

为了研究激光选区熔化GH3536高温合金成形工艺对成形件内部缺陷类型、尺寸、数量的影响,采用激光选区熔化设备进行样件制备,对其进行抛光态观察和致密度、缺陷数量测试,并分析了合金的缺陷类型、尺寸分布及数量。研究表明:随着工艺参数的改变,能量密度逐渐增加,成形件致密度逐渐增加,并趋于稳定。在79.17~92.59 J/mm^(3)的能量密度范围内,样件内部均匀致密,无缺陷;随着能量密度逐渐增大或者降低,样件内部主要为气孔型缺陷,气孔尺寸<0.1 mm。能量密度≤48.87 J/mm^(3)时,样件内部缺陷主要为未熔合及微裂纹。

In this study,we investigate the influence of the forming process on the types,sizes,and quantities of internal defects in a GH3536 alloy fabricated via laser selective melting.We test the microstructure,density,and defect quantity,along with the defect type,size distribution,and quantity of the alloy.The research shows that a change in the process parameters gradually increases the energy density,with the density of the formed parts gradually increasing before stabilizing.The sample is uniform and dense without defects within 79.17‒92.59 J/mm^(3) of the energy density.With the gradual increase or decrease in the energy density,the internal defects of the sample are mainly pore-type defects with a pore size<0.1 mm.When the energy density≤48.87 J/mm^(3),non-fusion and micro cracks primarily constitute the internal defects of the sample.