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介绍了激光增材制造氧化铝增强镍基合金成型件的制备方法。重点介绍多层镍基合金的熔覆成型过程工艺,并对增材制造的多层氧化铝增强镍基合金的组织与性能特点做出分析,同时使用氩气保护气避免成型过程中氧化问题。实验选取参数:功率1 500 W;离焦量450mm;送粉速率8g/min;单道次向上升移量1mm。分析结果表明:成型后的沉积层高度范围在6±0.05mm。试样进行微观扫描分析后能看到气孔数量,裂纹都极少且组织均匀。分析主要性能参数有:平均抗拉强度878.51 MP,是普通镍基合金的1.5倍;平均延伸率接近10%。实验同时对激光增材制造的氧化铝增强镍基合金试样的组织形貌与性能之间的关系进行了深入的研究分析。结果表明,影响试样拉升性能主要因素有晶体的类型、尺寸以及内部结构力的方向。三者之间有着复杂的正曲线关系,共同影响着试样的物理性能。
The preparation method of laser additive for manufacturing alumina-reinforced nickel-base alloy molded parts is introduced. The process of cladding and forming process of multi-layer Ni-based alloy is introduced emphatically. The microstructure and properties of Ni-based multi-layer reinforced Al-based alloy are analyzed. At the same time, argon shielding gas is used to avoid the oxidation during forming. Experimental parameters selected: power 1 500 W; defocus amount 450mm; powder feeding rate 8g / min; single pass up to the amount of 1mm. The results show that the height of the deposited layer is 6 ± 0.05mm. After the sample microscopic scanning analysis can see the number of pores, cracks are minimal and uniform organization. Analysis of the main performance parameters are: the average tensile strength of 878.51 MP, 1.5 times the ordinary nickel-based alloy; average elongation of nearly 10%. In the meantime, the relationship between the microstructure and properties of the alumina-enhanced nickel-base alloy produced by laser additive has also been investigated. The results show that the main factors that affect the pull-up properties of the sample are the type and size of the crystal and the direction of the internal structural force. The three have a complex positive curve relationship, together affect the physical properties of the sample.