采用氩气雾化制备Al、Ti总质量分数小于4%的选区激光熔融用新型镍基高温合金粉末,对粉末的成分、物相组成、形貌、微观结构和性能等进行分析和表征。结果表明,新型镍基高温合金粉末的Al、Ti总质量分数为3.82%。小粒径粉末(粒径<20 μm)内部结构致密,以胞状晶组织为主,成分均匀,显微硬度(HV)达到265。随粉末粒径增大,粉末内部树枝晶数量增多,少量大粒径(粒径>40 μm)粉末内部出现凝固缩孔和颗粒包覆缺陷。筛分后得到的粒径为15~44 μm的粉末,粒径分布集中,中位径DV50为19.7 μm,流动性和松装密度分别达到15.14 s/50 g和4.15 g/cm3。
New nickel-based superalloy powder for selective laser melting with a total mass fraction of Al and Ti less than 4% was prepared by argon atomization. The composition, phase, morphology, microstructure and properties of the new nickel-based superalloy powder were characterized. The results show that the total mass fraction of Al and Ti in the new nickel-based superalloy powder was 3.82%. Small particle size powder (particle size<20 μm) has a compact interior structure, mainly cellular structure, and uniformly composition, and its micro-hardness (HV) reaches 265. As the particle size of the powder increases, the number of dendrites in the powder increases, and solidification shrinkage pore and particle-coating defect appear in some large-diameter (particle size>40 μm) powder. After sieving, the powder with a particle size of 15-44 μm has a concentrated particle size distribution, a median diameter DV50 of 19.7 μm, the flow- ability and apparent density are 15.14 s/50 g and 4.15 g/cm3, respectively.
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