氩气雾化Sc、Y微合金化René104镍基高温合金粉末的组织与性能

Microstructure and properties of Sc,Y microalloyed René104 nickel-based superalloy powders prepared by argon atomization

采用氩气雾化法制备Sc、Y微合金化René104镍基高温合金粉末,分析粉末的粒径分布、形貌、显微组织与性能。结果表明:氩气雾化粉末球形度高,卫星粉和异形粉少,粒径小于53μm的粉末收得率(质量分数)高达52.52%。粉末内部结构致密,显微组织为等轴晶+树枝晶,晶界处出现Ti、Nb、Ta、Mo元素的偏析。经过Sc、Y微合金化的René104镍基高温合金雾化粉末性能得到改善,流动性好,松装密度高,显微硬度、纳米硬度(HV)和弹性模量分别达到360±6、(6.5±0.4)GPa和(102.1±10.6)GPa。

Sc,Y microalloyed René104 nickel-based superalloy powders were prepared by argon atomization.The particle size distribution,morphology,microstructure and properties of the powders were analyzed.The results show that the argon atomized powders have high sphericity with less satellite powders and irregular powders,and the yield(mass fraction)of the powders with particle size less than 53μm is as high as 52.52%.The interior microstructure of the powder is dense,showing both equiaxial grain and dendrite morphology.Ti,Nb,Ta and Mo segregate at the grain boundary.By Sc,Y microalloying,the properties of René104 nickel-based superalloy powders have been improved,with good flow ability and high apparent density.Microhardness,nanohardness(HV)and elastic modulus of the powders are 360±6,(6.5±0.4)GPa and(102.1±10.6)GPa,respectively.