氩气雾化René104镍基高温合金粉末的显微组织和凝固缺陷

来源期刊:中南大学学报(自然科学版)2018年第1期

论文作者:刘祖铭 苏鹏飞 郭旸 麻梦梅 段然曦 陈仕奇

文章页码:64 - 72

关键词:氩气雾化;镍基高温合金;凝固组织;空心粉末

Key words:argon gas atomization; nickel-base superalloy; solidification structure; hollow powder

摘    要:采用氩气雾化制备René104(ME3)镍基高温合金粉末,对粉末的粒径分布、形貌、显微组织和凝固缺陷进行分析。研究结果表明:氩气雾化René104高温合金粉末氧含量较低,以球形和近球形为主;细粉收得率高,粒径小于75 μm的粉末达到70%。小于60 μm的粉末成分均匀,表面光滑,内部结构致密,具有典型的胞状晶组织。随着粒径的增大,粉末表面和内部开始出现树枝晶组织,显微组织为胞状晶+树枝晶;具有胞状晶+树枝晶组织的粉末开始出现内部凝固缩孔和空心现象,粒径大于75 μm粉末明显观察到内部凝固缩孔和空心缺陷。

Abstract: The René104 (or ME3) nickel-base superalloy powder was prepared by argon gas atomization, and its size distribution, morphology, microstructure and solidification defect were investigated. The results show that the as-atomized powder possesses a relatively low oxygen content, and most of powders are spherical or nearly spherical. The fine powder yield with the as-atomized powder particle size below 75 μm is up to 70%. The powder below 60 μm shows a homogeneous composition, smooth surface and compact structure, presenting a typical cellular morphology. With the increase of particle size, the dendrite appears both on the surface and inside of the powder, and its microstructure shows the both cellular and dendrite morphology. In these powders, the dispersed shrinkage cavity and hollow defects gradually emerge, while this phenomenon is particularly obvious for the powder with particle size above 75 μm.

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