Fabrication of micro-fine spherical Ti-6Al-4V alloy powders based on hydrogen decrepitation and plasma spheroidisation
Fabrication of micro-fine spherical Ti-6Al-4V alloy powders based on hydrogen decrepitation and plasma spheroidisation
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DOI：
10.1080/00325899.2016.1147131
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发表时间：
2016-01-01
影响因子：
1.4
通讯作者：
Qu, X. H.
中科院分区：
文献类型：
--
作者：
Liu, C. C.;Lu, X.;Qu, X. H.
开发了一种可伸缩制备微细球形Ti-6Al-4V合金粉末的新工艺。氢化处理的Ti-6Al-4V合金铸锭被机械粉碎成颗粒，然后筛分成三个尺寸等级。粉末分别通过射频(RF)Ar等离子体系统进行球化。研究了该材料的制备工艺和粉末特性。结果表明，氢化处理后的合金铸坯可被有效地粉碎成5-76微米的细小颗粒，在射频等离子体处理过程中，由于氢爆，粉末被大大细化，随后转变为球形。氢爆对颗粒细化的影响随着原料粉末粒度的减小而减弱。球形粉末的粒度分布较窄，平均粒径在8.2~27.9微米之间，球形粉末主要由β-钛和TiH1.5组成。
A novel process was developed for scalable fabrication of micro-fine spherical Ti-6Al-4V alloy powders. The hydrogenation-treated Ti-6Al-4V alloy ingot was mechanically crushed into particles and then sieved into three size grades. The powders were separately sent through the radio frequency (RF) argon plasma system for spheroidisation. The fabrication process and powder characteristics were investigated. The results indicate the alloy ingot upon hydrogenation treatment can be efficiently crushed into fine particles with size of 5-76 mu m. During RF plasma processing, the powders are found to be greatly refined due to hydrogen decrepitation with subsequent transformation into spherical morphology. The effect of hydrogen decrepitation on particle refinement is impaired with decreasing particle size of feed powders. The spherical powders exhibit a narrow particle size distribution and the average size is in the range of 8.2-27.9 mu m. The spheroidised powders mainly consist of beta-Ti and TiH1.5.