Reuse of Grade 23 Ti6Al4V Powder during the Laser-Based Powder Bed Fusion Process

被引:23
|
作者
Harkin, Ryan [1 ]
Wu, Hao [1 ]
Nikam, Sagar [1 ]
Quinn, Justin [1 ]
McFadden, Shaun [1 ]
机构
[1] Ulster Univ, Fac Comp Engn & Built Environm, Derry BT48 7JL, Londonderry, North Ireland
关键词
selective laser melting; laser-based powder bed fusion; additive manufacturing; powder recycling; powder characterisation; ELI (Grade 23) Ti6Al4V; TI-6AL-4V POWDER; OXYGEN;
D O I
10.3390/met10121700
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Titanium alloy powder used for laser-based powder bed fusion (L-PBF) process is costly. One of the solutions is the inclusion of a powder recycling strategy, allowing unused or exposed powder particles to be recuperated post manufacture, replenished and used for future builds. However, during a L-PBF process, powder particles are exposed to high levels of concentrated energy from the laser. Particularly those in close proximity to the melt pool, leading to the formation of spatter and agglomerated particles. These particles can settle onto the powder bed, which can then influence the particle size distribution and layer uniformity. This study analysed extra-low interstitial (ELI) Ti6Al4V (Grade 23) powder when subjected to nine recycle iterations, tracking powder property variation across the successive recycling stages. Characterisation included chemical composition focusing upon O, N, and H content, particle size distribution, morphology and tapped and bulk densities. On review of the compositional analysis, the oxygen content exceeded the 0.13% limit for the ELI grade after 8 recycles, resulting in the degradation from Grade 23 level.
引用
收藏
页码:1 / 14
页数:14
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