Influence of scan strategy on porosity and microstructure of Ti-6Al-4V fabricated by electron beam powder bed fusion

被引：27
|
作者：
Nandwana P. [1 ]
Lee Y. [2 ]
机构：
[1] Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge
[2] Computational Science and Engineering Division, Oak Ridge National Laboratory, Oak Ridge
来源：
Materials Today Communications | 2020年 / 24卷
关键词：
Additive manufacturing; Electron beam melting; Porosity; Spot melting; Ti-6Al-4V;
D O I：
10.1016/j.mtcomm.2020.100962
中图分类号：
学科分类号：
摘要：
Ti-6Al-4V is of high value in biomedical, aerospace, and industrial sectors and is ideal for additive manufacturing (AM) because of its poor machinability. In electron beam powder bed fusion of Ti-6Al-4V, a raster scan is commonly used and often results in porosity that is detrimental to the fatigue strength. In this paper, we demonstrate that spot melting can significantly minimize porosity but produces a coarser microstructure compared to raster melting. Process parameters can be optimized to achieve minimal porosity with tailored microstructures. A finite element method was used to rationalize these observations. © 2020
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