Effects of process variables and size-scale on solidification microstructure in beam-based fabrication of bulky 3D structures

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Microstructure, texture and mechanical property evolution during additive manufacturing of Ti6Al4V alloy for aerospace applications (2012, methodology): “The efficiency of the laser beam was considered to be 36 % [121] and a similar efficiency has been reported for laser beam deposition by other authors [29, 48, 118, 122].”
An Overview of Additive Manufacturing of Titanium Components by Directed Energy Deposition: Microstructure and Mechanical Properties (2017, background): “On the other hand, by increasing the laser scan speed the size of α and β laths decreases and the level of porosity increases [48].”