Abstract
Many novel designs for additive manufacturing (AM) contain thin-walled (≤ 3 mm) sections in different orientations. Selective electron beam melting (SEBM) is particularly suited to AM of such thin-walled titanium components because of its high preheating temperature and high vacuum. However, experimental data on SEBM of Ti-6Al-4V thin sections remains scarce because of the difficulty and high cost of producing long, thin and smooth strip tensile specimens (see Fig. 1). In this study, 80 SEBM Ti-6Al-4V strips (180 mm long, 42 mm wide, 3 mm thick) were built both vertically (V-strips) and horizontally (H-strips). Their density, microstructure and tensile properties were investigated. The V-strips showed clearly higher tensile strengths but lower elongation than the H-strips. Hot isostatic pressing (HIP) produced the same lamellar α-β microstructures in terms of the average α-lath thickness in both types of strips. The retained prior-β columnar grain boundaries after HIP showed no measurable influence on the tensile properties, irrespective of their length and orientation, because of the formation of randomly distributed fine α-laths.
Illustration of (a) vertically (V-) and (b) horizontally (H-) built strips. (c) Long, thin (2 mm) and smooth tensile specimens
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Acknowledgements
The project was supported by the National Natural Science Foundation of China (Grant No. 51528401). M. Qian further acknowledges support from the Australia Research Council (ARC) through DP150104719.
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Wang, J., Tang, H.P., Yang, K. et al. Selective Electron Beam Manufacturing of Ti-6Al-4V Strips: Effect of Build Orientation, Columnar Grain Orientation, and Hot Isostatic Pressing on Tensile Properties. JOM 70, 638–643 (2018). https://doi.org/10.1007/s11837-018-2794-3
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DOI: https://doi.org/10.1007/s11837-018-2794-3