|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advances in Additive Manufacturing of Titanium and Titanium Based Alloys
||Ti-6Al-4V by Selective Laser Melting: How Microstructure and Porosity Influence the Mechanical Properties
||Thomas Voisin, Nicholas P. Calta, Jianchao Ye, Joseph T. McKeown, Ross Cunningham, Anthony Rollett, Morris Y. Wang
|On-Site Speaker (Planned)
Ti-6Al-4V alloy (Ti64) made by selective laser melting (SLM) have been widely characterized in term of microstructures and mechanical properties. Very high yield strengths have been reported for the as-SLM material however, the elongation-to-failure is often reported to be below 10%. In this work, we use mechanical testing, microscopy (TEM, SEM), and X-ray synchrotron (in situ diffraction and tomography) to characterize the deformation of Ti64 samples made with various laser power and speed. We show that the orientation of the build direction during tensile testing is important not only due to the columnar growth but also due to the porosity. In fact, when sample are deformed horizontally (build direction 90° from the tensile direction) pores grow along laser tracks and lead to a catastrophic failure at the onset of necking. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
||Planned: Supplemental Proceedings volume