|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pioneers in Additive Manufacturing
||AFRL Contributions to Additive Manufacturing of Titanium, ca 2000
||Pamela Kobryn, Lee Semiatin
|On-Site Speaker (Planned)
From 1998-2003, the Air Force Research Laboratory performed extensive R&D on powder deposition of Ti-6Al-4V using both low-power (LENS™) and high-power (LAM™) systems. Major areas of research focused on the effect of process variables on microstructure evolution and properties and the application of such AM techniques to fabricate preforms for forging. In the former area, the effects of laser power, scan rate, and substrate texture on the microstructure and texture of the build were established. Microstructure observations were interpreted within the context of a solidification (G-vs-R) map previously developed at AFRL for macro-solidification processes. Mechanical properties were found to be comparable to those of castings; noticeable improvements were obtained when post-deposition HIP was used. In the forging area, it was shown that the breakdown of the transformed microstructure in AM preforms of Ti-6Al-4V followed trends similar to those for conventional ingot-metallurgy products.
||Planned: Supplemental Proceedings volume