|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advances in Additive Manufacturing of Titanium and Titanium Based Alloys
||In-situ Microstructural Control in Ti-6Al-4V during Selective Laser Melting – from Fine Acicular α' Martensite to Various Forms of Lamellar α+β
||Wei Xu, Edward Lui, Milan Brandt, Ma Qian
|On-Site Speaker (Planned)
The microstructure in Ti-6Al-4V made by SLM is commonly featured by acicular α' martensite in columnar prior-β grains. This predominantly martensitic structure results in Ti-6Al-4V having higher tensile strengths than its conventional wrought counterparts, but often suffering premature fracture due to inadequate ductility. To date, the traditional lamellar α+β microstructure is not readily achievable in Ti-6Al-4V manufactured by the current SLM practice because of the inherent high cooling rate that favours martensitic transformation. Recently, we show that through the proper selection of SLM parameters the α' martensite can in situ decompose into the more desired lamellar α+β microstructures with tuneable spacing from 150 nm to several microns. Such lamellar α+β microstructures exhibit excellent tensile properties that exceed those of the Ti-6Al-4V made by other common additive manufacturing processes. This development marks an important step forward in tailoring the microstructure in situ for the development of high-performance Ti-6Al-4V by SLM.
||Planned: Supplemental Proceedings volume