|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location-Specific Processing-Microstructure-Property Relationships
||Massive Transformation in Ti-6Al-4V Additively Manufactured by Selective Electron Beam Melting
||Ma Qian, Shenglu Lu, Huiping Tang, David StJohn
|On-Site Speaker (Planned)
A massive transformation of the type from β (bcc) to αm (hcp) has been identified in Ti-6Al-4V (wt.%) additively manufactured by selective electron beam melting (SEBM). A variety of different patch-shaped massive grains were observed and characterised, including grain boundary (GB)-dependent but non-GB-crossing and GB-crossing massive grains which are characteristic of massive transformations. The massive grains in the as-fabricated Ti-6Al-4V consisted of ultrafine lamellar α and β phases (100 nm wide β strips) not seen in conventional Ti-6Al-4V due to in situ decomposition of the massive grains during additive manufacturing (AM). The massive transformation start temperature, growth characteristics and microstructural evolution of the massive phase grains during AM were discussed. The identification of massive transformation assists in the understanding of grain formation and microstructural development in Ti-6Al-4V during AM and provides a different pathway to the creation of novel titanium alloy microstructures by AM.
||Planned: Supplemental Proceedings volume