|About this Abstract
||MS&T23: Materials Science & Technology
||Phase Transformations and Microstructure Evolution during Post-Processing of Additively Manufactured Metals
||Tuning the Precipitate Microstructure in the Selective Laser Melted Ti-6Al-2Sn-4Zr-2Mo Alloy via Post Heat Treatment
||Deepak V. Pillai, Sydney Fields, Dian Li, Yufeng Zheng
|On-Site Speaker (Planned)
Near-alpha Titanium alloys are widely used for high temperature applications in the field of aerospace due to its superior creep properties. Additive manufacturing (AM) is gaining a large acceptance in the manufacturing of hard-to-machine Ti alloys. The major challenge with the AM near alpha Ti alloys is the intricate martensitic microstructure with high strength but poor ductility. In this work, the microstructure evolution in selective laser melted (SLM) Ti-6Al-2Sn-4Zr-2Mo alloy during post heat treatment was studied using advanced scanning and transmission electron microscopy. It was found that the prior beta phase has columnar grains along the build direction with acicular alpha/alpha’ martensite phases throughout the beta matrix. The initial martensitic phase subjected to decomposition during post heat treatment, leading to a final microstructure with coarse primary alpha and fine secondary alpha precipitates. This work is supported by the NSF CAREER Award, grant DMR – 2145844.