|About this Abstract
||MS&T23: Materials Science & Technology
||Phase Transformations and Microstructure Evolution during Post-Processing of Additively Manufactured Metals
||Influence of Post Processing Annealing on Precipitation and Deformation Behavior of Additvely Processed Beta Titanium Alloys
||Srinivas Aditya Mantri, Mohan Sai Kiran Kumar Yadav Nartu, Sriswaroop Dasari, Abhishek Sharma, Riyadh Salloom, Fan Sun, Srinivasan Srivilliputhur, Narendra Dahotre, Frederic Prima, Rajarshi Banerjee
|On-Site Speaker (Planned)
Laser powder bed fusion (LBPF) was employed to fabricate a strain-transformable beta Ti alloy, Ti-10V-2Fe-3Al. While the alloy is known to exhibit transformation-induced plasticity (TRIP), under tensile loading the as-fabricated alloy did not exhibit the TRIP effect, due to the formation of isothermal omega precipitates, resulting from the repeated heating-cooling cycles experienced during the LBPF process leads to the early stages of rejection of solute elements (Fe, V, and Al). Interestingly, after annealing the LPBF processed alloy above the beta solvus temperature and quenching, athermal omega forms, and the TRIP/TWIP effects were reactivated, resulting in substantial recovery of tensile ductility and an exceptionally high strain hardening rate. When annealed below the beta solvus temperature, the LPBF processed Ti-10-2-3 exhibited a large fraction of intra-granular alpha precipitates, even for short annealing times, leading to an increase in yield strength, while maintaining substantial strain hardenability. The underlying mechanisms will be discussed.