| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Composition–Processing–Microstructure-Property Relationships of Titanium Alloys
|
| Presentation Title |
Metastable and Stress-Induced Transformations in Additively Processed Ti-10V-2Fe-3Al |
| Author(s) |
M.S.K.K.Y Nartu, Tirthesh Ingale, Srinivas Aditya Mantri, Sriswaroop Dasari, Abhishek Sharma, Fan Sun, Frederic Prima, Narendra Dahotre, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Rajarshi Banerjee |
| Abstract Scope |
Laser powder bed fusion (LBPF) was employed to fabricate a strain-transformable betaTi alloy, Ti-10V-2Fe-3Al (wt. %). While this alloy is known to exhibit transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) in its conventionally processed form, under tensile loading, the LPBF as-fabricated alloy did not exhibit the TRIP/TWIP effects. This was due to the formation of isothermal omega precipitates, resulting from the repeated heating-cooling cycles experienced during the LBPF process. Interestingly, after annealing the LPBF processed alloy above the beta transus temperature and quenching, 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 transus, 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. |