| Author(s) |
Mohan Sai Kiran Kumar Yadav Nartu, Srinivas Aditya Mantri, Abhishek Sharma, Eugene Ivanov, Kyu Cho, Brandon McWilliams, Narendra Dahotre, Rajarshi Banerjee |
| Abstract Scope |
During the additive manufacturing (AM) of titanium alloys of a wide variety of compositions, including α + β alloys such as Ti-6Al-4 V, and β alloys, when the laser or electron beam hits the sample, grains in the previously deposited topmost layers transform into the β phase. Subsequently, during cooling cycle, depending on alloy composition, second-phase precipitation may occur within these layers via solid-state precipitation. This study compares two binary model β -Ti alloys, Ti-12Mo and Ti-20 V and two commercial metastable β-Ti alloys, Ti-1Al-8V-5Fe (Ti-185), Ti-10V-2Fe-3Al (Ti-10-2-3), that have been processed using laser engineered net shaping (LENS), AM technique. Compared to Ti-V, which exhibited grains of only the β phase in the as-built condition, the less β stabilized Ti-Mo, Ti-185, and Ti-10-2-3 had extensive second-phase precipitation (α/α''/ω) within the build. The location within the LENS build played a pivotal role in determining the size scale, area fraction, and morphology of the precipitates. |