About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Thermokinetics and Associated Microstructural Evolution of Laser Powder Bed Fused Additively Manufactured Ti6Al4V |
Author(s) |
Mangesh Vyankat Pantawane, Narendra B Dahotre |
On-Site Speaker (Planned) |
Mangesh Vyankat Pantawane |
Abstract Scope |
The laser powder bed fusion additive manufacturing (LPBF-AM) often leads to thermokinetically evolved non-equilibrium microstructural state of the phases. The versatility of this additive manufacturing process can be exploited by understanding its thermokinetics by finite element method based three-dimensional computational modeling. In the laser powder bed fused Ti6Al4V, the non-equilibrium state of the martensitic phase can be realized by repetitive high cooling rates in the range of 4.82×105 K/s-2.56×105 K/s. Besides, the orientations of the prior β grains (002 texture), as well as the orientations of martensite laths within them, are influenced by the steep thermal gradients (1.48×106 K/m-5.18×107 K/m) directed at a given location and time. The martensitic laths further undergo the repetitive heating-cooling events while building a layer through multi-laser tracks and subsequent layers above it. This leads to compositional inhomogeneity within the martensite laths, as seen through atom probe tomography. |
Proceedings Inclusion? |
Planned: |