| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
|
| Presentation Title |
Solidification Behavior and Dissolution Mechanism of Laves Phase in Additively Manufactured Inconel 718 |
| Author(s) |
Vivek Kumar Singh, Murugaiyan Amirthalingam, Shyamprasad Karagadde, Sushil Mishra |
| On-Site Speaker (Planned) |
Vivek Kumar Singh |
| Abstract Scope |
Additive manufacturing of IN718 results in significant micro-segregation of Nb, Mo and Ti due to their lower partitioning coefficient and lower diffusivity. The accumulation of these alloying elements in the inter-dendritic region results in the formation of a non-equilibrium long-chain Laves phase. APT result showed a sharp jump in Nb composition along a Laves phase, reaching the eutectic composition of stoichiometric Laves formation. To comprehend the real-time mechanism of dissolution of the Laves phase, in situ, heat treatment at 900 ̊C was carried out in a TEM. At 900 °C with a 20-minute holding period, δ –phase begins to precipitate and grows in the form of a needle shape on either side of the Laves phase into the dendrites. The formation of δ – phase at the Laves site can be considered as the intermediate stage of decomposition of the Laves phase and back diffusion of solute to the matrix. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, Solidification |