|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location Specific, Processing-Microstructure-Property-Relationships III
||A-16: Microstructural Investigation of Inconel 625 – Inconel 738 Functionally Graded Material Fabricated by Laser Metal Deposition
||Abhishek Ramakrishnan, Chaitanya Amilkanthwar, Arpit Sethi, Guru Prasad Dinda
|On-Site Speaker (Planned)
Functionally greeted Inconel 625 – Inconel 738 material was deposited using direct laser metal deposition (LMD) technique. A comprehensive microstructural investigation using SEM and X-Ray diffraction techniques revealed a unique microstructural morphology containing gamma/gamma-prime microstructure with three distinct regions of gamma-prime (Ni3(Al,Ti)) particle size across each dendrite. The very high cooling rate of LMD process developed gradient composition due to the coring effect during rapid solidification. The amount of Al and Ti gradually increased from center to outer edge of each dendrite. Consequently, gamma-prime particle size gradually increased from about 20 nm at the center to about 60 nm at the outer edge of dendrite corresponding to an alloy mixture of 50% Inconel 625 and 50% Inconel 738. Additionally, the gamma-prime particle size progressively increased with the increase of Inconel 738 in the gradient alloy. This result will expedite the development of novel Ni-base superalloy for specific additive manufacturing applications.
||Planned: Supplemental Proceedings volume