Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 28, Issue 2, Pages 657-665Publisher
SPRINGER
DOI: 10.1007/s11665-018-3620-3
Keywords
Laves phase; micro-segregation; phase-field simulation; solidification microstructure
Categories
Funding
- program of ORAU Ralph E. Powe Junior Faculty Enhancement Award
- NSF [CMMI 1662854]
- Center for Advanced Vehicular Systems (CAVS) at Mississippi State University
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In this work, we apply a multi-scale model combining finite-element method (FEM) and phase-field model (PFM) to simulate the evolution of solidification microstructures at different locations within a molten pool of an additively manufactured IN718 alloy. Specifically, the FEM is used to calculate the shape of molten pool and the relative thermal gradient G at the macroscale. Then, the calculated thermal information is input into PFM for microstructure simulation. Finally, the morphology of solidification structures and formation of Laves phase at different sites are studied and compared. We found that the solidification site with a large angle between the temperature gradient and the preferred crystalline orientation could build up a high niobium (Nb) concentration in the liquid during solidification but has less possibility of forming continuous long chain morphology of Laves phase particles. This finding provides an understanding of the microstructure evolution inside the molten pool of IN718 alloy during solidification. Further, the finding indicates that the site with a large misorientation angle will have a good hot cracking resistance after solidification.
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