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Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes

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Simulation of TTT Curves for Additively Manufactured Inconel 625.

G Lindwall^1,2, C E Campbell³, E A Lass³

¹Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899.

Metallurgical and Materials Transactions. A. Physical Metallurgy and Materials Science

|December 1, 2022

Summary

This summary is machine-generated.

Computational tools accurately predict microstructure evolution in additively manufactured Inconel 625 (IN625). Simulations show increased segregation accelerates undesirable delta-phase precipitation, guiding optimized heat treatments for AM materials.

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Area of Science:

Materials Science
Computational Materials Science
Metallurgy

Background:

Additive manufacturing (AM) of Inconel 625 (IN625) presents unique microstructure evolution challenges.
Laser powder-bed fusion (LPBF) can lead to compositional segregation during solidification.
Understanding and controlling phase precipitation is critical for AM material performance.

Purpose of the Study:

To evaluate the efficacy of computational thermodynamic and kinetic tools for studying microstructure evolution in AM IN625.
To correlate segregation levels with delta-phase (Ni3Nb) precipitation kinetics.
To validate simulation results against experimental data for optimizing post-build heat treatments.

Main Methods:

Utilized common computational thermodynamic and kinetic tools for simulation.
Performed solidification simulations to identify interdendritic segregation.
Conducted precipitation simulations under varying segregation conditions.
Generated and compared Time-Temperature-Transformation (TTT) diagrams from simulations and experiments.

Main Results:

Solidification simulations revealed highly segregated interdendritic regions due to laser melting and re-melting.
Precipitation simulations indicated that greater segregation (richer in Nb and Mo) accelerates delta-phase precipitation.
Simulated TTT diagrams showed good agreement with experimental data.
The study confirmed accelerated delta-phase precipitation in AM IN625 compared to wrought IN625.

Conclusions:

Computational tools are effective for studying microstructure evolution in AM IN625.
Segregation significantly influences delta-phase precipitation kinetics.
Simulations can guide and optimize post-build heat treatments for AM materials to mitigate undesirable phase formation and improve properties.