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Published on: March 13, 2018
Ultrasonic-induced nucleation kinetics in directed energy deposition
Lichao Zhang1, Zelong Yu1, Jingyuan Chen1
1State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, School of Mechanics and Aerospace Engineering, Dalian University of Technology, Dalian 116024, China.
Ultrasonics
|July 6, 2026
Summary
Ultrasonic vibrations in ultrasonics assisted directed energy deposition (UADED) significantly enhance nucleation kinetics. This leads to finer grain structures, improving microstructure control in additive manufacturing.
Area of Science:
- Materials Science
- Mechanical Engineering
- Additive Manufacturing
Background:
- Nucleation kinetics in ultrasonics assisted directed energy deposition (UADED) are not well understood.
- Controlling microstructures in UADED is crucial for material properties.
Purpose of the Study:
- To establish a new nucleation kinetics model for UADED.
- To clarify the relationship between ultrasonic features and microstructural evolution.
Main Methods:
- Incorporated ultrasonic volume force and heat enhancement terms into a heat-flow-microstructure coupling model.
- Developed a novel nucleation kinetics model (NKT).
Main Results:
- Ultrasonic vibrations increased heat input by 27.3 W/m³ and flow velocity by 43.3%.
- Thermal undercooling increased by 40.7 K, boosting nucleation rate by 68.6%.
- Average grain size decreased from 220 μm to 130 μm.
Conclusions:
- The proposed NKT accurately models nucleation kinetics in UADED.
- Ultrasonic assistance enables enhanced microstructure control in additive manufacturing.
