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Solidification Simulation During Direct Metal Deposition of Functionally Graded Material

Rahmanizadeh, Shayan | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55564 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Akbari, Javad; Tavakoli, Roholla
  7. Abstract:
  8. Additive manufacturing can be considered as a revolution in the manufacturing industry. The unique capabilities of this technology have led to the removal of many obstacles to the construction of complex and special parts. In this study, with the aim of further understanding how the gradient region is formed, the possibility of detecting the microstructure and finally the properties of the gradient piece made, a solidification process has been simulated in direct metal deposition. The results of this study include calculating the heat distribution during the process and obtaining a thermal history of the fabricated part, calculating the dimensions of the molten pool and the heat affected area, calculating the thermal gradient and cooling rate in the solidification process. So, the equations of conservation of energy, momentum and mass have been solved in two dimensions. The equations are discretized using the finite volume method and due to the dependence of the thermophysical properties of the material on temperature, the equations are solved by implicit methods. As a result, the system of equations obtained from this implicit method must be solved with iterative methods. Laser attenuation in interaction with the powder flow and the fluid flow in the molten pool are also considered. The final result of this research is having a comprehensive model of the process of making functionally graded materials made with the help of direct metal deposition
  9. Keywords:
  10. Finite Volume Method ; Additive Manufacturing ; Direct Metal Deposition ; Solidification ; Navier-Stokes Equation ; Functionally Graded Materials (FGM) ; Thermal History ; Laser Directed Energy Deposition (LDED)

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