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Investigation of the Effect of Additive Manufacturing Process Parameters on the Geometry of Components Made of Inconel 625 by Direct Metal Deposition

Nankali, Mobin | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52797 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Akbary, Javad; Moradi, Mahmoud
  7. Abstract:
  8. Additive manufacturing technology (AM) is one of the new methods of rapid prototyping. Experts claim that using this process can produce a prototype of the product with any complex geometry in the shortest possible time. Among the methods of metal additive fabrication, the direct metal layering method with the powder coaxial nozzle has different capabilities and has received much attention by researchers. In this research, we intend to find a relationship between device parameters and the geometry of samples made by direct metal layer method. According to the research, many parameters affect the quality of the samples made by this method, the most effective of which are the three parameters of laser power, laser beam diameter, speed of movement of the table and the overlap percentage. In this study, we designed two experiments to investigate the effect of each of the mentioned parameters on the properties of components made of Inconel 625. In the first experiment, the walls were constructed by fabricating eight specimens consisting of 5 layers, and the effects of laser power parameters, focal diameter and speed of table movement on height, width and surface area of each were investigated. In the experiment two three samples consisting of three layers with different overlap percentage were made and the effect of overlap percentage was investigated. The results of the first experiment show that laser power and laser beam diameter have a direct relationship with the thickness and smoothness of the surface of the walls, and the speed of movement of the table is inversely related to the height, width and flatness of the surface. The results of the second experiment show that for the low overlap percentages the layers are completely overlapping and not adhering to the substrate, and with increasing layer overlap percentage, the samples have high porosity
  9. Keywords:
  10. Physical Properties ; Additive Manufacturing ; Rapid Prototyping ; Three Dimentional Metal Printers ; Direct Metal Deposition ; Components Geometry ; Inconel 625 Superalloy

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