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Characterization of Ss316l Powder Produced by Flame Spraying Method for Additive Manufacturing by Selective Laser Melting by Changing Machine Parameters

Yousefi, Dorsa | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56342 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnezhaad, Khatiboleslam
  7. Abstract:
  8. Selective Laser Melting (SLM) process is a powder-based metal Additive Manufacturing (AM) technique. This developing industry has many advantages like generation of geometrically complex shapes with high density. High Cost, production and characterization of powders, limited material choices and process parameters optimization are some of the challenges associated with SLM. Stainless steel 316L due to its unique properties, like corrosion resistance, high strength, biocompatibility, availability and cost is indeed a commonly used material in SLM. In this research, the characterization of the powder produced by the flame spraying device, which is a new method, was discussed. Wire with 3mm diameter is fed into the flame at a controlled rate. As the feedstock material enters the flame, it is rapidly heated and melted. The heat causes the material to atomize, forming small molten droplets. Flame-sprayed powders are collected with the help of a designed tank. Powder's circularity factor was 0.84, particle size distribution 15-65 µm, apparent density 3.96 gr.cm-3 and powder flowability 22.6 s.50gr-1 were obtained and its results were compared with gas-atomized powders. To evaluate the printability of flame-sprayed powders and find the optimal process parameters, 9 samples were made with the help of experimental design by changing the laser power and scanning speed and compared with a control sample. The build part’s relative density was between 93.75-97.65%, hardness 212-260 HV and 10-25 µm surface roughness. The internal defects and the influence of the process parameters were investigated and finally the best sample was reported
  9. Keywords:
  10. Additive Manufacturing ; Selective Laser Melting (SLM) ; Flame Spray ; 316 Austenitic Stainless Steel

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