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Production of 316 L Steel Alloy Powder by Thermal Spraying Method for Selective Laser Melting Additive Manufacturing Process

Feizollahi, Safoura | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56633 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnejad, Khatib al-Islam
  7. Abstract:
  8. Powder production for additive manufacturing processes is one of the daily challenges of researchers. The aim of this research is to produce 316 L stainless steel powder using a new flame spraying method. Flame spraying is the oldest thermal spraying process, which has always been of interest due to its high efficiency and relatively low side costs. 316 L stainless steel wire with a diameter of 3 mm was used to produce the powder; The input material was entered at a temperature of 01°C and was melted with the help of acetylene and oxygen flame and sprayed as a powder, the powder production rate was kg/h0. To collect the produced powder, a cylindrical tank with a diameter of 01 cm and a length of 101 cm was designed and argon gas with a purity of 000005 was used to control the environmental conditions. Three powder samples were produced in neutral, oxidizing and reducing conditions using 01:00, 32:00 and 01:32 Lit/min input flow rates of acetylene gas and oxygen. After cooling, the powder was collected and subjected to various analyses. The average degree of sphericity for each of the redox, oxide and neutral powders was 2001, 2000 and 2001, respectively, and also the particle size distribution of the powders produced with all three types of flame after sieving with 032 mesh, in the range of 61 μm It was 11. By changing the type of flame from oxide and reduction to neutral, the amount of surface oxygen was 040115, 030045 and 13045 atomic, and less surface porosities were created in the neutral state. According to XRF analysis, the total oxygen content of the powder was 66065 with neutral flame, and there was no significant change in the three conditions. The flowability of the powder with neutral flame was 0006 and the apparent density was 3006, and the average internal porosity of the powder produced with neutral flame was calculated to be 0043 μm. The results showed that the powder produced by the flame spraying method can be used for the selective laser melting process
  9. Keywords:
  10. Flame Spray ; 316 Austenitic Stainless Steel ; Powder Production ; Selective Laser Melting (SLM) ; Additive Manufacturing

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