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Effect of Process Parameters on Microstructure and Mechanical Properties of Duplex Stainless Steel Produced by Wire-Arc Additive Manufacturing

Torabi, Farnaz | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56611 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ashouri, Hossein; Movahedi, Mojtaba
  7. Abstract:
  8. Wire-arc additive manufacturing is one of the types of additive manufacturing methods that creates the desired part through layer-by-layer deposition. Heat input and interlayer temperature have an important role in this process. Duplex stainless steels have a wide range of applications due to their high corrosion resistance in chloride environments and higher strength than austenitic stainless steels. In this study, the effect of heat input (0.3 kJ/mm and 0.8 kJ/mm) and interlayer temperature (250 ºC and 40 ºC) was investigated on the macrostructure, microstructure and mechanical properties of 2209 duplex stainless steel walls that produced by gas metal arc welding based wire-arc additive manufacturing. In addition to the greater effect of heat input compared to interlayer temperature on the appearance, with the increase of heat input, the width and height of the layers were increased. Also, with the increase of the interlayer temperature, the width of the layers were increased and height of the layers were decreased. The construction time was reduced by decreasing the heat input and increasing the interlayer temperature. In general, more average austenite (18%) was observed in the microstructure with the increase of interlayer temperature, due to the decrease of the cooling rate, and vice versa. Also, increasing the heat input decreased the cooling rate and increased a small amount of austenite (4%). According to EDS results and PREN calculation, chromium loss (about 2%) was observed in all walls. Also, the average values of microhardness were decreased with the increase of heat input (2%) and interlayer temperature (10%). Flexural modulus and flexural strength values were increased with increasing austenite content (14%). The ultimate tensile strength values showed that there is anisotropy between the horizontal and vertical samples and the strength was slightly changed with the increase of heat input and interlayer temperature
  9. Keywords:
  10. Wire and Arc Additive Manufacturing ; Microstructure ; Mechanical Properties ; Duplex Stainless Steel ; Corrosion Resistance ; Metal Inert Gas (MIG)Welding ; Bending Strength

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