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Home > Oxide Inclusions in Austenitic/Lean Duplex Stainless Steels Joined by Flux-cored Arc Welding
 
Oxide Inclusions in Austenitic/Lean Duplex Stainless Steels Joined by Flux-cored Arc Welding
Paper Type
Contributed Paper
Title
Oxide Inclusions in Austenitic/Lean Duplex Stainless Steels Joined by Flux-cored Arc Welding
Author
Suphitcha Moonngam, Pranpreeya Wangjina, Ekkarut Viyanit, Namurata Sathirachinda Palsson and Chaiyasit Banjongprasert*
Email
chaiyasit.b@cmu.ac.th
Abstract:

      2101 and 2304 lean duplex stainless steels have been developed and represented as alternatives to 316/316L austenitic stainless steels. In this research, 2101 and 2304 were joined by the Flux-cored Arc Welding process (FCAW) with E2209 filler metal with different shielding gases. The oxide inclusions in the weldments under different shielding gases, which were pure CO2 and mixed (20%CO2 and 80%Ar) shielding gases were investigated in detail by the Scanning Electron Microscope (SEM), and analyzed by using Image-Pro software. The quantitative data of size distribution was analyzed by histogram distribution plots. The chemical compositions of oxide inclusions were determined by Energy Dispersive X-ray spectroscopy. Microstructures of weldjoints were observed in three different zones: base metal (BM), heat-affected zone (HAZ), and fusion zone (FZ), respectively. The oxide inclusions were detected in the fusion zone with a uniform distribution. The average diameter of oxide inclusions was 0.76±0.51µm welded under pure CO2 shielding and 0.65±0.45µm under mixed (20%CO2 and 80%Ar) shielding gases. There were no significant differences in oxide inclusion for both shielding gases. In addition, the size distribution in both shielding gases indicated normal distribution in a range of 0.479-0.714µm. The oxide inclusions were identified as the Si oxide and O-Ti-Mn-Cr type oxides, less than 1.5area% in the fusion zone. The analysis of those oxide inclusions will be discussed in details.

 

Keywords: Oxide inclusion, Size distribution, Austenitic stainless steel, Lean duplex stainless steels, Flux-cored arc welding

Start & End Page
329 - 342
Received Date
2019-09-20
Accepted Date
2020-01-21
Full Text
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Correspondence:
Author Name
Chaiyasit Banjongprasert* - Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, 239 Huay Keaw Road, Chiang Mai, 50200, Thailand.
Keyword:
Keyword
oxide inclusion, size distribution, austenitic stainless steel, lean duplex stainless steels, flux-cored arc welding,
Volume
Vol.47 No.2 (Special Issue I : March 2020)
 




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