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|Oxide Inclusions in Austenitic/Lean Duplex Stainless Steels Joined by Flux-cored Arc Welding
Namurata Sathirachinda Palsson
Namurata Sathirachinda Palsson
|Oxide inclusion;Size distribution;Austenitic stainless steel;Lean duplex stainless steels;Flux-cored arc welding
|Faculty of Science, Chiang Mai University
|Chiang Mai Journal of Science 47,2 (March 2020), p.329 - 342
|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.
|The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so.
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|CMUL: Journal Articles
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