Effect of root pass filler metal on microstructure and mechanical properties in the multi-pass welding of duplex stainless steels
Autor: | Ahmed Kellai, Azzedine Lounis, Sami Kahla, Brahim Idir |
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Rok vydání: | 2017 |
Předmět: |
Austenite
0209 industrial biotechnology Toughness Filler metal Materials science Mechanical Engineering Alloy 02 engineering and technology Welding engineering.material 021001 nanoscience & nanotechnology Microstructure Industrial and Manufacturing Engineering Computer Science Applications law.invention Corrosion 020901 industrial engineering & automation Optical microscope Control and Systems Engineering law engineering Composite material 0210 nano-technology Software |
Zdroj: | The International Journal of Advanced Manufacturing Technology. 95:3215-3225 |
ISSN: | 1433-3015 0268-3768 |
Popis: | This paper is focused on the estimation of the effect of root pass chemical composition, in multi-pass GTA Weldments, on microstructure and mechanical properties of duplex stainless steel welds. We used two different filler metals, the super duplex ER 2594 and duplex ER 2209. Microstructures of different passes of welded joints are investigated using optical microscope and scanning electron microscope. The relationship between mechanical properties, corrosion resistance, and microstructure of welded joints is evaluated. It is found that the tensile and toughness properties of the first weldment, employing the combination of ER 2594 in the root pass and ER 2209 in the remaining, are better than that of the second weldment employing ER 2209 all passes, due to the root pass grains refinement and its alloy elements content as chromium Cr and nitrogen N. The microstructure indicates the presence of austenite in different forms on the weld zone of ER 2209, same in the case of ER 2594, but with higher content and finer grains size, in particular Widmanstatten austenite WA. Potentiodynamic polarization tests of the first weld metal evaluated in 3.5% NaCl solution at room temperature have been demonstrated a corrosion resistance higher than that of the second weld metal. This work addressed the improvement of the corrosion resistance using appropriate filler metal without getting any structural heterogeneity and detrimental changes in the mechanical properties. |
Databáze: | OpenAIRE |
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