| Autor: |
Prabu, S. Senthur, Muthu, S. M., Sujai, S., Ramkumar, K. Devendranath, Beemkumar, N., Kariappan, Elangovan |
| Předmět: |
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| Zdroj: |
Journal of Materials Engineering & Performance; Dec2023, Vol. 32 Issue 24, p11024-11039, 16p |
| Abstrakt: |
This research investigates the hot corrosion behavior of Inconel 625 similar joints welded using pulsed current gas tungsten arc welding (PCGTAW). Specific emphasis has been given to the microstructural changes at the fusion zone and weld interface while employing two different Ni-Mo-rich fillers (ERNiCrCoMo-1 and ERNiCrMo-4). The microstructure of the weldments was evaluated using scanning electron microscopy (SEM) and optical microscopy (OM) techniques. The weld joints employed with ERNiCrMo-4 filler showed slightly higher strength than that of ERNiCrCoMo-1, and the fractures were found on the base metal regions. The performance of the alloy 625 bi-metallic joints has been ascertained by exposing both cyclic molten salt K2SO4 + 60% NaCl and an air oxidation environment at 700 °C. A thermogravimetric plot was employed to determine the weldment kinetics of corrosion. SEM/EDS systematically examined the oxide scales formed on the weldments, and x-ray diffraction (XRD) was used to identify the phases of the corrosion products. The test results revealed that the corroded samples in the salt condition experienced severe corrosion attacks as compared to air conditions by sulfidation and chlorination. Based on the specific outcomes of this study, ERNiCrMo-4 filler is recommended for joining these similar combinations of welds and it imparts better corrosion resistance at elevated temperatures in simulated boiler environments. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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