Thermodynamic Simulation of Niobium-Containing Austenitic Stainless Steels: Microstructure and Corrosion Properties
| Autor: | A. Chandrasekar, K. Krishna Kumar, J. Anburaj, Ramanathan Subramanian, T. K. Satish Kumar |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Austenite Materials science Alloy Metallurgy 0211 other engineering and technologies Niobium chemistry.chemical_element 02 engineering and technology engineering.material Microstructure 01 natural sciences Corrosion Dielectric spectroscopy chemistry.chemical_compound chemistry 0103 physical sciences engineering Niobium carbide Grain boundary 021102 mining & metallurgy |
| Zdroj: | Transactions of the Indian Institute of Metals. 72:1627-1630 |
| ISSN: | 0975-1645 0972-2815 |
| Popis: | In the present work, as cast niobium (Nb) alloyed (0.66 wt%, 1 wt% and 1.75 wt% of Nb) austenitic stainless steels were solution annealed and sensitized at 550 °C, 650 °C and 750 °C for a period of 12 h. Niobium carbide (NbC) precipitation behavior was simulated using ThermoCalc-PRISMA. The microstructural features were studied by SEM. Corrosion properties were analyzed by double-loop electrochemical potentiokinetic reactivation test and electrochemical impedance spectroscopy. Results showed that the nucleation rate and volume fraction of NbC precipitates at grain boundaries (GBs) in 1.75%Nb alloy were higher than other two alloys. The 1.75%Nb alloy was found to have a lower degree of sensitization compared to other two alloys due to formation of NbC at GBs. The corrosion behavior of alloys in the sensitized conditions was in total contrast to that of solution-annealed condition. |
| Databáze: | OpenAIRE |
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