Effect of Aging on the Corrosion Resistance of 2209 Duplex Stainless Steel Weldments
| Autor: | Hae Woo Lee, Donghoon Kang, Nohoon Kim |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Austenite
Microstructural evolution Materials science Precipitation (chemistry) 020502 materials Metallurgy Metals and Alloys 02 engineering and technology Condensed Matter Physics Microstructure Corrosion chemistry.chemical_compound 0205 materials engineering chemistry Mechanics of Materials Duplex (building) Materials Chemistry Pitting corrosion Chromium nitride |
| Zdroj: | Metals and Materials International. 25:740-750 |
| ISSN: | 2005-4149 1598-9623 |
| Popis: | In this study, we investigated the correlation between the microstructure and the localized corrosion characteristics for a weld metal made up of 22Cr-9Ni duplex stainless steel (DSS) aged in the range of 400–1000 °C for 30 min. The results showed that changes in the microstructure of the DSS weldments, owing to the formation of precipitates during the aging process, affected its pitting corrosion resistance. The microstructural evolution was found to be extremely sensitive to the secondary phase precipitations such as chi (χ), sigma (σ), chromium nitride (Cr2N), and secondary austenite (γ2) in the aging range of 700–900 °C. The potentiodynamic polarization tests confirmed that the pitting potential representing the corrosion resistance decreased gradually from 500 °C, attained the lowest at 850 °C, and increased again at 900 °C. In addition, the Cr or Mo deficient area around σ phase was transformed into the secondary austenite (γ2) phase during aging where the pitting was found to occur. |
| Databáze: | OpenAIRE |
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