Effect of nitrogen on short-range atomic order in the feritic δ phase of a duplex steel
| Autor: | V. Gavriljuk, Michael Pohl, E. Polshin, M. Mola, T. Bliznuk |
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| Rok vydání: | 2005 |
| Předmět: |
Austenite
Materials science Mössbauer effect Mechanical Engineering Metallurgy Beta ferrite Analytical chemistry chemistry.chemical_element Condensed Matter Physics Nitrogen chemistry Mechanics of Materials Conversion electron mössbauer spectroscopy Ferrite (iron) Mössbauer spectroscopy General Materials Science Embrittlement |
| Zdroj: | Materials Science and Engineering: A. 405:11-17 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2005.05.094 |
| Popis: | The short-range atomic order in the δ-ferrite of three duplex steels SAF2205, SAF2507 and D2, containing 0.17, 0.25 and 0.62 wt.% N, respectively, was studied using conversion electron Mossbauer spectroscopy and internal friction and characterized in terms of the Cowley parameter α. It was established that an increase in the N content from 0.17 to 0.25% assists short-range atomic ordering of Cr and Mo atoms in the ferrite, i.e. prevalence of the Cr–Fe and Mo–Fe nearest neighbourhood. In contrast, clustering of Ni atoms is increased. Alloying with 0.62% N leads to clustering of Cr and Mo atoms and weakens clustering of Ni atoms. Measurements of the Snoek relaxation in the ferrite showed that, with increasing total N content, its concentration in the ferrite also increases, although most of the nitrogen is located in austenite. According to measurements of the Zener relaxation, the fraction of Cr(Mo)–Cr(Mo) pairs in the ferrite decreases with increasing N content, which can be attributed to formation of more complicated complexes of nitride-forming substitutional atoms with nitrogen atoms. |
| Databáze: | OpenAIRE |
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