The Effect of Thermo-Mechanical Processing Regime on High-Temperature Tensile Properties of V-Alloyed High-Nitrogen Steel
| Autor: | Eugene Melnikov, Marina Yu. Panchenko, K. A. Reunova, Galina G. Maier, N. K. Galchenko, Valentina Moskvina, Sergey V. Astafurov, Elena G. Astafurova |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0103 physical sciences High nitrogen Ultimate tensile strength General Materials Science Composite material 0210 nano-technology Thermo mechanical |
| Zdroj: | Solid State Phenomena. 306:53-61 |
| ISSN: | 1662-9779 |
| DOI: | 10.4028/www.scientific.net/ssp.306.53 |
| Popis: | The paper is devoted to an experimental investigation of a high-temperature deformation in V-alloyed high-nitrogen austenitic Fe-19Cr-22Mn-1.5V-0.3C-0.6N steel processed via different thermo-mechanical treatments. Simple thermo-mechanical processing regimes (cold rolling or rolling with single post-deformation anneal) do not allow to realize a substantial elongation in high-nitrogen steel during high-temperature tensile tests. For fine-grained austenitic structure with an average grain size of 3 µm, the maximal value of elongation to failure of 150% was realized at temperature 950 °C. Using a multi-stage thermo-mechanical treatment included cold rolling and intermediate anneals, a heterophase grain/subgrain structure with high density of deformation-induced defects and precipitates was produced. When heated to a deformation temperature, this deformation-assisted microstructure recrystallizes into a stable fine-grained structure and demonstrates the attributes of superplastic flow (values of elongation to failure higher than 400%) in the temperature range of 850-1000 °C. The maximum elongation of 900% is achieved at temperature of 950 °C and an initial strain rate of 10-4 s-1. |
| Databáze: | OpenAIRE |
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