The Effect of Thermo-Mechanical Processing Regime on High-Temperature Tensile Properties of V-Alloyed High-Nitrogen Steel

Abstract:

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.

• Periodical: Solid State Phenomena (Volume 306)
• Pages: 53-61
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.306.53
• Online since: June 2020
• Authors: Sergey V. Astafurov*, Galina G. Maier, Eugene V. Melnikov, Valentina A. Moskvina, Marina Yu. Panchenko, Ksenya A. Reunova, Nina K. Galchenko, Elena G. Astafurova
• Keywords: Austenite, High-Temperature Deformation, Precipitate Hardening, Superplasticity, Vanadium-Alloyed High-Nitrogen Steel

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