Effect of submicron-grain structure on the mechanical properties of low-carbon steels
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Rolling at temperatures above the recrystallization temperature with high levels of rolling makes it possible to obtain in low-carbon steels an improved submicron-grain structure with low dislocation density and a grain size of 0.8 μm, and at a temperature below the recrystallization temperature it leads to an incomplete submicron-grain structure with high defect density and a grain size of 0.7 μm.
Preparation of a submicron-grain structure is a promising method for strengthening steels of the 03KhGSF and 20GSF type. After treatment by the schedule II suggested the strength of steels 20GSF and 03KhGSF increases by a factor of two to three compared with the hot-rolled condition: σ0.2 =895 and 935 N/mm2, σ2 respectively. Ductility characteristics are retained to quite a high level, and the impact strength at ttest=−196°C increases by a factor of ten.
KeywordsGrain Size Mechanical Property Recrystallization Ductility Dislocation Density
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