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An ultra-high strength steel sheet with a tensile strength over 1500MPa and excellent low-temperature impact toughness was obtained by either using controlled rolling plus air cooling (CR+AC) or laboratorial thermo-mechanical controlled processing (TMCP). The effects of CR+AC and the TMCP processes were then examined on the microstructures and mechanical properties of this steel sheet. The results...
A high manganese austenitic steel Fe-25Mn-3Cr-3Al-0.3C-0.01N (in wt. pct) with grain sizes 2.2∼28.7μm was obtained by annealing the cold rolled sheet at temperature ranging from 700°C to 1000°C. Dependence of grain size on the mechanical properties and microstructures of this high manganese steel were studied by using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and room...
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