High-functionalization of Mechanical Property in Carbon Steels by Giant Straining

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In the submicrocrystalline ultra-low carbon steel without special alloy-elements produced by HPT (High-Pressure Torsion) straining which is one of the severe plastic deformation processes, mechanical properties were investigated. In the tensile property, the engineering tensile strength was 1.9 GPa, which is similar to the value of maraging high-alloy steels. The elongation increased with strain, is caused by the reduction of the stress concentration due to the existence of continuously recrystallized grains. Hydrogen embrittlement (HE) occurred in the specimen with the high tensile strength of 1.9 GPa. However, its HE was suppressed via recovery process by annealing at low temperature while maintaining the high strength.