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316L Austenite Stainless Steels Strengthened by Means of Nano-scale Twins

G.Z. Liu N.R. Tao K. Lu

材料科学技术(英文)

By means of dynamic plastic deformation (DPD) followed by thermal annealing, a mixed structure of micro-sized austenite grains embedded with nano-scale twin bundles (of about 20% in volume) has been synthesized in a 316L stainless steel (SS). Such a 316L SS sample exhibits a tensile strength as high as 1001 MPa and an elongation-to-failure of about 23%. The much elevated strength originates from the presence of a considerable number of strengthening nano-twin bundles, while the ductility from the recrystallized grains. The superior strength-ductility combination achieved in the nano-twins-strengthened austenite steel demonstrates a novel approach for optimizing the mechanical properties in engineering materials.

关键词: Nano-scale twins , Strength-ductility combination , Dynamic plastic deformation (DPD) , Stainless steels

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