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2.2 GPa ultra-strong nanostructured steel with unexpected large ductility

AutorMingxin HUANG
Palabras clavenovel steel
Fecha de publicación27-may-2016
ResumenFor centuries, the quest for achieving high performance bulk metals and alloys for structural applications has been perplexed by the notorious trade-off between strength and ductility. Here we report a conceptually novel strategy to resolve this dilemma by incorporating all available strengthening and plasticity mechanisms at multiple length scales. This approach is a paradigm shift in structural alloy design and offers a steel with a yield strength of 2.2 GPa and an unexpected tensile uniform elongation of 16%. To our best knowledge, this steel stands the best bulk metallic alloys so far in terms of yield strength-uniform elongation combination. More importantly, this steel was produced using conventional thermal mechanical processing routes (i.e. rolling and annealing), which will facilitate its future industrial mass production and applications in a wide spectrum of industrial settings. The present novel steel possesses a dual-phase hierarchical nanostructure consisting of nanosized precipitates, nanotwins, and lamellar nano- and ultrafine-grained austenite and ferrite. This novel steel has been strengthened by all the available strengthening mechanisms, including solid-solution, precipitation, dislocations, grain boundary and twin boundary strengthening. Besides dislocation plasticity, the novel steel also experiences transformation-induced plasticity (TRIP) as well as twinning-induced plasticity (TWIP). More importantly, different to other lab-scale methods of producing ultrahigh strength alloys, such as the severe plasticity deformation (SPD) technique, the present novel steel has been produced by conventional processing routes currenlty used in the steel industry. No additional facilities are required for the steel industry to produce this novel steel, which will facilitate its future industrial application.
DescripciónConferencia del Programa Embajadores del CENIM
Aparece en las colecciones: (CENIM) Cursos-Material didáctico
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