New Class of Steel
Targeted Mixed Microconstituent Structure in NanoSteel AHSS
The “Mixed Microconstituent Structure” is what enables NanoSteel’s sheet to exhibit 3rd generation AHSS properties and account for the limitations of any single structure to overcome the paradoxical relationship between strength and ductility. This unique structure is made up of two distinct characteristic microconstituents that act synergistically during deformation.
The first component of this structure, Microconstituent A, is made up of micron-sized austenitic grains with dislocation networks and nanoprecipitates. This constituent, with its larger grain sizes, mainly supports high ductility during deformation with strengthening through nanoprecipitation.
The second component, Microconstituent B, consists of nanoscale ferritic grains with nanoprecipitates which form during deformation. This component of the structure provides strength due to the combination of nanoscale grain formation and nanoprecipitation. The transformed ferrite combined with the austenite also contributes to ductility.
The complete microstructural pathway of this new sheet steel alloy—from as-cast to the final Mixed Microconstituent structure—occurs through typical commercial sheet steel processing steps and does not require the any special methods such as rapid solidification or quenching.