Bulk Nanocrystalline Ferrite Stabilized through Grain Boundary Carbon Segregation. Issue 10 (19th July 2018)

• Record Type: Journal Article
• Authors: Ivanisenko, Yulia; Sauvage, Xavier; Mazilkin, Andrei; Kilmametov, Askar; Beach, John A.; Straumal, Boris B.
• Is Part Of: Advanced engineering materials. Volume 20:Issue 10(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-07-19
• Subjects: atom probe tomography -- cementite -- grain boundary segregations -- nano‐crystalline steels -- severe plastic deformation; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201800443
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : Bulk nanocrystalline ferrite with a grain size below 20 nm is stabilized thanks to grain boundary segregations of carbon atoms. This structure has been obtained through severe plastic deformation of a carbon steel containing only 0.45 wt% carbon with a bainitic microstructure. Both the mean grain size and resulting strength are similar to these obtained in pearlitic steels containing twice as much carbon and deformed in the same conditions. This indicates that very high strength can be achieved in nanocrystalline steels with much lesser carbon content. Abstract : In this work, the authors using high pressure torsion demonstrated that grain size below 20 nm can be stabilized in a medium carbon C45 steel thanks to grain boundary segregations of carbon atoms. Both the mean grain size and resulting strength are similar to these obtained in pearlitic steels containing twice as much carbon and deformed in the same conditions.