Distribution of Dislocations in Nanostructured Bainite

Abstract:

The dislocation density in ferrite and austenite of a bainitic microstructure obtained by transformation at very low temperature (300 °C) has been determined using transmission electron microscopy. Observations revealed that bainitic ferrite plates consist of two distinctive regions with different substructures. A central region in the ferrite plate is observed with dislocations that may result from lattice-invariant deformation at the earlier stage of bainite growth. As plastic deformation occurs in the surrounding austenite to accommodate the transformation strain as growth progresses, the Ferrite/Austenite interface has also a very distinctive dislocation profile. In addition, atom-probe tomography suggested that dislocation tangles observed in the vicinity of the ferrite/austenite interface might trap higher amount of carbon than single dislocations inside the bainitic ferrite plate.

• Periodical: Solid State Phenomena (Volumes 172-174)
• Pages: 117-122
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.172-174.117
• Online since: June 2011
• Authors: J. Cornide, Goro Miyamoto, Francisca G. Caballero, Tadashi Furuhara, Michael K. Miller, Carlos Garcia-Mateo
• Keywords: Atom Probe Tomography (APT), Bainite, Dislocation Density, Steel, TEM

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