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Grain boundary segregation in Fe-Mn-C twinning-induced plasticity steels studied by correlative electron backscatter diffraction and atom probe tomography

Herbig,M, Kuzmina,M, Haase,C, Marceau,RKW, Gutierrez-Urrutia,I, Haley,D, Molodov,DA, Choi,P and Raabe,D 2014, Grain boundary segregation in Fe-Mn-C twinning-induced plasticity steels studied by correlative electron backscatter diffraction and atom probe tomography, Acta Materialia, vol. 83, pp. 37-47, doi: 10.1016/j.actamat.2014.09.041.

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Title Grain boundary segregation in Fe-Mn-C twinning-induced plasticity steels studied by correlative electron backscatter diffraction and atom probe tomography
Author(s) Herbig,M
Kuzmina,M
Haase,C
Marceau,RKWORCID iD for Marceau,RKW orcid.org/0000-0003-3612-8762
Gutierrez-Urrutia,I
Haley,D
Molodov,DA
Choi,P
Raabe,D
Journal name Acta Materialia
Volume number 83
Start page 37
End page 47
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2014-01
ISSN 1359-6454
Keyword(s) Atom probe tomography
Austenite
Electron backscatter diffraction
Grain boundary segregation
Twin grain boundary
Summary We report on the characterization of grain boundary (GB) segregation in an Fe-28Mn-0.3C (wt.%) twinning-induced plasticity (TWIP) steel. After recrystallization of this steel for 24 h at 700 °C, ∼50% general grain boundaries (GBs) and ∼35% Σ3 annealing twin boundaries were observed (others were high-order Σ and low-angle GBs). The segregation of B, C and P and traces of Si and Cu were detected at the general GB by atom probe tomography (APT) and quantified using ladder diagrams. In the case of the Σ3 coherent annealing twin, it was necessary to first locate the position of the boundary by density analysis of the atom probe data, then small amounts of B, Si and P segregation and, surprisingly, depletion of C were detected. The concentration of Mn was constant across the interface for both boundary types. The depletion of C at the annealing twin is explained by a local change in the stacking sequence at the boundary, creating a local hexagonal close-packed structure with low C solubility. This finding raises the question of whether segregation/depletion also occurs at Σ3 deformation twin boundaries in high-Mn TWIP steels. Consequently, a previously published APT dataset of the Fe-22Mn-0.6C alloy system, containing a high density of deformation twins due to 30% tensile deformation at room temperature, was reinvestigated using the same analysis routine as for the annealing twin. Although crystallographically identical to the annealing twin, no evidence of segregation or depletion was found at the deformation twins, owing to the lack of mobility of solutes during twin formation at room temperature.
Language eng
DOI 10.1016/j.actamat.2014.09.041
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30068826

Document type: Journal Article
Collection: Institute for Frontier Materials
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