Martensitic phase transformation and deformation behavior of Fe-Mn-C-Al twinning-induced plasticity steel during high-pressure torsion

Kun Yan, Dhriti Bhattacharyya, Qi Lian, Saurabh Kabra, Megumi Kawasaki, David G. Carr, Mark D. Callaghan, Maxim Avdeev, Huijun Li, Yanbo Wang, Xiaozhou Liao, Terence G. Langdon, Klaus Dieter Liss, Rian J. Dippenaar

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The transformation between the face centered cubic austenitic and hexagonal close-packed martensitic phases during high-pressure torsion processing was observed in a Fe-Mn-C-Al twinning-induced plasticity steel. This phase transformation was not found in the same material processed by unidirectional compressive and tensile deformation. Initiated by the high-pressure loading, the martensite phase initially increased with torsional strain but diminished subsequently. Texture evolution of the austenitic phase was compared with the ideal texture distribution of face-centered cubic materials after shear deformation. High pressure torsion of TWIP steel shows the formation of an HCP Martensite phase, whose volume fraction first increases, then decreases with increasing strain, as shown by local synchrotron diffraction at various points along the radius of the sample, and neutron diffraction on samples with increasing number of turns. Local texture analysis shows the correlation between position and predominant deformation mechanism.

Original languageEnglish
Pages (from-to)927-932
Number of pages6
JournalAdvanced Engineering Materials
Volume16
Issue number7
DOIs
StatePublished - Jul 2014
Externally publishedYes

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