Microstructural Development and Deformation Mechanisms during Cold Rolling of a Medium Stacking Fault Energy TWIP Steel

doi:10.1016/j.jmst.2012.11.002

J. Mater. Sci. Technol. ›› 2013, Vol. 29 ›› Issue (2): 161-167.DOI: 10.1016/j.jmst.2012.11.002

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Microstructural Development and Deformation Mechanisms during Cold Rolling of a Medium Stacking Fault Energy TWIP Steel

K.A. Ofei^1,2), L. Zhao^1,2), J. Sietsma²⁾

1) Materials Innovation Institute M2i, Mekelweg 2, 2628 CD Delft, The Netherlands
2) Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands

Received:2012-01-11 Revised:2012-06-20 Online:2013-02-28 Published:2013-03-01
Contact: K.A. Ofei
Supported by:
MC41.508312 in the framework of the Research program of the Materials Innovation Institute (M2i) (www.m2i.nl).

Abstract

Abstract:

The magnetic response, microstructural and texture changes occurring during cold rolling of aFe-14Mn-0.64C-2.4Al-0.25Si medium stacking fault energy TWIP (twinning induced plasticity) steel have been studied by X-ray diffraction and magnetic techniques. The changes in the sub-grain size (D_s), probability of stacking fault formation (P_sf) and microstrain in the material as cold rolling progressed were determined by using a modified version of the Williamson and Hall equation. A strong development of the crystallographic texture with increasing deformation was observed. Deformation-induced formation of a small fraction α’-martensite was observed, indicating that the steel also exhibits γ’ →α’-martensite transformation during cold rolling, which is discussed via the changes of the stacking-fault probability and the texture development during cold rolling.

Key words: α’-Martensite, Sub-grain size, Probability of stacking fault formation, Texture development

K.A. Ofei, L. Zhao, J. Sietsma. Microstructural Development and Deformation Mechanisms during Cold Rolling of a Medium Stacking Fault Energy TWIP Steel[J]. J. Mater. Sci. Technol., 2013, 29(2): 161-167.

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Microstructural Development and Deformation Mechanisms during Cold Rolling of a Medium Stacking Fault Energy TWIP Steel

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