Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 44A, Issue 2, Pages 911-922Publisher
SPRINGER
DOI: 10.1007/s11661-012-1543-4
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Funding
- Deutsche Forschungsgemeinschaft (DFG) within the Collaborative Research Centre [(SFB) 761]
- Alexander von Humboldt Foundation
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In the present study, microstructure and texture evolution in an austenitic Fe-28 wt pct Mn-0.28 wt pct C TWIP steel in the range between 10 and 80 pct reduction by cold rolling were systematically analyzed. The formation of the observed microstructural features occurred in three different stages: I (10 to 20 pct)-mainly slip lines, grain elongation, and formation of few twin-matrix lamellae; II (30 to 50 pct)-severe increase of the volume fraction of twins, alignment of twins with the rolling plane, and formation of microshear bands; and III (60 to 80 pct)-further alignment of twins, evolution of a herring bone structure, and macroshear bands. In contrast to most f.c.c. metals, the transition from Copper- to Brass-type texture occurred at low strain levels (30 pct). This behavior is attributed to the early formation of deformation twins in the material and can be related to the SFE of this high manganese steel. At higher reduction levels, microscopic (a parts per thousand yen40 pct) and macroscopic shear band formation (a parts per thousand yen60 pct) contributed to the increase of randomly oriented grains, mainly at the expense of the Brass component. Furthermore, the formation of the Goss component and of the aOE (c) 111 >//ND fiber (gamma) is attributed to severe twin formation.
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