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Metals 2018, 8(4), 262; https://doi.org/10.3390/met8040262

Temperature Dependence of the Microstructure and Mechanical Properties of a Twinning-Induced Plasticity Steel

1
Departamento de Ingeniería Metalúrgica y de Materiales, Universidad Técnica Federico Santa María, Valparaíso 2340000, Chile
2
Departamento de Ingeniería Metalúrgica, Universidad de Santiago de Chile, Santiago 9160000, Chile
3
Grupo Mecánica de Fractura, UNComa-CONICET, Neuquén 8300, Argentina
*
Author to whom correspondence should be addressed.
Received: 26 January 2018 / Revised: 22 March 2018 / Accepted: 29 March 2018 / Published: 12 April 2018
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Abstract

The objective of the present study is to analyze the microstructure and mechanical properties of a twinning-induced plasticity (TWIP) steel at different temperatures. For this purpose, tensile tests were performed on a Fe-22Mn-0.65C TWIP steel in a temperature range between 25 °C and 400 °C. The microstructure after deformation was characterized via optical microscopy. It was observed that the microstructure consists of mainly deformation twins at low temperatures, whereas dislocation bands are the predominating feature at high temperatures. The analysis of mechanical data suggests a transition of the deformation mechanism from twinning at low temperatures to dislocation slip at high temperatures. The work-hardening rate and area reduction variation with temperature are discussed and correlated to the decrease of twinning contribution to the deformation mechanism. The role of other processes, such as dynamic strain aging and precipitation hardening, are discussed. A thermodynamic-based description for the dependence of yield stress with temperature was developed, suggesting two acting work-hardening mechanisms. View Full-Text
Keywords: twinning; TWIP steel; stacking fault energy; mechanical properties; work hardening twinning; TWIP steel; stacking fault energy; mechanical properties; work hardening
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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De Barbieri, F.; Castro Cerda, F.; Pérez-Ipiña, J.; Artigas, A.; Monsalve, A. Temperature Dependence of the Microstructure and Mechanical Properties of a Twinning-Induced Plasticity Steel. Metals 2018, 8, 262.

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