Deformation twinning and martensitic transformation and dynamic mechanical properties in Fe–0.07C–23Mn–3.1Si–2.8Al TRIP/TWIP steel

In the study described here, we have explored the evolution of microstructure and mechanical properties in Fe-0.07C-23Mn-3.1Si-2.8Al steel with a stacking fault energy (SFE) in the intermediate range of 15-20mJm-2 during dynamic deformation and in the strain rate range of 101-103 s-1. The results sh...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-01, Vol.624, p.186-192
Main Authors: Tang, Z.Y., Misra, R.D.K., Ma, M., Zan, N., Wu, Z.Q., Ding, H.
Format: Article
Language:English
Subjects:
Deformation
Dynamics
Elongation
Microstructure
Plasticity
Strain rate
Transformations
TRIP steels
Twinning
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Summary:In the study described here, we have explored the evolution of microstructure and mechanical properties in Fe-0.07C-23Mn-3.1Si-2.8Al steel with a stacking fault energy (SFE) in the intermediate range of 15-20mJm-2 during dynamic deformation and in the strain rate range of 101-103 s-1. The results showed that the transformation induced plasticity (TRIP) effect and twinning induced plasticity (TWIP) effect coexist during dynamic deformation. The mode of austenite-to-martensite transformation is gamma arrow right epsilon , epsilon arrow right alpha '. With increase in the strain rate, the volume fraction intermediate epsilon -martensite was increased and alpha '-martensite remained nearly constant, and the frequency of the intersecting deformation twins was also increased. This behavior of steel was responsible for a good combination of ultimate tensile strength of 913MPa and total elongation of 75.4% at a strain rate of 103 s-1. The strength and elongation increased significantly with an increase in strain rate in the range of 101-103 s-1. The dominant plasticity enhancing mechanisms with increase in strain rate were strain-induced intermediate epsilon -martensite and intersecting deformation twins.
ISSN:0921-5093
DOI:10.1016/j.msea.2014.11.078