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01-06-2015 | Communication | Issue 6/2015

Metallurgical and Materials Transactions A 6/2015

Observation of the TWIP + TRIP Plasticity-Enhancement Mechanism in Al-Added 6 Wt Pct Medium Mn Steel

Journal:
Metallurgical and Materials Transactions A > Issue 6/2015
Authors:
Seawoong Lee, Kyooyoung Lee, Bruno C. De Cooman
Important notes
Manuscript submitted December 23, 2014.

Abstract

The intercritically annealed Fe-0.15 pctC-6.0 pctMn-1.5 pctSi-3.0 pctAl and Fe-0.30 pctC-6.0 pctMn-1.5 pctSi-3.0 pctAl medium Mn steels were found to have improved mechanical properties due to the TWIP and TRIP plasticity-enhancing mechanisms being activated in succession during tensile deformation. The increase of the C content from 0.15 to 0.30 pct resulted in ultra-high strength properties and a strength-ductility balance of approximately 65,000 MPa-pct, i.e., equivalent to the strength-ductility balance of high Mn TWIP steel with a fully austenitic microstructure.

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