A. Etemad, G. Dini, S. Schwarz:
"Accumulative roll bonding (ARB)-processed high-manganese twinning induced plasticity (TWIP) steel with extraordinary strength and reasonable ductility";
Materials Science and Engineering A,
Accumulative roll bonding (ARB) process at room temperature was used to fabricate a nanostructured twinninginduced
plasticity (TWIP) steel. The effect of the number of ARB cycles from 1 to 3 on the microstructure and
mechanical properties of Fe-31Mn-3Al-3Si (wt%) TWIP steel was investigated. The results showed that the
microstructure of the 1-cycle ARB-processed sample mainly contained the primary and secondary mechanical
twins. However, in the microstructure of 2-cycle ARB-processed sample, new configurations of small nanotwins
which they are known as the hierarchical nanotwinned (HNT) structures were observed between the secondary
mechanical twins. In the microstructure of 3-cycle ARB-processed sample, new subdivided grains with a mean
size of about 100 nm were produced. Additionally, the 3-cycle ARB-processed TWIP steel sample exhibited
extraordinary strength (about 1.2 GPa) and reasonable ductility (about 15%). The mechanical behavior of ARBprocessed
TWIP steel was interpreted as the evidence for microstructural features such as the mechanical twins
(especially, the HNT structures) and nano/ultrafine grains.
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