TY - JOUR

T1 - Tailoring extra-strength of a TWIP steel by combination of multi-pass equal-channel angular pressing and warm rolling

AU - Abramova, Marina

AU - Raab, Arseniy

AU - Valiev, Ruslan Z.

AU - Khannanova, Anna

AU - Lee, Chong Soo

AU - Kim, Jae Nam

AU - Jang, Gyeong Hyeon

AU - Kim, Jung Gi

AU - Kim, Hyoung Seop

AU - Renk, Oliver

AU - Enikeev, Nariman

N1 - Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2021/3

Y1 - 2021/3

N2 - Increasing the yield stress of twinning-induced plasticity (TWIP) steels is a demanding task for modern materials science. This aim can be achieved by microstructure refinement induced by heavy straining. We feature the microstructural evolution and mechanical performance of a high-manganese TWIP steel subjected to deformation treatment by different combinations of equal channel angular pressing (ECAP) and rolling at different temperatures. The effect of microstructure on the tensile properties of the steel subjected to the multi-pass ECAP process and to subsequent rolling is reported as well. We show that the combined deformation procedure allows us to further increase the strength of the processed workpieces due to a gradual transition from a banded structure to a heterogeneous hierarchical microstructure consisting of fragments, dislocation configurations and nano-and micro-twins colonies. Rolling of multi-pass ECAP specimens at 375◦C allowed us to achieve an extraordinary strength, the highest among all the investigated cases, while the best trade-off between yield strength and elongation to failure was reached using multi-pass ECAP followed by rolling at 500◦C. This study shows a great potential of using combined deformation techniques to enhance the mechanical performance of TWIP steels.

AB - Increasing the yield stress of twinning-induced plasticity (TWIP) steels is a demanding task for modern materials science. This aim can be achieved by microstructure refinement induced by heavy straining. We feature the microstructural evolution and mechanical performance of a high-manganese TWIP steel subjected to deformation treatment by different combinations of equal channel angular pressing (ECAP) and rolling at different temperatures. The effect of microstructure on the tensile properties of the steel subjected to the multi-pass ECAP process and to subsequent rolling is reported as well. We show that the combined deformation procedure allows us to further increase the strength of the processed workpieces due to a gradual transition from a banded structure to a heterogeneous hierarchical microstructure consisting of fragments, dislocation configurations and nano-and micro-twins colonies. Rolling of multi-pass ECAP specimens at 375◦C allowed us to achieve an extraordinary strength, the highest among all the investigated cases, while the best trade-off between yield strength and elongation to failure was reached using multi-pass ECAP followed by rolling at 500◦C. This study shows a great potential of using combined deformation techniques to enhance the mechanical performance of TWIP steels.

KW - Equal-channel angular pressing

KW - Mechanical properties

KW - Mi-crostructure

KW - Rolling

KW - TWIP steel

KW - Ultrafine-grained materials

UR - http://www.scopus.com/inward/record.url?scp=85102779941&partnerID=8YFLogxK

U2 - 10.3390/met11030518

DO - 10.3390/met11030518

M3 - Article

AN - SCOPUS:85102779941

VL - 11

SP - 1

EP - 13

JO - Metals

JF - Metals

SN - 2075-4701

IS - 3

M1 - 518

ER -