TY - JOUR

T1 - On the micro-deformation mechanisms active in high-manganese austenitic steels under impact loading

AU - Bal, B.

AU - Gumus, B.

AU - Gerstein, G.

AU - Canadinc, D.

AU - Maier, H. J.

N1 - Funding information: The Turkish part of this study was supported by the Scientific and Technological Research Council of Turkey (TÜB?TAK) under Grant 112M806 , and partially by the Koç University TÜPRA? Energy Center (KÜTEM) seed funding program. The authors acknowledge the financial support by the German Research Foundation ( DFG ) within the Transregional Collaborative Research Center SFB/TR 73 subproject C4.

PY - 2015/2/27

Y1 - 2015/2/27

N2 - The composition and temperature dependencies of deformation response of TWIP and XIP steels were investigated under high-velocity impact loading with a focus on micro-scale deformation mechanisms. The promotion of twinning deformation under high-velocity loading over the slip-twin interactions usually observed in low-velocity loading conditions was comprehensively examined with scanning electron microscopy and transmission electron microscopy. In addition, thermal analyses of plastic deformation were carried out by in situ thermal imaging. The current findings demonstrate that the deformation of TWIP steel is dictated by two major twin systems at elevated temperatures, while nano-twin formation within one primary twin system dominates at subzero temperatures. The XIP steel, on the other hand, deforms mainly by slip at elevated temperatures, while competing slip and twin activities, and eventually nano-twin formation within primary twins dominates as the temperature decreases. Overall, the current findings shed light on the complicated work hardening mechanisms prevalent in high-manganese austenitic steels utilizing high-velocity deformation experiments.

AB - The composition and temperature dependencies of deformation response of TWIP and XIP steels were investigated under high-velocity impact loading with a focus on micro-scale deformation mechanisms. The promotion of twinning deformation under high-velocity loading over the slip-twin interactions usually observed in low-velocity loading conditions was comprehensively examined with scanning electron microscopy and transmission electron microscopy. In addition, thermal analyses of plastic deformation were carried out by in situ thermal imaging. The current findings demonstrate that the deformation of TWIP steel is dictated by two major twin systems at elevated temperatures, while nano-twin formation within one primary twin system dominates at subzero temperatures. The XIP steel, on the other hand, deforms mainly by slip at elevated temperatures, while competing slip and twin activities, and eventually nano-twin formation within primary twins dominates as the temperature decreases. Overall, the current findings shed light on the complicated work hardening mechanisms prevalent in high-manganese austenitic steels utilizing high-velocity deformation experiments.

KW - Impact

KW - Microstructure

KW - Slip

KW - Twinning

KW - TWIP steel

UR - http://www.scopus.com/inward/record.url?scp=84924663856&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2015.02.054

DO - 10.1016/j.msea.2015.02.054

M3 - Article

AN - SCOPUS:84924663856

VL - 632

SP - 29

EP - 34

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

SN - 0921-5093

ER -