TY - JOUR
T1 - Dynamic strain aging in DP1000: Effect of temperature and strain rate
AU - Chandran, Sarath
AU - Liu, Wenqi
AU - Lian, Junhe
AU - Münstermann, Sebastian
AU - Verleysen, Patricia
N1 - Funding Information:
The authors gratefully acknowledge the European Commission Research Fund for Coal and Steel ( RFCS ) for the funding of project “Toolkit for the design of damage tolerant microstructures” [grant number: 709711] which supported present investigations. Also Ghent University is acknowledged for the support of the study into damage and plasticity of AHSS by providing funding for the research-assistant mandate of the first author.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/1/14
Y1 - 2022/1/14
N2 - The present study reports on an extensive experimental campaign performed to identify the occurrence of dynamic strain aging (DSA) in a fine-grained DP1000 steel. Tensile tests are performed covering 7 orders of strain rate, i.e., 0.0001 s-1 to 1080 s-1, and temperatures ranging from −40 °C to 400 °C. The test results are thoroughly analysed with particular attention to typical features of DSA, such as serrated flow, thermal hardening, negative strain rate sensitivity and blue brittleness. In addition to the plastic strain, DSA is sensitive to both temperature and strain rate. DSA effects are most dominant at higher temperatures and lower strain rates. However, even at the highest strain rate, traces of DSA are found in DP1000. At temperatures below 100 °C, no DSA is observed. The way and extent to which DSA manifests itself depend on the specific combination of temperature and strain rate. Analysis of the serrations stimulate the hypothesis that quasi-periodic dislocation cells might lie at their origin. In addition, scanning electron microscopy images of the fracture surfaces reveal finer and shallower dimples with flat features in the dynamic strain aging regime.
AB - The present study reports on an extensive experimental campaign performed to identify the occurrence of dynamic strain aging (DSA) in a fine-grained DP1000 steel. Tensile tests are performed covering 7 orders of strain rate, i.e., 0.0001 s-1 to 1080 s-1, and temperatures ranging from −40 °C to 400 °C. The test results are thoroughly analysed with particular attention to typical features of DSA, such as serrated flow, thermal hardening, negative strain rate sensitivity and blue brittleness. In addition to the plastic strain, DSA is sensitive to both temperature and strain rate. DSA effects are most dominant at higher temperatures and lower strain rates. However, even at the highest strain rate, traces of DSA are found in DP1000. At temperatures below 100 °C, no DSA is observed. The way and extent to which DSA manifests itself depend on the specific combination of temperature and strain rate. Analysis of the serrations stimulate the hypothesis that quasi-periodic dislocation cells might lie at their origin. In addition, scanning electron microscopy images of the fracture surfaces reveal finer and shallower dimples with flat features in the dynamic strain aging regime.
KW - Dual-phase steels
KW - Ductility
KW - Dynamic material behaviour
KW - Dynamic strain aging
KW - Fracture behaviour
KW - Serrations
UR - http://www.scopus.com/inward/record.url?scp=85121253349&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2021.142509
DO - 10.1016/j.msea.2021.142509
M3 - Article
AN - SCOPUS:85121253349
SN - 0921-5093
VL - 832
SP - 1
EP - 14
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
M1 - 142509
ER -