Dynamic strain aging in DP1000: Effect of temperature and strain rate

Sarath Chandran; Wenqi Liu; Junhe Lian; Sebastian Münstermann; Patricia Verleysen

doi:10.1016/j.msea.2021.142509

Dynamic strain aging in DP1000: Effect of temperature and strain rate

Sarath Chandran^*
, Wenqi Liu
, Junhe Lian
, Sebastian Münstermann
, Patricia Verleysen

^*Corresponding author for this work

Department of Energy and Mechanical Engineering

Research output: Contribution to journal › Article › Scientific › peer-review

23 Citations (Scopus)

Abstract

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.

Original language	English
Article number	142509
Pages (from-to)	1-14
Number of pages	14
Journal	Materials Science and Engineering A
Volume	832
DOIs	https://doi.org/10.1016/j.msea.2021.142509
Publication status	Published - 14 Jan 2022
MoE publication type	A1 Journal article-refereed

Funding

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.

Keywords

Dual-phase steels
Ductility
Dynamic material behaviour
Dynamic strain aging
Fracture behaviour
Serrations

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10.1016/j.msea.2021.142509

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abstract = "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.",

keywords = "Dual-phase steels, Ductility, Dynamic material behaviour, Dynamic strain aging, Fracture behaviour, Serrations",

author = "Sarath Chandran and Wenqi Liu and Junhe Lian and Sebastian M{\"u}nstermann and Patricia Verleysen",

note = "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: {\textcopyright} 2021 Elsevier B.V.",

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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.

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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.

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KW - Fracture behaviour

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Dynamic strain aging in DP1000: Effect of temperature and strain rate

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