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Effect of strain rate on true stress–true strain relationships of ultrafine-grained ferrite–cementite steels up to plastic deformation limit.

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Title: Effect of strain rate on true stress–true strain relationships of ultrafine-grained ferrite–cementite steels up to plastic deformation limit.
Authors: Tsuchida, N.1 tsuchida@eng.u-hyogo.ac.jp, Nakano, H.2, Okamoto, T.2, Inoue, T.3
Source: Materials Science & Engineering: A. Feb2015, Vol. 626, p441-448. 8p.
Subjects: Strain rate, Cementite, Ferrites, Material plasticity, Steel, Grain size
Abstract: The true stress ( σ )–true strain ( ε ) relationships up to the plastic deformation limit of low-carbon ferrite–cementite (FC) steels with ferrite grain sizes between 0.5 and 34 μm were estimated at strain rates between 3.3×10 −1 and 5.0×10 −4 s −1 to investigate the effect of the strain rate on the σ–ε relationship. Both σ and ε increased with increasing strain rate for each of the FC steels considered, and larger work-hardening rates were observed with increasing strain rate in the ultrafine-grained FC specimens with average ferrite grain sizes less than 1 μm. Increasing the strain rate was found to be effective in improving σ and ε up to the plastic deformation limit. The important factors in obtaining good σ–ε relationships in FC steels are the loads and the radius of curvature of the neck profile after the maximum load point. On the basis of experimental results that both σ and ε can improve under high-speed deformation such as at 10 −1 s −1 (as in static tensile tests) and that the decrease in ductility with increasing strain rate was small, grain refinement of up to 0.8 μm was concluded to be effective in improving the tensile deformation behavior of the low-carbon FC steels considered in this study. [ABSTRACT FROM AUTHOR]
Copyright of Materials Science & Engineering: A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Effect of strain rate on true stress–true strain relationships of ultrafine-grained ferrite–cementite steels up to plastic deformation limit.
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  Data: <searchLink fieldCode="AR" term="%22Tsuchida%2C+N%2E%22">Tsuchida, N.</searchLink><relatesTo>1</relatesTo><i> tsuchida@eng.u-hyogo.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Nakano%2C+H%2E%22">Nakano, H.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Okamoto%2C+T%2E%22">Okamoto, T.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Inoue%2C+T%2E%22">Inoue, T.</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Materials+Science+%26+Engineering%3A+A%22">Materials Science & Engineering: A</searchLink>. Feb2015, Vol. 626, p441-448. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Strain+rate%22">Strain rate</searchLink><br /><searchLink fieldCode="DE" term="%22Cementite%22">Cementite</searchLink><br /><searchLink fieldCode="DE" term="%22Ferrites%22">Ferrites</searchLink><br /><searchLink fieldCode="DE" term="%22Material+plasticity%22">Material plasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Steel%22">Steel</searchLink><br /><searchLink fieldCode="DE" term="%22Grain+size%22">Grain size</searchLink>
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  Label: Abstract
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  Data: The true stress ( σ )–true strain ( ε ) relationships up to the plastic deformation limit of low-carbon ferrite–cementite (FC) steels with ferrite grain sizes between 0.5 and 34 μm were estimated at strain rates between 3.3×10 −1 and 5.0×10 −4 s −1 to investigate the effect of the strain rate on the σ–ε relationship. Both σ and ε increased with increasing strain rate for each of the FC steels considered, and larger work-hardening rates were observed with increasing strain rate in the ultrafine-grained FC specimens with average ferrite grain sizes less than 1 μm. Increasing the strain rate was found to be effective in improving σ and ε up to the plastic deformation limit. The important factors in obtaining good σ–ε relationships in FC steels are the loads and the radius of curvature of the neck profile after the maximum load point. On the basis of experimental results that both σ and ε can improve under high-speed deformation such as at 10 −1 s −1 (as in static tensile tests) and that the decrease in ductility with increasing strain rate was small, grain refinement of up to 0.8 μm was concluded to be effective in improving the tensile deformation behavior of the low-carbon FC steels considered in this study. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials Science & Engineering: A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.msea.2014.12.080
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        Text: English
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      – SubjectFull: Strain rate
        Type: general
      – SubjectFull: Cementite
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      – SubjectFull: Ferrites
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      – SubjectFull: Material plasticity
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              Text: Feb2015
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