The dynamic behaviour of a twinning induced plasticity steel

K. M. Rahman, V. A. Vorontsov, D. Dye

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The influence of strain rate on the twinning behaviour and microstructure of an Fe–15Mn–2Al–2Si–0.7C twinning induced plasticity (TWIP) steel has been investigated. A Hopkinson pressure bar setup was used in addition to blast testing to perform the high strain rate testing. The yield stress exhibited a positive strain rate sensitivity with increasing strain rate. However, the failure strain of the material was relatively unaffected. Post-deformation microscopy indicated that deformation twinning was less profuse at higher strain rates. Electron backscatter diffraction also indicated the activation of multiple twin systems at strain rates below 1000 s−1 although this did not occur at the higher strain rates tested. A large intragranular misorientation was found to exist in the material tested at lower strain rates indicating a relatively larger dislocation density existing in the material tested at lower strain rates. In addition selected grains in the blast tested material exhibited a ‘wavy’ structure which was determined not to be due to a phase transformation. It is suggested that this was caused by the complex loading experienced by the material during testing. High resolution transmission electron microscopy also indicated a large density of intrinsic stacking faults in the material subjected to blast testing.

LanguageEnglish
Pages252-261
Number of pages10
JournalMaterials Science and Engineering A
Volume589
DOIs
Publication statusPublished - 1 Jan 2014

Fingerprint

Steel
Twinning
twinning
plastic properties
strain rate
Plasticity
Strain rate
steels
blasts
Testing
Materials testing
Stacking faults
High resolution transmission electron microscopy
Electron diffraction
crystal defects
misalignment
phase transformations
Yield stress
Microscopic examination
Phase transitions

Keywords

  • austenite
  • mechanical characterisation
  • steel
  • twinning
  • yield phenomena
  • twinning induced plasticity (TWIP)

Cite this

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The dynamic behaviour of a twinning induced plasticity steel. / Rahman, K. M.; Vorontsov, V. A.; Dye, D.

In: Materials Science and Engineering A, Vol. 589, 01.01.2014, p. 252-261.

Research output: Contribution to journalArticle

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