Effect of Strengthening Mechanism on Strain-Rate Related Tensile Properties of Low-Carbon Sheet Steels for Automotive Application

  • Anindya Das
  • Pinaki Biswas
  • S. Tarafder
  • D. Chakrabarti
  • S. Sivaprasad
Article
  • 4 Downloads

Abstract

In order to ensure crash resistance of the steels used in automotive components, the ensile deformation behavior needs to be studied and predicted not only under quasi-static condition, but also under dynamic loading rates. In the present study, tensile tests have been performed on four different automobile grade sheet steels, namely interstitial free steel, dual-phase 600 and 800, and a carbon manganese steel over the strain rate regime of 0.001-800/s. Apart from the variation in strength (which always increased with strain rate), the effect of strengthening mechanism on strain rate sensitivity and strain hardening behavior has been evaluated. Strain rate sensitivity was found to increase at high-strain rate regime for all the steels. Contribution of solid solution hardening on strain rate sensitivity at lower plastic strains was found to be higher compared to dislocation strengthening and second-phase hardening. However, precipitation hardening coupled with solid solution hardening produced the highest strain rate sensitivity, in C-Mn-440 steel at high strain rates. Different strain-rate-sensitive models which take into account the change in yield stress and strain hardening behavior with strain rate for ductile materials were used to predict the flow behavior of these sheet steels at strain rates up to 800/s.

Keywords

crashworthiness high strain rate strain rate sensitivity strengthening mechanism tensile test 

Notes

Acknowledgment

The authors are grateful to Tata Steel Ltd., Jamshedpur, for providing the financial support to carry out the project work in CSIR-NML, Jamshedpur.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Anindya Das
    • 1
  • Pinaki Biswas
    • 2
  • S. Tarafder
    • 1
  • D. Chakrabarti
    • 3
  • S. Sivaprasad
    • 1
  1. 1.MTE DivisionCSIR-NMLJamshedpurIndia
  2. 2.R&D, Tata steel LimitedJamshedpurIndia
  3. 3.Metallurgical and Materials Engineering DepartmentIIT KharagpurKharagpurIndia

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