Effect of overaging on the properties of dual phase steel during continuous annealing

X. Tao*, S. Birosca, Han S. Kim, B. C. De Cooman

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The effect of the overaging step in the continuous annealing process on the microstructure and mechanical properties of cold-rolled CMnSi dual-phase ferrite-martensite steel was investigated. Overaging was performed at 50°C and 90°C. Dilatometry was used to determine the intercritical temperatures, the Ms and Mf temperatures, and simulate the overaging step. The amount of solute carbon in ferrite was determined by internal friction. Optical Microscopy and Field Emission Scanning Electron Microscopy were applied to study the overaged DP microstructures. Mechanical properties of DP steels were tested by means of uniaxial tensile tests. The results of the investigation show that a high overaging temperature (90°C) and a long overaging time, longer than 250 seconds, are favored to increase the ductility of the DP steel without loss of strength.

Original languageEnglish
Title of host publicationMaterials Science and Technology Conference and Exhibition, MS and T'07 - "Exploring Structure, Processing, and Applications Across Multiple Materials Systems"
Pages49-60
Number of pages12
Volume1
Publication statusPublished - Sep 2007
EventMaterials Science and Technology Conference and Exhibition, MS and T'07 - "Exploring Structure, Processing, and Applications Across Multiple Materials Systems" - Detroit, MI, United States
Duration: 16 Sep 200720 Sep 2007

Publication series

NameMaterials Science and Technology Conference and Exhibition, MS and T'07 - "Exploring Structure, Processing, and Applications Across Multiple Materials Systems"
Volume1

Conference

ConferenceMaterials Science and Technology Conference and Exhibition, MS and T'07 - "Exploring Structure, Processing, and Applications Across Multiple Materials Systems"
Country/TerritoryUnited States
CityDetroit, MI
Period16/09/0720/09/07

Keywords

  • Continuous annealing
  • Dual phase
  • Overaging

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