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Journal of Materials Engineering and Performance

, Volume 28, Issue 1, pp 231–241 | Cite as

Design and Development of Galvannealed Dual-Phase Steel: Microstructure, Mechanical Properties and Weldability

  • Sourabh Chatterjee
  • Soumyajit Koley
  • Rudra Bubai Sarkar
  • Nibedita Behera
  • Manindra Manna
  • Subrata Mukherjee
  • Saurabh Kundu
Article
  • 51 Downloads

Abstract

It was attempted to produce galvannealed dual-phase (DP) steel through a commercial continuous galvanizing line (CGL). The main challenge was to form the DP microstructure even with the slow cooling rate after annealing in the CGL. A two-pronged approach was adopted for this, viz. design of the steel chemistry with calculations and optimization of the CGL parameters with simulation using Gleeble-3800 thermomechanical simulator. The steel thus produced in CGL revealed ferrite and 18 ± 2% martensite microstructure, with tensile strength exceeding 600 MPa and 24% total elongation along with good formability. Weldability study using resistance spot welding indicated the possibility of achieving sound joint with a 4-kA width in weld time–current lobe despite the high carbon equivalence.

Keywords

dual-phase formability galvannealing mechanical properties resistance spot welding steel weldability 

Notes

Acknowledgments

The authors would like to express sincere gratitude to the management of Tata Steel Ltd., for the permission to carry out the work and publish the results. This would not be completed without thanking all the line staff at various mills such as steelmaking shop, hot-rolling and cold-rolling mill for their kind cooperation while executing the trial plan to make this a success at this scale.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Sourabh Chatterjee
    • 1
  • Soumyajit Koley
    • 1
  • Rudra Bubai Sarkar
    • 1
  • Nibedita Behera
    • 1
  • Manindra Manna
    • 1
  • Subrata Mukherjee
    • 1
  • Saurabh Kundu
    • 1
  1. 1.Research & DevelopmentTata Steel LimitedJamshedpurIndia

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