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Effect of boron on microstructure and mechanical properties of low carbon microalloyed steels

McGill University
Publication Date
  • Bainitic Steel -- Microstructure.
  • Bainitic Steel -- Mechanical Properties.
  • Boron Steel.
  • Microalloying.


The results indicate that during thermo-mechanical controlled rolling (TCR), the final properties of the products not only depend on the applied deformation but also depend on the coiling temperature where phase transformation takes place. According to the investigation, two strengthening mechanisms are responsible for the strength of the steel at the coiling temperature: phase transformation and precipitation. Under optical microscopy, the microstructures of all specimens appear to be bainite in a temperature range from 350°C to 600°C without distinct differences. However, the SEM micrographs revealed that the microstructures at 550°C are very different from the microstructures transformed at the other holding temperatures.

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