Influence of Phosphorous and Boron on the Recrystallization, Grain Growth and Mechanical Properties of 3% Si Steel

Abstract:

A new approach to obtain high strength of non-oriented electrical steel by addition of phosphorus is proposed. The method includes B-additions which suppress grain boundary P segregation, strengthen the grain boundary cohesion and enhance the P solid solution hardening. Two 3% Si steels, a B-free 0.1%P steel and a 20 ppm B-added 0.1%P steel were analyzed. The microstructures were studied by EBSD. The B-addition resulted in a pronounced rotated cube component, {100}<011>, after a hot-band annealing treatment. A -fiber texture was developed in the B-free steel. The B-addition caused a retardation of the recrystallization, allowing for the growth of grains with a lower stored energy, such as rotated cube oriented grains. The steels were further cold rolled and recrystallization annealed to observe a similar effect after large cold reductions. The present contribution focuses on the potential of this concept to obtain high strength 3% Si steels with low core losses.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 302-305
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.302
• Online since: June 2010
• Authors: Se Il Lee, Bruno C. De Cooman
• Keywords: Electron Backscatter Diffraction (EBSD), Grain Growth, Recrystallization, Segregation, Silicon Steel, Tensile Properties

References

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DOI: 10.2355/isijinternational.47.1666

[2] B. De Cooman, J. G. Speer, I. Y. Pyshimintsev and N. Yoshinaga, Materials Design-The Key to Modern Steel Products, (2007).