Effect of Rapid Thermal Process on the Recrystallization and Precipitation in Non-Oriented Electrical Steels Produced by Twin-Roll Strip Casting

Abstract:

A Fe-1.3% Si non-oriented silicon steel strip was produced by twin-roll strip casting process, and subsequently treated with cold rolling and annealing. The effect of heating rates on the recrystallization and precipitation behavior of second phase particles (AlN and MnS) was investigated by MMS-200 thermal mechanical simulator. It was found that the recrystallization area fraction decreased obviously with the increase of heating rate. At the heating rate of 5 °C/s, the recrystallization rate gradually decreased with the extension of holding time, but it increased at the rapid heating rates. The particle’s sizes mainly concentrated in 50~200 nm at the heating rate of 5 °C/s during annealing. The number of particles under 50nm increased gradually and the number of precipitates between 50~400 nm reduced significantly when the heating rate was increased to 50~300 °C/s. The results indicated that the rapid heating rate could refine the size of precipitates and decrease the number of particles above 50nm.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 728-733
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.728
• Online since: March 2016
• Authors: Qiong Qiong Han, Hai Tao Jiao, Yang Wang, Y.X. Zhang, Wen Zheng Qiu, Cong Wen Zhao, Yong Mei Yu, Yun Bo Xu*
• Keywords: Non-Oriented Electrical Steel, Precipitation, Rapid Thermal Process, Recrystallization, Strip Casting

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