Effect of Continuous Annealing Parameters on the Microstructure and Magnetic Property of Cold Rolled Dual Phase Steel

Abstract:

The effect of continuous annealing parameters on the microstructure and magnetic property of cold rolled dual phase steel (DP steel) are investigated. Correlations of microstructure, magnetic properties and continuous annealing parameters are revealed. The mechanism of the magnetic property varying with continuous annealing process is also discussed. The results show that recrystallization is almost completed when heating to 740°C. For the DP steel soaked in the range of 770°C-830°C and quenched in different temperature, the TEM results indicate its microstructure mainly consists of the ferrite and martensite phase. The martensite volume fraction increases gradually with increasing the soaking and quenching temperature. It is found that magnetic properties of dual phase steel are very sensitive to continuous annealing process. With rising soaking and quenching temperature, the coercivity and hysteresis loss increase obviously, whereas the maximum permeability and the remanent induction tend to decrease.

• Periodical: Advanced Materials Research (Volumes 476-478)
• Pages: 241-247
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.476-478.241
• Online since: February 2012
• Authors: Li Gao, Qiu Hong Song, Jun Ting Yuan
• Keywords: Continuous Annealing Process, Dual Phase Steel, Magnetic Property, Microstructure

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