The Mechanism of Heating Rate on the Secondary Recrystallization Evolution in Grain Oriented Silicon Steel

Abstract

Grain-oriented silicon steels were prepared at different heating rates during high temperature annealing, in which the evolution of magnetic properties, grain orientations and precipitates were studied. To illustrate the Zener factor, the diameter and number density of precipitates of interrupted testing samples were statistically calculated. The effect of precipitate ripening on the Goss texture and magnetic property was investigated. Data indicated that the trend of Zener factor was similar under different heating rates, first increasing and then decreasing, and that the precipitate maturing was greatly inhibited as the heating rate increased. Secondary recrystallization was developed at the temperature of 1 010 °C when a heating rate of 5 °C/h was used, resulting in Goss, Brass and {110} <227> oriented grains growing abnormally and a magnetic induction intensity of 1.90T. Furthermore, increasing the heating rate to 20 °C/h would inhibit the development of undesirable oriented grains and obtain a sharp Goss texture. However, when the heating rate was extremely fast, such as 40 °C/h, poor secondary recrystallization was developed with many island grains, corresponding to a decrease in magnetic induction intensity to 1.87 T. At a suitable heating rate of 20 °C/h, the sharpest Goss texture and the highest magnetic induction of 1.94 T with an onset secondary recrystallization temperature of 1 020 °C were found among the experimental variables in this study. The heating rate affected the initial temperature of secondary recrystallization by controlling the maturation of precipitates, leading to the deviation and dispersion of Goss texture, thereby reducing the magnetic properties.

References

[1] Silveira C C, Landgraf F J G, Paolinelli S C. Effect of Primary Grain Size and Nitrogen Content on the Magnetic Properties of a Grain-oriented Electrical Steel Obtained by Steckel Mill[J]. J. Magn. Magn. Mater., 2020, 503: 166 629

[2] Fu J, Tang M, Zhang Q. Simple Fabrication of Hierarchical Micro/nanostructure Superhydrophobic Surface with Stable and Superior Anticorrosion Silicon Steel via Laser Marking Treatment[J]. J. Wuhan Univ. Technol.-Mater. Sci. Ed., 2020, 35(2): 411-417

[3] Chen N, Zaefferer S, Lahn L, et al.. Effects of Topology on Abnormal Grain Growth in Silicon Steel[J]. Acta Mater., 2003, 51(6): 1 755-1 765

[4] Gao Q, Wang X, Li J, et al.. Effect of Aluminum on Secondary Recrystallization Texture and Magnetic Properties of Grain-oriented Silicon Steel[J]. J. Iron Steel Res. Int., 2021, 28: 479-487

[5] Mishra S, Därmann C, Lücke K. On the Development of the Goss Texture in Iron-3% Silicon[J]. Acta Metall., 1984, 32(12): 2 185-2 201

[6] Wang H, Li C, Zhan J, et al.. Effect of Ball Scribing on Power Loss Separation of Fe-3%Si Grain-oriented Silicon Steel[J]. J. Wuhan Univ. Technol.-Mater. Sci. Ed., 2016, 31(2): 435-439

[7] Gao Q, Li J, Wang X, et al.. Characteristic of Precipitate Evolution during High Temperature Annealing in Grain-Oriented Silicon Steel[J]. Metals, 2022, 12: 824

[8] Heo N H, Kim S B. Atmosphere Change of Vacuum to Hydrogen and Sharpness of {110}<001> Texture in Thin-gaged 3 Pct Si-Fe Alloy Strips[J]. Metall. Mater. Trans., 2006, 37(5): 1 689-1 691

[9] Yashiki H, Fukagawa T. Effect of Annealing Atmosphere on Secondary Recrystallization in 2.3% Si-1.7% Mn Steel[J]. Mater. Trans., 1996, 37(3): 503-508

[10] Takamiya T, Kurosawa M, Komatsubara M. Effect of Hydrogen Content in the Final Annealing Atmosphere on Secondary Recrystallization of Grain-oriented Si Steel[J]. J. Magn. Magn. Mater., 2003, 254–255: 334-336

[11] Liu G, Yang P, Mao W. Effect of Final Annealing Atmosphere on Secondary Recrystallization Behavior in Thin Gauge Medium Temperature Grain Oriented Silicon Steel[J]. Acta Metal. Sin., 2016, 52(1): 25-32

[12] Ushigami Y, Kumano T, Haratani T, et al.. Secondary Recrystallization in Grain-oriented Silicon Steel[J]. Mater. Sci. Forum, 2004, 467–470: 853-862

[13] Yoshitomi Y, Ushigami Y, Harase J, et al.. Influence Growth of Primary Recrystallized Grains on Secondary Recrystallization Texture in Fe-3% Si Alloy[J]. Mater. Sci. Forum, 1993, 113–115: 715-720

[14] Fan L, Zhao X, Zhu R, et al.. Effect of Heating Rate of Final Annealing Stage on Secondary Recrystallization in Grain-oriented Silicon Steel[J]. Metall. Res. Technol., 2020, 117(6): 607

[15] Fang F, Yang J, Zhang Y, et al.. Microstructure and Magnetic Properties of Ultra-thin Grain-oriented Silicon steel: Conventional Process Versus Strip Casting[J]. J. Magn. Magn. Mater., 2021, 535: 168 087

[16] Woo J, Han C, Hong B, et al.. Secondary Recrystallization of the Nitrided Fe-3% Si Alloy[J]. ISIJ Int., 1998, 38(10): 1 114-1 120

[17] Rohrer G S. Introduction to Grains, Phases, and Interfaces-an Interpretation of Microstructure. Trans. AIME, 1948, 175: 15-51 by C.S. Smith[J]. Metall. Mater. Trans. B, 2010, 41: 457–494

[18] Yan M, Qian H, Yang P, et al.. Analysis of Micro-texture during Secondary Recrystallization in a Hi-B Electrical Steel[J]. J. Mater. Sci. Technol., 2011, 27(11): 1 065-1 071

[19] Park J Y, Han K S, Woo J S, et al.. Influence of Primary Annealing Condition on Texture Development in Grain Oriented Electrical Steels[J]. Acta Mater., 2002, 50(7): 1 825-1 834

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