Effect of Residual Carbon on Primary and Secondary Recrystallization of Grain-oriented Silicon Steel

doi:10.11901/1005.3093.2019.346

Chinese Journal of Materials Research

2020, Vol. 34

Issue (2): 118-124 DOI: 10.11901/1005.3093.2019.346

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Effect of Residual Carbon on Primary and Secondary Recrystallization of Grain-oriented Silicon Steel

FU Yongjun,LEI Jialiu(

),LIAO Qingling,ZHAO Dongnan,ZHANG Yucheng

School of Materials Science and Engineering, Hubei Polytechnic University, Huangshi 435000，China

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FU Yongjun,LEI Jialiu,LIAO Qingling,ZHAO Dongnan,ZHANG Yucheng. Effect of Residual Carbon on Primary and Secondary Recrystallization of Grain-oriented Silicon Steel. Chinese Journal of Materials Research, 2020, 34(2): 118-124.

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Abstract

The effect of residual carbon on the microstructure of the primary and secondary recrystallization of the grain-oriented silicon steel was investigated, whereas, the carbon content of the steel was controlled via varying the steam amount in the gas mixture 25%H₂+75%N₂ for the annealing process. The results show that the average grain size of primary recrystallization decreased and the grain size difference between the surface portion and the center portion increase with the increase of residual carbon content in the steel subjected to decarburization annealing. The texture of primary recrystallization changed from strong {111}<110> or {111}<112> into strong {112}<110> , while the texture of some Goss grains in 1/4 layer or {111}<112> grains was also altered. The steel subjected to high temperature annealing had imperfect secondary recrystallization and bad magnetic properties when the carbon content in the sample was higher than 0.0200%. Phase transformation is the main reason that led to the above phenomena.

Key words: metallic materials grain-oriented silicon steel decarburization annealing carbon content magnetic properties texture

Received: 15 July 2019

ZTFLH:

TG142.77

Fund: National Natural Science Foundation of China(51704105);National High Technology Research and Development Program of China(2012AA03A505);Hubei Provincial Central Committee Guides Local Science and Technology Development Project(2019ZYYD006);Guiding Projects of Science and Technology Research Program of Hubei Education Department(B2019227);Scientific Research Projects of Hubei Polytechnic University(18xjz05R)

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	Yongjun FU
	Jialiu LEI
	Qingling LIAO
	Dongnan ZHAO
	Yucheng ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.346 OR https://www.cjmr.org/EN/Y2020/V34/I2/118

Table 1 Main element content for grain oriented silicon steel subjected to cold rolling

Fig.1 Schematic diagram of decarburization annealing for oriented silicon steel

Fig.2 Process scheme of high temperature annealing

Fig.3 Decarburization amount and residual carbon content of grain oriented silicon after decarburization annealing at different water bath temperature

Fig.4 Microstructure of samples with different residual carbon content after decarburization annealing for grain oriented silicon steel (a) C=0.0029%; (b) C=0.0088%; (c) C=0.0152%; (d) C=0.0200%; (e) C=0.0265%

Fig.5 Average grain size of samples subjected to decarburization annealing for grain oriented silicon steel with different residual carbon content

Fig.6 Macrostructure of samples with different residual carbon content after high temperature annealing for grain oriented silicon steel (a) C=0.0029%; (b) C=0.0088%; (c) C=0.0152%; (d) C=0.0200%; (e) C=0.0265%

Fig.7 Recrystallization ratio and grain size of secondary recrystallization for grain oriented silicon steel with different residual carbon content

Fig.8 Effect of residual carbon content on magnetic properties of grain oriented silicon steel after high temperature annealing

Fig.9 Microstructure of grain oriented silicon steel after intermediate annealing

Fig.10 EBSD oriented images of samples after decarburization annealing for grain oriented silicon steel with different residual carbon content (a) Mapping image of sample with 0.0029% carbon; (b) Mapping image of sample with 0.0152% carbon; (c) Mapping image of sample with 0.0265% carbon; (d) ODF section diagram (φ₂=45°) of sample with 0.0029% carbon; (e) ODF section diagram (φ₂=45°) of sample with 0.0152% carbon; (f) ODF section diagram (φ₂=45°) of sample with 0.0265% carbon; (g) Texture type on ODF section diagram (φ₂=45°)

Fig.11 Effect of annealing temperature on γ content of sample with 0.0265% carbon

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