Significant effect of as-cast microstructure on texture evolution and magnetic properties of strip cast non-oriented silicon steel

doi:10.1016/j.jmst.2018.05.007

Abstract

Abstract:

In this study, two types of as-cast microstructure produced by strip casting were cold rolled and annealed to investigate the effect of initial microstructure on the textural evolution and magnetic properties of non-oriented silicon steel. The results indicated that the cold-rolled sheets of coarse-grained strip with pronounced {100} components exhibited stronger λ fiber (〈100〉//ND) and weaker γ fiber (〈111〉//ND) texture as composed to the fine-grained strip with strong Goss ({110}〈001〉) texture. After annealing, the former was dominated by η fiber (〈001〉//RD) texture with a peak at {110}〈001〉 orientation, while the latter consisted of strong {111}〈112〉 and relatively weak {110}〈001〉 texture. In addition, a number of precipitates of size ～30-150?nm restricted the grain growth during annealing, resulting in recrystallization of grain size of ～46?μm in the coarse-grained specimen and ～41?μm in the fine-grained specimen. Ultimately, higher magnetic induction (～1.72?T) and lower core loss (～4.04?W/kg) were obtained in the final annealed sheets of coarse-grained strip with strong {100} texture.

Key words: As-cast microstructure, Non-oriented silicon steel, Strip casting, Texture, Magnetic properties

Haitao Jiao, Yunbo Xu, Wenzheng Qiu, Haijie Xu, R.D.K. Misra, Yifeng Du, Jianping Li, Guodong Wang. Significant effect of as-cast microstructure on texture evolution and magnetic properties of strip cast non-oriented silicon steel[J]. J. Mater. Sci. Technol., 2018, 34(12): 2472-2479.

Figures/Tables 12

Table 1 Chemical composition (wt%) and casting parameters of as-cast strips.

Material	C	Si	Al	Mn	S	N	Superheat (°C)	Casting speed (m/min)
A	0.004	3.0	0.48	0.25	0.0044	0.0052	50	24
B	0.004	2.9	0.52	0.61	0.0056	0.0035	35	20

Fig. 1. Orientation image maps and the corresponding grain-boundary maps of (a) as-cast strip A and (b) as-cast strip B.

Fig. 2. Textures (φ2?=?45° section of ODFs) of (a) as-cast strip A and (b) as-cast strip B.

Fig. 3. Schematic of solidification for (a) material A and (b) material B during twin-roll strip casting.

Fig. 4. Cold rolled microstructure of (a) as-cast strip A and (b) as-cast strip B.

Fig. 5. Textures (φ2?=?45° section of ODFs) of the cold rolled sheets of (a) as-cast strip A and (b) as-cast strip B.

Fig. 6. Microstructural evolution during partial recrystallization annealing at 670-720?°C for 60?s in material A and material B.

Fig. 7. Microstructure of the final annealed sheets of (a) material A and (b) material B.

Fig. 8. TEM morphologies of precipitates in the final annealed sheets of (a), (b) material A and (c), (d) material B.

Fig. 9. Texture of the final annealed sheets of (a) material A and (b) material B.

Fig. 10. Orientation image map and the corresponding map showing several specific components of the partially recrystallized microstructure in (a) material A and (b) material B after annealing at 720?°C for 60?s.

Table 2 Magnetic properties of final annealed sheets.

Material	Magnetic induction B₅₀ (T)			Core loss P_15/50 (W/kg)
Material	RD	TD	Average	RD	TD	Average
A	1.73	1.71	1.72	3.95	4.13	4.04
B	1.71	1.69	1.70	4.12	4.36	4.24

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