Influence of Hot Rolling Condition on the Final Microstructure of Non-Oriented Electrical Steel Fe-3.2 wt.% Si

Stöcker, Anett; Franke, Armin; Hermann, H.; Kawalla, Rudolf

doi:10.4028/www.scientific.net/msf.854.16

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Only a few primary recrystallized grains clustered at the edge of the grains, and the RD−ND surface shows a texture gradient after normalized annealing at 850 °C for 3 min. [ 11 ] Edge layer is mainly featured on Goss({110}<001>) texture, while the center layer is mainly based on {001}<110> texture. Figure 3a 1 was dominated by Goss texture (intensity 11.8).…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Influence of the Normalized and Final Annealing Process on High‐Strength Nonoriented Silicon Steel

Song

Wang

et al. 2022

steel research int.

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High-strength nonoriented silicon steel is widely used to make automobile engines. On the basis of ensuring certain magnetic properties, it also needs higher mechanical properties. The matching of magnetic and mechanical properties can be achieved by comprehensive control of normalized and final annealing. Different annealing temperatures and times are applied to clarify the change of texture, thus influencing magnetic induction, iron loss, and mechanical properties. Route B obtains the optimal normalization effect. The type and volume fraction of texture in the final annealing sheet differ a lot after incomplete and fully normalized annealing, depending on the degree of recrystallization. The final texture composition remains unchanged when normalized annealing is incomplete, while full normalized annealing leads to the disappearance of some textures. The mechanical and magnetic properties of the final annealing sheet show consistency when fully normalized. The sheet achieved by route B 2 are R p0.2 %513 MPa, R m %646 MPa, elongation %17.2%, P 10/400 % 28.7 W kg À1 , and B 50 %1.64 T, achieving the best mechanical and magnetic properties in combination.

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Section: Resultsmentioning

confidence: 99%

Comprehensive Influence of the Normalized and Final Annealing Process on High‐Strength Nonoriented Silicon Steel

Song

Wang

et al. 2022

steel research int.

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“…Due to the high silicon content of the test steel, the thermal deformation activation energy of the high-silicon nonoriented silicon steel is large. The increase of the thermal deformation activation energy leads to the increase of the peak stress of the nonoriented silicon steel with the increase of the silicon content; however, the recrystallization fraction decreased, [14,15] and the central layer of hot rolled sheet is all deformed microstructure in the state of tension.…”

Section: Methodsmentioning

confidence: 99%

Effect of Cold Rolling Reduction Ratio on Microstructure and Magnetic Properties of Secondary Cold‐Rolled High‐Grade Nonoriented Silicon Steel

Wei

Yuan

Luo

et al. 2023

steel research int.

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Trial production of 0.25 mm‐thick thin‐gauge high‐grade nonoriented silicon steel with a Si content of 3.5% by the secondary cold rolling process is studied. The recrystallization microstructure and magnetic properties are systematically studied by the microstructure, texture evolution, and the effect of two‐stage cold rolling reduction ratios (37.5–70.5%) during the whole process. The results show that the magnetic induction intensity B5000 first increases and then decreases; the iron loss first decreases and then increases at the frequencies of 50 and 400 Hz with the reduction of the cold rolling reduction rate in the second stage. The cubic and Goss texture of the finished annealed sheet has the highest strength when the reduction ratio of the second stage cold rolling is 58.3%. The highest magnetic induction intensity, B5000 = 1.671 T. Lowest iron loss, P1.0/50 = 0.83 W kg−1, P1.5/50 = 1.98 W kg−1, and P1.0/400 = 11.94 W kg−1, respectively.

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“…The standard procedure for non-oriented electrical steels fabrication involves casting, hot rolling, cold rolling, and final annealing. It is worth mentioning that a wide typology of these materials is produced by steel chemical composition variation (mainly Si and Al content) and acting on process parameters at different processing steps [20][21][22][23]. The proper manufacturing route requires a high reduction ratio (higher than 80%) at cold rolling.…”

Section: Introductionmentioning

confidence: 99%

“…In case of Fe-Si steels with phase transformation, the modification of the hot rolling schedule or hot finishing temperature could improve the magnetization behavior due to the sharper texture components [37][38][39]. Stöcker et al [23] investigated the effect of different hot rolling conditions and showed that the highest reduction per pass during hot rolling led to pronounced recrystallization, and consequently, to weaker overall texture and no dominant texture components at the surface. Moreover, after the final annealing, the material exhibited the strongest texture with a strong γ-fiber as an inheritance from the cold rolling step.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Fast Heating Treatment Effect on Microstructure, Mechanical Properties and Magnetic Characteristics of Non-Oriented Grain Electrical Steels

Gaggiotti,

Albini,

Stornelli

et al. 2023

Applied Sciences

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This paper focuses on the effect of rapid annealing on Non-Grain Oriented Electrical Steel (NGO) in terms of microstructure, mechanical properties, and magnetic properties. The Ultra-Fast Heating (UFH) tests were performed by a transversal induction heater on NGO electrical steel samples (cold rolled down to 0.5 mm), varying the heating power (80 kW and 90 kW) and the speed of the strip through the induction heater. This allowed us to exploit heating rates (HR) in the range of 200–300 °C/s and targeting peak temperature (Tpeak) up to a maximum of 1250 °C. The comparison between the microstructure as obtained by conventional annealing and the ultra-fast heating process highlights a clear effect in terms of grain size refinement provided by the UFH. In particular, the average grain size as obtained by UFH ranges two/three times lower than by a conventional process. The results show the possibility of applying UFH to NGO steels, targeting mechanical properties such as those obtained by the standard process, combined with the benefits from this innovative heat treatment in terms of green energy and the minimization of CO2 emissions. Magnetic characterization performed by a single sheet tester (30 × 90 mm) showed that the values of core losses are comparable with conventional NGO grades.

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Influence of Hot Rolling Condition on the Final Microstructure of Non-Oriented Electrical Steel Fe-3.2 wt.% Si

Cited by 6 publications

References 8 publications

Comprehensive Influence of the Normalized and Final Annealing Process on High‐Strength Nonoriented Silicon Steel

Comprehensive Influence of the Normalized and Final Annealing Process on High‐Strength Nonoriented Silicon Steel

Effect of Cold Rolling Reduction Ratio on Microstructure and Magnetic Properties of Secondary Cold‐Rolled High‐Grade Nonoriented Silicon Steel

Ultra-Fast Heating Treatment Effect on Microstructure, Mechanical Properties and Magnetic Characteristics of Non-Oriented Grain Electrical Steels

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