Effect of hydrogen content in the final annealing atmosphere on secondary recrystallization of grain-oriented Si steel

Takamiya, Toshito; Kurosawa, M.; Komatsubara, Michiro

doi:10.1016/s0304-8853(02)00832-6

Cited by 13 publications

(13 citation statements)

References 5 publications

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“…To improve the {11 0} /0 0 1S alignment, a great number of experiments had been performed [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43], and many measures have been employed in the process of production of grain-oriented electrical steels.…”

Section: The Technology Of Productionmentioning

confidence: 99%

Developments in the production of grain-oriented electrical steel

Xia

Kang

Wang

2008

Journal of Magnetism and Magnetic Materials

162

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Section: The Technology Of Productionmentioning

confidence: 99%

Developments in the production of grain-oriented electrical steel

Xia

Kang

Wang

2008

Journal of Magnetism and Magnetic Materials

162

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“…The reason may be that Brass oriented grains and Goss oriented grains both have low energy plane of {110} and thus compete very strongly in the abnormal growth process. [16,17] The average deviation angle between abnormally grown grain orientations and Goss orientation is calculated to be about 108 which is caused by {210}<001> grains and Brass oriented grains neighboring Goss grains. In spite of poor quality of abnormally grown grains by continuous annealing, the most important is the lowest cost, namely, the low heating temperature of slab by 1200 8C, the omitting of normalization annealing, and first of all the continuous annealing time within 10 min.…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, Goss orientation often rotates around the RD axis in DR3 sample. The reason may be that Brass oriented grains and Goss oriented grains both have low energy plane of {110} and thus compete very strongly in the abnormal growth process . The average deviation angle between abnormally grown grain orientations and Goss orientation is calculated to be about 10° which is caused by {210}<001> grains and Brass oriented grains neighboring Goss grains.…”

Section: Resultsmentioning

confidence: 99%

Low-Cost Grain Oriented Silicon Steels Manufactured by Continuous Annealing

Jiao

Yang

Zhang

et al. 2016

steel research int.

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Low-cost grain oriented silicon steel produced by continuous annealing, low slab-heating temperature, and omitting normalization annealing is explored and analyzed. This type of grain oriented steel is designed to replace the non-oriented steels used for the production of transformers of medium and small sizes as specified in all GO steel producers catalogs. Fully secondarily recrystallized structure with magnetic properties of P1.7 ¼ 2.04 W kg À1 and B8 ¼ 1.76 T is obtained at temperature of 1050 8C within 10 min in the condition of two-stage cold rolling, whereas one-stage cold rolling method fails to initiate abnormal grain growth in the same processing parameters. The success of fully secondary recrystallization using two-stage cold rolling method is ascribed to the more important role of sufficient amount of Goss seeds in decarburized samples as in CGO steels than the stronger {111}<112> texture as in HiB silicon steels. It is further determined that by two-stage cold rolling technique, a higher secondary stage rolling reduction leads to a lower secondary recrystallization starting temperature and a shorter secondary recrystallization staring time related with a finer grain size. The reasons for the high iron core loss related by continuous annealing are connected to the higher number of deviated Goss grains scattering toward {210}<001> or Brass orientations, the residual inhibitors and the imperfect grain size and morphologies. The reasons for the failure in abnormal grain growth by one-stage rolling are also discussed.

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“…For AlN inhibitors, AlN precipitation is inhibited in 0.23-and 0.30-mm thick oriented silicon steels, and secondary recrystallization temperature increases at high N 2 partial pressure 19) . By contrast, the secondary recrystallization tempera-ture would be lower and AlN is more likely to decompose at a lower temperature as the N 2 partial pressure becomes lower 23) . A study on the evolution behavior of AlN particles under different atmosphere conditions showed that more N atoms will be lost from the matrix, and AlN particles are more likely to coarsen at 920 C with prolonged treatment at lower N 2 partial pressure 27) .…”

Section: Introductionmentioning

confidence: 97%

“…In the inherent inhibitor method, the AlN particle is mainly derived from the precipitation in the normalized stage 7) . Meanwhile, under the 25%H 2 +75%N 2 (volume fraction, vol%) annealing atmospheric condition in the nal annealing process, AlN particles start to ripen at 900 C and lose inhibition ability below 980 C 23) . For the acquired inhibitor method, due to the initial alloy composition, the formation of large amount of AlN particles mainly depends on the decomposition and transformation of Si 3 N 4 formed by nitriding treatment as temperature reaches more than 700 C in the nal annealing process 24,25) .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Annealing Atmosphere on the Evolution Behavior of Inhibitors in Thin-Gauge Grain-Oriented Silicon Steel

Yang¹,

Meng

et al. 2017

Mater. Trans.

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In this paper, 0.18 mm thin-gauge S-type steels with MnS and N-type steels with AlN as main inhibitors, respectively, were fabricated using three different nal annealing systems. Moreover, the evolution behavior of the MnS and AlN [(Al, Si)N] particles and grain orientation were investigated. Number density and mean diameter of second-phase particles were statistically determined by eld-emission scanning electron microscopy. Results indicated that evolution of MnS and AlN would be suppressed with increased N 2 content during annealing. The onset ripening temperature of MnS was lower than that of AlN particle, which caused secondary recrystallization in the S-type samples at lower temperature compared with that of the N-type samples. Moreover, for the N-type steel fabricated by nitriding method, the effective inhibitor was (Al, Si)N formed by the decomposition of (Al, Mn, Si)N. The decomposition of (Al, Mn, Si)N particles and coarsening of (Al, Si)N inhibitors were strongly inhibited and delayed with increased N 2 content in annealing atmosphere. In conclusion, N 2 /H 2 ratio of annealing atmosphere could be an effective control parameter to enhance the inhibition ability and delay secondary recrystallization onset in forming sharp Goss texture.

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Effect of hydrogen content in the final annealing atmosphere on secondary recrystallization of grain-oriented Si steel

Cited by 13 publications

References 5 publications

Developments in the production of grain-oriented electrical steel

Developments in the production of grain-oriented electrical steel

Low-Cost Grain Oriented Silicon Steels Manufactured by Continuous Annealing

The Effect of Annealing Atmosphere on the Evolution Behavior of Inhibitors in Thin-Gauge Grain-Oriented Silicon Steel

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