A model study of thermal characteristics of decarburization annealing furnace for silicon steel strip

Guo, Yue; Dai, Fangqin; Yang, Shouzhou

doi:10.1016/j.applthermaleng.2016.01.008

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…In recent years, there has been extensive exploration and research on the new process of solid-state decarburization steelmaking [5][6][7][8][9][10][11][12]. Among them, numerous decarburization studies [13][14][15][16][17][18][19][20][21] have shown that the surface decarburization reaction of Fe-C alloy is the rate-limiting step in the early stage of decarburization, while the diffusion of carbon atoms from the interior to the interface is the limiting step in the middle stage of decarburization. Both decarburization rate and carbon diffusion rate are linearly related to temperature.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Behavior of Carbon and Silicon in the Process of Preparing Silicon Steel Using Solid-State Decarburization

Wen,

Ai,

Hong

et al. 2023

Processes

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In this study, we investigated the relationship between the decarburization effect of the solid-state decarburization method for preparing silicon steel and the atomic diffusion behavior in the matrix, focusing on 1 mm thick Fe-0.18 wt% C-Si (1.5, 3.5 wt%) alloy strips as the research object. Solid-state decarburization experiments were carried out in an Ar-H2O-H2 atmosphere, and the self-diffusion behavior of C and Si in Fe-C-Si alloy system was simulated by molecular dynamics. The results show that the molecular dynamics simulation results are consistent with the decarburization experimental results. When the temperature is lower than 800 °C, the atoms maintain a compact bcc structure, so the migration rate of carbon is low. When the temperature rises, the atoms move violently, resulting in the destruction of the crystal structure. Because the atomic arrangement tends towards a disordered structure, the migration rate of C is high and the diffusion coefficient increases. The experimental results showed that the decarburization rate was accelerated. At the same temperature, the diffusion activation energy Q = 48.7 kJ·mol−1 of carbon in an Fe-3.5 wt% Si-C alloy matrix can be calculated. The diffusion activation energy of carbon Q = 47.3 kJ·mol−1 was calculated using a molecular dynamics simulation. When the content of Si is 3.5 wt% and 1.5 wt%, the diffusion series of Si can be expressed as D3.5Si, Si = 8.54 × 10−10 exp(−33,089.7/RT) m2/s and D1.5Si, Si = 2.06 × 10−9 exp(−46,641.5/RT) m2/s, respectively. When the Si content is 3.5 wt%, the diffusion coefficient of Si is larger. After diffusion to the near surface, it combines with the remaining O to form a continuous strip of SiO2. When the Si content is 1.5 wt%, the diffusion coefficient of Si is small. The remaining O diffuses in the matrix and will oxidize when encountering Si; it cannot aggregate in a highly-dispersed distribution. The lattice transition from face centered cubic lattice austenite to body centered cubic lattice ferrite occurred in the matrix of the thin strip. The diffusion coefficient of C in ferrite is much larger than that in austenite. Therefore, the decarburization rate suddenly increases before decarburization stagnation. With the increase in Si content, the diffusion activation energy of C decreases, which promotes the decarburization effect.

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Section: Introductionmentioning

confidence: 99%

Diffusion Behavior of Carbon and Silicon in the Process of Preparing Silicon Steel Using Solid-State Decarburization

Wen,

Ai,

Hong

et al. 2023

Processes

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“…Apart from the experimental researches, some theoretical studies have been conducted on the understanding of this phenomenon, its determining factors and their influence on the properties of the steel alloys. For instance, Guo et al [8] proposed a zonal modelling to predict the decarburisation temperature for silicon steel strip and Soenen et al [9] developed a modelling decarburisation in electrical steels.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Guo et al. [8] proposed a zonal modelling to predict the decarburisation temperature for silicon steel strip and Soenen et al. [9] developed a modelling decarburisation in electrical steels.…”

Section: Introductionmentioning

confidence: 99%

A novel approach to prevent decarburisation through electroless plating

Teymoori

Shahidi²,

Taji

et al. 2019

Surface Engineering

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Decarburisation is found as an undesirable consequence of the heat treatment cycle in hot work tool steels. In this work, an increase in the decarburisation resistance of tool steel through the electroless technique is subjected. For this purpose, the surface of the H13 tool steel was deposited by the electrodes Ni-P, Ni-B and Ni-P-B coatings. Since the carbon loss leads to a decrease in the hardness, the micro-hardness method is applied to find the influence of the mentioned coatings on the decarburisation resistance. The measurements show that all the electroless-plated steels possess higher resistance to the loss of carbon compared to the bare surface (as the reference). The results also confirmed that the incorporation of boron in the matrix of the Ni-plated layer, including Ni-B and especially Ni-P-B, prevents metal from decarburisation more effectively. The Ni-P-B coating could reduce the decarburisation depth from 0.15 to 0.035 mm.

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Risk-constrained scheduling of solar Stirling engine based industrial continuous heat treatment furnace

Jabari

Nojavan

Mohammadi‐Ivatloo

et al. 2018

Applied Thermal Engineering

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A model study of thermal characteristics of decarburization annealing furnace for silicon steel strip

Cited by 5 publications

References 5 publications

Diffusion Behavior of Carbon and Silicon in the Process of Preparing Silicon Steel Using Solid-State Decarburization

Diffusion Behavior of Carbon and Silicon in the Process of Preparing Silicon Steel Using Solid-State Decarburization

A novel approach to prevent decarburisation through electroless plating

Risk-constrained scheduling of solar Stirling engine based industrial continuous heat treatment furnace

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