Kinetics of solid-state decarburization for 3.5% Si electrical steel in CO2–CO atmosphere.
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| Title: | Kinetics of solid-state decarburization for 3.5% Si electrical steel in CO |
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| Authors: | Li, Yaping1 (AUTHOR), Sun, Lingyan1 (AUTHOR), Hong, Lukuo1 (AUTHOR) 544482127@qq.com, Sun, Caijiao1 (AUTHOR), Ai, Liqun1 (AUTHOR), Qian, Na2 (AUTHOR) |
| Source: | Metallurgical Research & Technology. 2026, Vol. 123 Issue 2, p1-11. 11p. |
| Subjects: | Electrical steel, Diffusion kinetics, Chemical kinetics, Silica films, Oxide coating, Steelmaking furnaces |
| Abstract: | In this study, solid-state decarburization experiments were carried out under a CO2–CO atmosphere using 1 mm thick Fe–0.18%C–3.5%Si alloy strips, with a focus on adapting to electric furnace-based short-process steelmaking. The results indicate that within the temperature range of 1273–1433 K, the solid-state decarburization process can be divided into three distinct stages: rapid decarburization (0–10 min), sustained decarburization (10—30 min), and decarburization stagnation (30–50 min). The optimal decarburization performance was achieved at 1423 K, where the final carbon content was reduced to 0.009%. However, as the reaction proceeded, a SiO2 oxide layer gradually thickened on the surface and developed trench-like morphologies, which progressively blocked carbon diffusion pathways and eventually led to decarburization stagnation. Kinetic analysis revealed that during the first 10 min of decarburization at various temperatures, carbon diffusion was the primary rate-limiting step, following an apparent first-order reaction model. Concurrently, the oxide layer thickness increased rapidly during this period, exhibiting a strong correlation with the square root of decarburization time, consistent with a diffusion-controlled growth mechanism. Beyond 10 min, the growth rate of the oxide layer slowed and followed a linear relationship with time, indicating a transition to a mixed control regime governed by both carbon diffusion and oxide layer growth. The evolution of oxide layer thickness and morphology—particularly the formation of trench-like structures—directly altered the resistance to carbon diffusion. In the early stage, a thin oxide layer permitted rapid decarburization dominated by carbon diffusion. In the later stages, however, the thickening of the oxide layer impeded diffusion channels, triggering decarburization stagnation governed by mixed control. As a result, the carbon content versus time relationship gradually shifted toward a linear trend, with a decarburization stagnation line emerging once the oxide layer completely inhibited further reaction. Within the temperature range of 1413–1433 K, the oxide growth rate and carbon diffusion rate achieved a favorable balance, resulting in a dynamic mixed-control mechanism. This synergy minimized resistance while sustaining sufficient diffusion, thereby maximizing the overall decarburization efficiency. [ABSTRACT FROM AUTHOR] |
| Copyright of Metallurgical Research & Technology is the property of EDP Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 192633492 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Kinetics of solid-state decarburization for 3.5% Si electrical steel in CO<subscript>2</subscript>–CO atmosphere. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Li%2C+Yaping%22">Li, Yaping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+Lingyan%22">Sun, Lingyan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hong%2C+Lukuo%22">Hong, Lukuo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> 544482127@qq.com</i><br /><searchLink fieldCode="AR" term="%22Sun%2C+Caijiao%22">Sun, Caijiao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ai%2C+Liqun%22">Ai, Liqun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qian%2C+Na%22">Qian, Na</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Metallurgical+Research+%26+Technology%22">Metallurgical Research & Technology</searchLink>. 2026, Vol. 123 Issue 2, p1-11. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Electrical+steel%22">Electrical steel</searchLink><br /><searchLink fieldCode="DE" term="%22Diffusion+kinetics%22">Diffusion kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Silica+films%22">Silica films</searchLink><br /><searchLink fieldCode="DE" term="%22Oxide+coating%22">Oxide coating</searchLink><br /><searchLink fieldCode="DE" term="%22Steelmaking+furnaces%22">Steelmaking furnaces</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In this study, solid-state decarburization experiments were carried out under a CO2–CO atmosphere using 1 mm thick Fe–0.18%C–3.5%Si alloy strips, with a focus on adapting to electric furnace-based short-process steelmaking. The results indicate that within the temperature range of 1273–1433 K, the solid-state decarburization process can be divided into three distinct stages: rapid decarburization (0–10 min), sustained decarburization (10—30 min), and decarburization stagnation (30–50 min). The optimal decarburization performance was achieved at 1423 K, where the final carbon content was reduced to 0.009%. However, as the reaction proceeded, a SiO2 oxide layer gradually thickened on the surface and developed trench-like morphologies, which progressively blocked carbon diffusion pathways and eventually led to decarburization stagnation. Kinetic analysis revealed that during the first 10 min of decarburization at various temperatures, carbon diffusion was the primary rate-limiting step, following an apparent first-order reaction model. Concurrently, the oxide layer thickness increased rapidly during this period, exhibiting a strong correlation with the square root of decarburization time, consistent with a diffusion-controlled growth mechanism. Beyond 10 min, the growth rate of the oxide layer slowed and followed a linear relationship with time, indicating a transition to a mixed control regime governed by both carbon diffusion and oxide layer growth. The evolution of oxide layer thickness and morphology—particularly the formation of trench-like structures—directly altered the resistance to carbon diffusion. In the early stage, a thin oxide layer permitted rapid decarburization dominated by carbon diffusion. In the later stages, however, the thickening of the oxide layer impeded diffusion channels, triggering decarburization stagnation governed by mixed control. As a result, the carbon content versus time relationship gradually shifted toward a linear trend, with a decarburization stagnation line emerging once the oxide layer completely inhibited further reaction. Within the temperature range of 1413–1433 K, the oxide growth rate and carbon diffusion rate achieved a favorable balance, resulting in a dynamic mixed-control mechanism. This synergy minimized resistance while sustaining sufficient diffusion, thereby maximizing the overall decarburization efficiency. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Metallurgical Research & Technology is the property of EDP Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1051/metal/2026016 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 1 Subjects: – SubjectFull: Electrical steel Type: general – SubjectFull: Diffusion kinetics Type: general – SubjectFull: Chemical kinetics Type: general – SubjectFull: Silica films Type: general – SubjectFull: Oxide coating Type: general – SubjectFull: Steelmaking furnaces Type: general Titles: – TitleFull: Kinetics of solid-state decarburization for 3.5% Si electrical steel in CO2–CO atmosphere. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Li, Yaping – PersonEntity: Name: NameFull: Sun, Lingyan – PersonEntity: Name: NameFull: Hong, Lukuo – PersonEntity: Name: NameFull: Sun, Caijiao – PersonEntity: Name: NameFull: Ai, Liqun – PersonEntity: Name: NameFull: Qian, Na IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: 2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 22713646 Numbering: – Type: volume Value: 123 – Type: issue Value: 2 Titles: – TitleFull: Metallurgical Research & Technology Type: main |
| ResultId | 1 |
