Designing mould fluxes to prevent longitudinal cracking for peritectic steel slab casting

Klug, Jeferson L.; Medeiros, Samuel L. S.; Matos, Kelley T.; Azevedo, Carlos A.; Maranhão, Edson A.; Ferreira, José A. C.

doi:10.1080/03019233.2023.2250047

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…From the perspective of the formation of longitudinal cracks, a significant amount of research has been carried out. The initial location of a longitudinal crack is close to the meniscus in the mold and its formation is related to many factors such as mold powder, the steel composition and mold level fluctuation [9][10][11][12][13]. If the local stress is considerable under the action of some unsuitable casting parameters, a longitudinal crack occurs [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Recognition of Longitudinal Cracks on Slab Surfaces Based on Particle Swarm Optimization and eXtreme Gradient Boosting Model

Liu,

Jiang,

Shi

et al. 2024

Processes

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Longitudinal cracks are a common defect on the surface of continuous casting slabs, and cause increases in additional processing costs or long-time interruptions. The accurate identification of surface longitudinal cracks is helpful to ensure the casting process is adjusted in time, which significantly improves the quality of slabs. In this research, the typical temperature characteristics of thermocouples at the position of longitudinal cracks and their adjacent locations were extracted. The principal component analysis (PCA) method was used to reduce the dimensions of these characteristics to remove the redundant information. The particle swarm optimization (PSO) method was introduced to optimize the parameter. On this basis, a recognition model of surface longitudinal cracks was established, based on a particle swarm optimization–eXtreme gradient boosting (XGBOOST) model. Finally, this model was trained and tested using longitudinal crack and non-longitudinal crack samples and compared with the decision tree, the gradient boosting decision tree (GBDT) and XGBOOST models. The test results showed that PSO-XGBOOST had the best identification performance in all evaluation indexes. The accuracy, F1 score and alarm rate results were 95.8%, 92.3% and 100%, respectively, and the false alarm rate was as low as 5.5%. The research results provide a theoretical basis and a reliable model for surface longitudinal crack identification.

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Section: Introductionmentioning

confidence: 99%

Recognition of Longitudinal Cracks on Slab Surfaces Based on Particle Swarm Optimization and eXtreme Gradient Boosting Model

Liu,

Jiang,

Shi

et al. 2024

Processes

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Effect of depressions on the three-dimensional propagation of longitudinal surface crack in continuous casting strands of hypo-peritectic steel

Peng,

Hou,

Cen

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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Surface depressions are common defects in the continuous casting process of hypo-peritectic steel, categorised into transverse and longitudinal depressions. While the formation processes of these depressions are well understood, their influence on the propagation of longitudinal surface cracks remains unclear. This study developed a new method for large-area surface depth measurement of the strand based on optical focusing. Utilising this method, we investigated the impact of surface depressions on the three-dimensional propagation of longitudinal surface crack in terms of width, depth and casting direction through macrostructure characteristics and finite element static analysis. The results indicated that transverse and longitudinal depressions affect crack propagation differently. Specifically, the depth of longitudinal depressions increases crack width, while transverse depressions can inhibit it to some extent. Macrostructure analysis of the cross-section revealed a continuous segregation line at the bottom of the depression, closely related to heat transfer, thermal stress, and the flow of solute-enriched liquid steel. Statistical analysis indicated that the depth of longitudinal depressions significantly affects the length of the segregation line, which in turn influences crack depth. However, no surface cracks were found at the bottom of transverse depressions adjacent to longitudinal depressions. This may be due to the banded grains at the bottom of transverse depressions resisting tensile thermal stress parallel to the strand's width direction. Along the casting direction, crack propagation primarily occurs along the bottom of longitudinal depressions due to continuous thermal disturbances at the meniscus. Meanwhile, the transverse depression can restrict the propagation of the existing crack while promoting the formation of the new crack at the other site. Finally, the study proposed mechanisms by which depressions influence the propagation of the longitudinal surface crack. This research further elucidates the impact patterns of surface depressions on macrostructure and stress distribution and how these factors subsequently influence crack propagation in three dimensions. It underscores the importance of controlling surface depressions to mitigate the longitudinal surface crack.

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Uma Revisão Bibliográfica Sobre Pós Fluxantes Sem Flúor Para Aços Peritéticos Com Base No Sistema De Escórias Cao-Sio2-Na2o-B2o3

KLUG,

NICOLODI,

PEREIRA

et al. 2024

ABM Proceedings

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Designing mould fluxes to prevent longitudinal cracking for peritectic steel slab casting

Cited by 3 publications

References 22 publications

Recognition of Longitudinal Cracks on Slab Surfaces Based on Particle Swarm Optimization and eXtreme Gradient Boosting Model

Recognition of Longitudinal Cracks on Slab Surfaces Based on Particle Swarm Optimization and eXtreme Gradient Boosting Model

Effect of depressions on the three-dimensional propagation of longitudinal surface crack in continuous casting strands of hypo-peritectic steel

Uma Revisão Bibliográfica Sobre Pós Fluxantes Sem Flúor Para Aços Peritéticos Com Base No Sistema De Escórias Cao-Sio2-Na2o-B2o3

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