A Study on the Resolution of Pin-dent Defects in Automotive Door Panels

Roy, Tapas Kumar; Balakrishnan, Vishalache; Suresh, Shainu

doi:10.1007/s11668-020-01085-4

J Fail. Anal. and Preven.

2021

DOI: 10.1007/s11668-020-01085-4

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A Study on the Resolution of Pin-dent Defects in Automotive Door Panels

Tapas Kumar Roy

Vishalache Balakrishnan

Shainu Suresh

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Cited by 2 publications

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Optimization of Vortex Slag Entrainment during Ladle Teeming Process in the Continuous Casting of Automobile Outer Panel

Zhou,

Li,

Deng

et al. 2024

steel research int.

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With the thinner of the automobile panel, the press crack defects caused by the large‐size calcium aluminate inclusions at the automakers become obvious. Herein, in order to stabilize the control of calcium aluminate inclusions in the molten steel, the vortex slag entrainment (VSE) of a 300 ton ladle is investigated by the numerical simulation. The effects of the steel throughput, cofferdam height close to the nozzle, and ladle bottom structure on the VSE are analyzed. Results demonstrate that the residual molten steel (RMS) in the ladle and the critical height of the vortex increase with the increasing of the steel throughput. The RMS increases with the increasing of the cofferdam height when the VSE occurs. When the cofferdam height is 50, 100, and 150 mm, the RMS are 4.71, 7.19, and 9.62 t at the initial time of the VSE with a 7.5 ton min−1 steel throughput. In addition, the industrial trial of transforming the flat bottom ladle into the slope bottom ladle is carried out to control the VSE and reduce the RMS. The average weight of the RMS after pouring 25 heats of the slope ladle bottom ladle is 1.85 t less than that of the flat bottom ladle.

show abstract

Optimization of Vortex Slag Entrainment during Ladle Teeming Process in the Continuous Casting of Automobile Outer Panel

Zhou,

Li,

Deng

et al. 2024

steel research int.

View full text Add to dashboard Cite

show abstract

Formation mechanism of point-like defect in IF steel sheet during deep drawing process

Deng

et al. 2022

Metall. Res. Technol.

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In the current study, the three-dimensional morphology of a typical point-like defect in deep drawing IF steel sheets was characterized by step machining method, and the corresponding casting parameters and stopper tip clogs were also analyzed. The results show that the defect contains two parts: single alumina refractory grain and alumina clusters. Furthermore, the actual size of inclusion in the defect using the 3D characterization was determined to about 1 mm, much larger than that only from surface evaluation (~ 0.1 mm). Based on clog analysis and tracing casting parameters, the formation mechanism of defect during the whole production process was proposed. The defect may originates from the occasional dislodging of stopper tip deposits in the tundish level rising period of ladle exchange process where the entrapped FeO rich ladle slag into the tundish and temperature drop worsen the clogging. Therefore, elimination of ladle slag entrapment and stabilization of steel temperature in the tundish during ladle change procedures help to eliminate the point-like defect of steel sheets for deep drawing purpose.

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A Study on the Resolution of Pin-dent Defects in Automotive Door Panels

Cited by 2 publications

References 2 publications

Optimization of Vortex Slag Entrainment during Ladle Teeming Process in the Continuous Casting of Automobile Outer Panel

Optimization of Vortex Slag Entrainment during Ladle Teeming Process in the Continuous Casting of Automobile Outer Panel

Formation mechanism of point-like defect in IF steel sheet during deep drawing process

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