Analysis of an uncommon coating defect on industrial galvannealed high strength interstitial free steel

Chakraborty, Anindita; Dutta, Moumita; Pais, R.; Ray, R.K.

doi:10.1016/j.surfcoat.2010.04.020

Cited by 17 publications

(5 citation statements)

References 11 publications

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“…Materials 2024, 17, x FOR PEER REVIEW 3 of 13 exhibited in Figure 1. It consisted of a mold oscillator system (1), water cooling system (2), copper mold (3,4), heating furnace (5,6,7,8), control/acquisition system (9) and shell withdrawal (extractor) device (10). It has been successfully used to study the initial solidification of molten steel in casting mold; the details of the high-temperature mold simulator system have been presented in a previous paper [18].…”

Section: Mold Simulatormentioning

confidence: 99%

“…Interstitial-free (IF) steel, with a high plastic strain ratio, low yield strength, good formability and high strain rate sensitivity, is widely used for car body panels, such as hoods or doors [ 1 , 2 ]. Except mechanical properties, a high surface quality that is defect-free is also a necessary requirement for IF steel [ 3 , 4 ]. In the process of continuous casting, the mold flux floating on the top of molten steel can be entrapped into the shell and leads to a slag entrapment in the slab [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Mold Flux Entrapment in Deep Oscillation Mark of Interstitial-Free Steel Shell Using Mold Simulator

Yan,

Wang,

Zhou

et al. 2024

Materials

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The slag entrapment defect has become a big issue for the IF steel casting process. In this study, the mechanism of mold flux entrapment in deep oscillation mark of an IF steel shell was studied by a high-temperature mold simulator. Results show that both temperature and heat flux in a copper mold become lower when mold flux B with lower melting and viscosity is used, compared with these when mold flux A with higher melting and viscosity is used. The average thickness of the slag film for mold fluxes A and B is 1.31 mm and 1.63 mm, and the consumption of them is 0.33 kg/m2 and 0.35 kg/m2, respectively. The shell for mold flux A exhibits sharper oscillation marks, while the shell for mold flux B has shallower oscillation marks. These deeper oscillation marks capture the mold flux by overflow of molten steel at the meniscus, which finally produces the slag entrapment defect in the shell.

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Section: Mold Simulatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Mold Flux Entrapment in Deep Oscillation Mark of Interstitial-Free Steel Shell Using Mold Simulator

Yan,

Wang,

Zhou

et al. 2024

Materials

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“…Although these defects have been named differently by various researchers, they display similar characteristics and patterns. For example, these defects align in the direction parallel to the coating direction [6], they are approximately 10 μm deep, and they can be easily detected after the galvanising process because zinc can render invisible defects visible to the naked eye. To understand the root cause and mechanism of these defects, many researchers have investigated the coated surface of industrial galvanised IF steel at different production stages using various detection technologies, such as scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) analysis, and crystallographic texture analysis.…”

Section: Introductionmentioning

confidence: 99%

Isothermal oxidation of interstitial-free steel in air at different temperatures

2017

Corrosion Engineering, Science and Technology

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The oxidation behaviour of interstitial-free (IF) steel at high temperatures was evaluated at 868, 977, 1087, and 1200°C in air for 120 s. Scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction analysis were performed to investigate the cross-sectional morphologies, microstructures, and phase constituents of IF steel after isothermal oxidation. Kinetic results showed that the weight gains of IF steel increased with increasing temperature and exhibited an exponential relationship with temperature. Linear and parabolic laws were found to exist in the weight gain process. The activation energy was 89.12 and 274.12 kJ mol −1 during the linear and parabolic stages, respectively. Non-adherent scales were formed on the substrates of IF steel. FeO was determined to be the major component based on the iron-oxygen atom ratios of the scales after oxidation at different temperatures.

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“…In order to lower the auto body weight for reducing fuel consumption and to reduce greenhouse gas emission without deteriorating crashworthiness, the auto industries prefer to use thinner gauge high strength steels for auto body parts. To guarantee their use as auto body parts, corrosion resistance has to be assured by zinc coating [1] . As the sheet is drawn out of the bath, delicately controlled high pressure air knives blow specific amounts of the liquid zinc from steel substrate [2] .…”

Section: Introductionmentioning

confidence: 99%

Coating Thickness Controlled by Different Protective Atmospheres for A Hot Dipped 0.7mm Thin Steel Slab

Fang¹,

Wang²,

Du³

et al. 2016

Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016)

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The zinc based coating weight and thickness under different protective atmospheres and zinc bath chemistries were studied in laboratory by HDPS (hot dipping process simulator). The results show that, the coating had a good adhesion on matrix with no leakage and micro crack, the binder course of coating and matrix was smooth and continue. The coating weight and thickness decreased with increasing hydrogen content in furnace, but changed little for zinc bath chemistry of 0.29%Al-Zn when hydrogen content increased from 10 to 20%, they were almost the same except hydrogen was 5%. The coating weight increased significantly with increasing aluminium content solved in zinc bath, when protective atmosphere was conducted on 20% H 2 appeared the largest gap of coating weight between the two zinc chemistries.

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Analysis of an uncommon coating defect on industrial galvannealed high strength interstitial free steel

Cited by 17 publications

References 11 publications

Investigation of Mold Flux Entrapment in Deep Oscillation Mark of Interstitial-Free Steel Shell Using Mold Simulator

Investigation of Mold Flux Entrapment in Deep Oscillation Mark of Interstitial-Free Steel Shell Using Mold Simulator

Isothermal oxidation of interstitial-free steel in air at different temperatures

Coating Thickness Controlled by Different Protective Atmospheres for A Hot Dipped 0.7mm Thin Steel Slab

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