[Influence du comportement du substrat en acier sur la déformation et la fissuration des revêtements Zn–Al–Mg sur les tôles d’acier galvanisées]
The objective of this study is twofold: (i) to comprehensively describe the deformation modes of zinc coatings depending on their crystallographic texture and (ii) to investigate the effect of Lüders banding occurring in the steel substrate on the coating deformation and cracking modes. Microscopic characterization and mechanical tests were conducted on three types of galvanized steel: a mild steel substrate and a high-strength low-alloy (HSLA) steel substrate known to exhibit the Lüders banding phenomenon, and a dual-phase steel substrate. The results reveal a direct correlation between the coating texture, plastic deformation modes, and the mechanical behavior of the respective substrates. Digital Image Correlation (DIC) was employed to measure the strain fields and characterize strain localization phenomena resulting from Lüders banding. The strain field measured on the galvanized substrate specimens showed that Lüders band propagation leads to accelerated plastic deformation and cracking in the Zn–Al–Mg coating. Finite element simulations were performed by considering the real coating microstructure and incorporating the macroscopic behavior of the substrate. The simulation results demonstrate that slip and twinning activities of the coating grains are strongly influenced by the underlying substrate behavior.
L’objectif de cette étude est double : (i) décrire de manière exhaustive les modes de déformation des revêtements de zinc en fonction de leur texture cristallographique et (ii) étudier l’effet des bandes de Lüders se développant dans le substrat en acier sur les modes de déformation et de fissuration du revêtement. Une caractérisation microscopique et des essais mécaniques ont été réalisés sur trois types d’acier galvanisé : un substrat en acier doux, un substrat en acier à haute résistance et faiblement allié (HSLA) connu pour présenter le phénomène de bandes de Lüders, et un substrat en acier à microstructure biphasée (Dual-Phase). Les résultats révèlent une corrélation directe entre la texture du revêtement, les modes de déformation plastique et le comportement mécanique des substrats respectifs. La corrélation d’images numériques (DIC) a été utilisée pour mesurer les champs de déformation et caractériser les phénomènes de localisation associés aux bandes de Lüders. Les champs de déformation mesurés sur les éprouvettes de substrat galvanisé montrent que la propagation des bandes de Lüders entraîne une accélération de la déformation plastique et favorise la fissuration dans le revêtement Zn–Al–Mg. Des simulations par éléments finis ont été réalisées en considérant la microstructure réelle du revêtement et en intégrant le comportement macroscopique du substrat. Les résultats de la simulation démontrent que les mécanismes de glissement et de maclage au sein des grains du revêtement sont fortement influencés par le comportement mécanique du substrat sous-jacent.
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Mots-clés : Revêtements de zinc, Texture cristallographique, Bandes de Lüders, Fissuration du revêtement, Glissement et maclage, Localisation de la déformation, Acier galvanisé
Ahmed Zouari 1, 2, 3 ; Samuel Forest 1 ; Sylvain Dépinoy 1 ; Yazid Madi 1 ; Jean-Michel Mataigne 2 ; Houssem Eddine Chaïeb 4 ; Pascal Bertho 2 ; Aymen Bouzid 2 ; Aurelien Chopin 2 ; Coralie Jung 2
CC-BY 4.0
@article{CRMECA_2025__353_G1_1425_0,
author = {Ahmed Zouari and Samuel Forest and Sylvain D\'epinoy and Yazid Madi and Jean-Michel Mataigne and Houssem Eddine Cha{\"\i}eb and Pascal Bertho and Aymen Bouzid and Aurelien Chopin and Coralie Jung},
title = {Influence of steel substrate behavior on the deformation and cracking of {Zn{\textendash}Al{\textendash}Mg} coatings on galvanized steel sheets},
journal = {Comptes Rendus. M\'ecanique},
pages = {1425--1449},
year = {2025},
publisher = {Acad\'emie des sciences, Paris},
volume = {353},
doi = {10.5802/crmeca.340},
language = {en},
}
TY - JOUR AU - Ahmed Zouari AU - Samuel Forest AU - Sylvain Dépinoy AU - Yazid Madi AU - Jean-Michel Mataigne AU - Houssem Eddine Chaïeb AU - Pascal Bertho AU - Aymen Bouzid AU - Aurelien Chopin AU - Coralie Jung TI - Influence of steel substrate behavior on the deformation and cracking of Zn–Al–Mg coatings on galvanized steel sheets JO - Comptes Rendus. Mécanique PY - 2025 SP - 1425 EP - 1449 VL - 353 PB - Académie des sciences, Paris DO - 10.5802/crmeca.340 LA - en ID - CRMECA_2025__353_G1_1425_0 ER -
%0 Journal Article %A Ahmed Zouari %A Samuel Forest %A Sylvain Dépinoy %A Yazid Madi %A Jean-Michel Mataigne %A Houssem Eddine Chaïeb %A Pascal Bertho %A Aymen Bouzid %A Aurelien Chopin %A Coralie Jung %T Influence of steel substrate behavior on the deformation and cracking of Zn–Al–Mg coatings on galvanized steel sheets %J Comptes Rendus. Mécanique %D 2025 %P 1425-1449 %V 353 %I Académie des sciences, Paris %R 10.5802/crmeca.340 %G en %F CRMECA_2025__353_G1_1425_0
Ahmed Zouari; Samuel Forest; Sylvain Dépinoy; Yazid Madi; Jean-Michel Mataigne; Houssem Eddine Chaïeb; Pascal Bertho; Aymen Bouzid; Aurelien Chopin; Coralie Jung. Influence of steel substrate behavior on the deformation and cracking of Zn–Al–Mg coatings on galvanized steel sheets. Comptes Rendus. Mécanique, Volume 353 (2025), pp. 1425-1449. doi: 10.5802/crmeca.340
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