Cracking behavior and formability of Zn-Al-Mg coatings: Understanding the influence of steel substrates

Ahmadi, Masoud; Salgın, Bekir; Kooi, Bart J.; Pei, Yutao

doi:10.1016/j.matdes.2021.110215

Cited by 21 publications

(3 citation statements)

References 40 publications

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“…The coating parameters need to be correctly selected to provide sufficient formability. Especially Zn Mg/Al coatings are prone to cracking, which was studied in detail by Ahmadi et al (2021);Salgin et al, (2022). The importance of capturing this phenomenon and its importance also plays a role in simulations of forming, where it is very hard to take this effect into account.…”

Section: Discussionmentioning

confidence: 97%

Limit State of Bake Hardened Stamped Interstitial-free Steel Automotive Parts Caused by Local Thickness Reduction

Klejch,

Schmidová

2024

Period. Polytech. Transp. Eng.

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Current trends in the complex shapes of modern automobiles lead to the need for extremely formable materials for deep drawing applications. In general Interstitial–Free (IF) steels present the solution for this purpose. In addition, the cold stamping process is influenced by a variety of input factors that must be correctly adjusted. An imperfection in one of the inputs may cause stamping defects even with deep drawing materials. Limit states may then appear in the form of cracks or unacceptable thinning in the critically stressed areas of the stamped parts. For this reason, a general focus is placed on the use of non-destructive methods and inspection of stamped parts after stamping for potential subsequent modification of the stamping process. The presented work deals with the material analyses of stamped parts made of Bake-Hardened Interstitial-Free steel, including the local thickness reduction of the material, leading to the occurrence of crack propagation. The focus of the work was placed on the critical influencing factors resulting from the limit states presented. The evaluation of the material flow and the local plastic response was carried out using a cylindrical indentation method. In addition, the SEM analyses showed the importance of the deformation capacity of the surface coating which proved to be one of the decisive parameters for the occurrence of limit states.

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Section: Discussionmentioning

confidence: 97%

Limit State of Bake Hardened Stamped Interstitial-free Steel Automotive Parts Caused by Local Thickness Reduction

Klejch,

Schmidová

2024

Period. Polytech. Transp. Eng.

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“…The tensile experiments show that TiAlN has a higher fracture toughness than VAlN, which was confirmed using micro-bending beam fracture experiments. Ahmadi et al [67] studied the effect of underlying steel substrates on the fracture behavior of Zn-Al-Mg coatings throughout in situ testing. To monitor the dynamic evolution of damage, real-time tensile and bending tests have been performed inside SEM.…”

Section: In Situ Tensile Testing Of Coatingsmentioning

confidence: 99%

A Review on In Situ Mechanical Testing of Coatings

et al. 2022

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Real-time evaluation of materials’ mechanical response is crucial to further improve the performance of surfaces and coatings because the widely used post-processing evaluation techniques (e.g., fractography analysis) cannot provide deep insight into the deformation and damage mechanisms that occur and changes in coatings’ material corresponding to the dynamic thermomechanical loading conditions. The advanced in situ examination methods offer deep insight into mechanical behavior and material failure with remarkable range and resolution of length scales, microstructure, and loading conditions. This article presents a review on the in situ mechanical testing of coatings under tensile and bending examinations, highlighting the commonly used in situ monitoring techniques in coating testing and challenges related to such techniques.

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“…However, partial studies show that due to the relatively poor stress-strain behavior of MgZn 2 , it is easy to produce cracks during deformation processing, which leads to a decrease in the material performance. Therefore, controlling the MgZn 2 phase in the coating is a key factor for the coating properties [16,17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Al/Mg Ratio on the Microstructure and Phase Distribution of Zn-Al-Mg Coatings

Zhang,

Zhao

et al. 2023

Metals

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In contrast with studies such as those on the effect of a single elemental variable on Zn-Al-Mg coatings, Mg/Al is considered a variable parameter for evaluating the microstructure of Zn-Al-Mg coatings in this work, and the combined effect of the two elements is also taken into account. The Mg/Al ratios in the continuous hot-dip plating of low-alumina Zn-Al-Mg coatings were 0.63, 0.75, 1.00, 1.25, and 1.63. respectively, and the microstructures of the different coatings were observed using scanning electron microscopy (SEM). The surface elemental distributions of the coatings were analyzed with energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) analysis to understand the phase distributions of the coatings, which mainly consisted of a zinc monomeric phase, a binary eutectic phase (Zn/MgZn2), and a ternary eutectic phase (Zn/Al/MgZn2). Statistical calculations of the phase distributions in colored SEM images were performed using ImageJ-win64 software, comparative analysis of the solidification simulation results was carried out with thermodynamic simulation software (PANDAT-2023), and evaluation of the corrosion resistance of the platings was performed using macroscopic cyclic immersion corrosion experiments. The results show that with the increase in the Mg/Al ratio, the binary eutectic phase in the coatings gradually increased, the variation trend of the ternary eutectic phase was not obvious, and the corrosion resistance of the coatings gradually improved.

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Cracking behavior and formability of Zn-Al-Mg coatings: Understanding the influence of steel substrates

Cited by 21 publications

References 40 publications

Limit State of Bake Hardened Stamped Interstitial-free Steel Automotive Parts Caused by Local Thickness Reduction

Limit State of Bake Hardened Stamped Interstitial-free Steel Automotive Parts Caused by Local Thickness Reduction

A Review on In Situ Mechanical Testing of Coatings

Effect of Al/Mg Ratio on the Microstructure and Phase Distribution of Zn-Al-Mg Coatings

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