Characterization of hot-dip galvanized coating on dual phase steels

Liu, Huachu; Li, Fang; Wen, Shu Wen; Liu, Rendong; Li, Lin

doi:10.1016/j.surfcoat.2010.12.028

Cited by 11 publications

(6 citation statements)

References 14 publications

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“…The internal oxide particles are distributed in a region about 150 nm below the surface. The internal oxides were observed previously in high strength steels [7,11,12,13,14]. At a higher magnification, right between the inhibition layer and the surface of the steel substrate is another thin layer, which is evident by the different contrast, as shown in Figure 4b (indicated by the pairs of arrows).…”

Section: Resultssupporting

confidence: 70%

“…Oxidation may occur both externally and internally depending upon the oxidizing potential inside the annealing furnace [11,12,13,14]. Thus, understanding the structure of the interface of galvanized high strength steels is crucially important.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, understanding the structure of the interface of galvanized high strength steels is crucially important. How these oxides affect galvanizing of AHSSs has been the subject of extensive discussions [7,8,9,10,11,12,13,14] most recently.…”

Section: Introductionmentioning

confidence: 99%

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Transmission electron microscopy characterization of the interfacial structure of a galvanized dual-phase steel

Aslam

Martens

et al. 2016

Materials Characterization

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Site-specific studies were carried out to characterize the interface of a galvanized dual-phase (DP) steel. Focused ion beam (FIB) was used to prepare specimens the interface region (~100 nm thick) between the coating and the substrate. Transmission electron microscopy (TEM), scanning TEM (STEM) and high resolution TEM (HRTEM) were performed to resolve the phases and the structures at the interface between the zinc (Zn) coating and the steel substrate. The STEM and TEM results showed that a continuous manganese oxide (MnO) film with a thickness of ~20 nm was present on the surface of the substrate while no silicon (Si) oxides were resolved. Internal oxide particles were observed as well in the sub-surface region. Despite the presence of the continuous oxide film, a well-developed inhibition layer was observed right on top of the oxide film. The inhibition layer has a thickness of ~100 nm. Possible mechanisms for the growth of the inhibition layer were discussed.

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Section: Resultssupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

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Transmission electron microscopy characterization of the interfacial structure of a galvanized dual-phase steel

Aslam

Martens

et al. 2016

Materials Characterization

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“…1,2) The superior corrosion resistance provided by the hot-dip Zn galvanizing process is being applied to high strength multi-phase steels such as dual-phase (DP) steels with two microstructural constituents of martensite and ferrite. [2][3][4][5][6][7] One of the important issues in the application of the hot-dip galvanizing process to high strength steels is a sufficient adhesiveness of the Zn coating layer on the steel sheet. It is generally known that the Fe-Zn intermetallic phases [8][9][10] are formed at the interface between the Zn coating and the steel sheet 1) and that they are often brittle due to the difficulty of slip deformation at ambient temperature, 11,12) whereby it is essential to control the formation of the Fe-Zn intermetallic phase layers.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Interfacial Reaction of Fe–Si Alloy Sheets Hot-Dipped in Zn Melt at 460°C

et al. 2018

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In order to understand the effect of solute Si (in the steel sheet) on the interfacial reaction between liquid Zn and solid Fe (α-Fe phase) during the hot-dip galvanizing process, a change in the interfacial microstructure between Zn coating and Fe substrate in Fe-Si alloy sheets hot-dipped in Zn melt with dipping time at 460°C was examined. In pure Fe sheet, the Fe-Zn intermetallic layers form at the interface between solid Fe and liquid Zn at an early stage of dipping and subsequently grow to approximately 60 μm in thickness after 600 s. In Fe-1Si (wt%) alloy, the thickness of Zn coating substantially increases to beyond 500 μm after 600 s and the coarse ζ-FeZn 13 phase with several facet planes was often observed in the Zn coating. The thickness of the Fe-1Si alloy sheets continuously decreases till 60 s and then is reduced significantly after 600 s. The thickness loss in the later stage of dipping is more significant in the Fe-Si alloy with higher Si content. These results indicate a significant Fe dissolution into liquid Zn could occur at the later stage of dipping the Fe-1Si alloy in Zn melt, which is distinguished from the interfacial reaction between pure Fe and liquid Zn. The enhanced interfacial reaction would be responsible for the decomposition of the initially formed ζ-FeZn 13 phase layer to liquid and FeSi phases, which can be proposed based on thermodynamic calculations of the Fe-Zn-Si ternary system.

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“…[8][9][10] Conventional continuous hot-dipping galvanizing process 6) involves heating steel sheet/strip to around 800°C in a N 2 /H 2 reducing atmosphere prior to immersion in a Zn bath. [11][12][13][14][15][16] However, for this same process to be applied to the fabrication of an Al alloy coating dual-phase steels, it is necessary to control the steel microstructure through a sequence of heating and cooling during the hot-dipping process. A representative heat profile for the hot-dipping of an Al-Mg-Si alloy coating and the time-temperaturetransformation (TTT) diagram for a plain low-carbon steel are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Control of Dual-Phase Steels through Hot-Dip Al–Mg–Si Alloy Coating Process

et al. 2016

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This study investigates the γ→α transformation kinetics of Fe-Mn-C dual-phase steels at a temperature above the melting point of an Al-8.2Mg-4.8Si (wt.%) alloy coating formed on their surface by hot-dipping process. Using an experimentally determined time-temperature-transformation (TTT) diagram for a model steel of Fe-1.5Mn-0.1C (wt.%), the volume fraction of martensite is controlled through the intercritical heat treatment incorporated into the hot-dipping process. The microstructural observations confirm that this combined process route makes it possible to fabricate hot-dipped Al alloy-coated dual-phase steels with a controlled microstructure.

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Characterization of hot-dip galvanized coating on dual phase steels

Cited by 11 publications

References 14 publications

Transmission electron microscopy characterization of the interfacial structure of a galvanized dual-phase steel

Transmission electron microscopy characterization of the interfacial structure of a galvanized dual-phase steel

Enhanced Interfacial Reaction of Fe–Si Alloy Sheets Hot-Dipped in Zn Melt at 460°C

Microstructure Control of Dual-Phase Steels through Hot-Dip Al–Mg–Si Alloy Coating Process

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