Cross-sectional observation of the intermetallic phase in a galvannealed steel

Kao, Fang-Hsin; Li, W.C.; Chen, C.Y.; Huang, Chenyang; Yang, Jer−Ren; Wang, S.H.

doi:10.1016/j.msea.2008.04.072

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…ORs between various Fe-Zn IMCs were reported to be present in some TEM studies of the galvannealed coating [7,12,13] but not in others [11,[14][15][16][17] of the galvannealed coating. The major reason can be attributed to the inhomogeneous local Fe-Zn reactions.…”

Section: Resultsmentioning

confidence: 96%

“…Accordingly, many cross-sectional TEM works have been conducted recently [14][15][16], but no results on the ORs and the interfaces of the Fe-Zn intermetallic phases have been reported. In addition, Cho et al [17] reported that no ORs were found between the α-Fe and Γ 1 , Γ 1 and Γ 2 , as well as Γ 2 and δ phases during the galvannealing of a Mn-Si TRIP steel.…”

Section: Introductionmentioning

confidence: 99%

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Orientation relationships and interfaces of the Fe–Zn intermetallic phases in galvannealed CMnSi-TRIP steels

Wang

You

Chang

et al. 2015

Materials Characterization

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Orientation relationships and interfaces of the Fe–Zn intermetallic phases in galvannealed CMnSi-TRIP steels

Wang

You

Chang

et al. 2015

Materials Characterization

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“…Figure 3a shows the cross-sectional microstructure of the GA coating layer, illustrating an average coating thickness of 8.4 µm. Before Zn solidification in the GA process, Zn and Fe interdiffuse during thermal annealing and break down the Al-Zn-Fe inhibition layer, resulting in the formation of intermetallic compounds (IMCs) such as gamma (Γ 1 : Fe 5 Zn 21, Γ: Fe 3 Zn 10 ), delta (δ: FeZn 7 ), and zeta (ζ: FeZn 13 ) phases [31,32]. As shown in Figure 3a, the GA coating layer in this study consisted of two distinct phases: a thin interfacial layer and a thick overlayer.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Long-Term Reliability of Seal DeltaSpot Welded Dissimilar Joint between 6061 Aluminum Alloy and Galvannealed Steel via Excimer Laser Irradiation

et al. 2021

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Structural-adhesive-assisted DeltaSpot welding was used to improve the weldability and mechanical properties of dissimilar joints between 6061 aluminum alloy and galvannealed HSLA steel. Evaluation of the spot-weld-bonded surfaces from lap shear tests after long-term exposure to chloride and a humid atmosphere (5% NaCl, 35 °C) indicated that the long-term mechanical reliability of the dissimilar weld in a corrosive environment depends strongly on the adhesive–Al6061 alloy bond strength. Corrosive electrolyte infiltrated the epoxy-based adhesive/Al alloy interface, disrupting the chemical interactions and decreasing the adhesion via anodic undercutting of the Al alloy. Due to localized electrochemical galvanic reactions, the surrounding nugget matrix suffered accelerated anodic dissolution, resulting in an Al6061-T6 alloy plate with degraded adhesive strength and mechanical properties. KrF excimer laser irradiation of the Al alloy before adhesive bonding removed the weakly bonded native oxidic overlayers and altered the substrate topography. This afforded a low electrolyte permeability and prevented adhesive delamination, thereby enhancing the long-term stability of the chemical interactions between the adhesive and Al alloy substrate. The results demonstrate the application of excimer laser irradiation as a simple and environmentally friendly processing technology for robust adhesion and reliable bonding between 6061 aluminum alloy and galvannealed steel.

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“…as dual phase or interstitial free steels, in the production of vehicle components. In the galvannealing process, steel sheets are subjected to a zinc bath followed by a heat treatment that converts the entire coating to a zinc-iron alloy (Kao et al, 2009). Thus, the main difference of this process when compared with a typical galvanized coating is the formation of intermetallic compounds between the deposited zinc layer and the iron from the substrate (McDevitt et al, 1997;Morimoto et al, 1997;Kato et al, 2000).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of the Fe-Zn intermetallic phases using the Rietveld Method

Santos

Lopes

Wendhausen

2014

Rem: Rev. Esc. Minas

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The Rietveld Method was used to investigate the structure of three Fe-Zn intermetallic phases and to quantify their proportion. The zeta, delta and gamma phases were successfully obtained by the sintering process. A simple mixture of the three intermetallic phases was made with a known mass percentage and the XRD pattern of this mixture was collected and analyzed by the Rietveld Method. A difference of 14% between the simulated and the experimental XRD patterns was found, indicating a satisfactory fitting. Slightly different lattice parameters from those given in the ICSD cards were observed. Because of the good fitting, the calculated phase percentages of the mixture agreed closely with the real ones. Thus, it was concluded that the Rietveld Method is a reliable method to quantify the phases in galvannealed steel sheets and the same methodology applied in this laboratorial study can be applied to industrial sheets.

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Cross-sectional observation of the intermetallic phase in a galvannealed steel

Cited by 12 publications

References 7 publications

Orientation relationships and interfaces of the Fe–Zn intermetallic phases in galvannealed CMnSi-TRIP steels

Orientation relationships and interfaces of the Fe–Zn intermetallic phases in galvannealed CMnSi-TRIP steels

Enhanced Long-Term Reliability of Seal DeltaSpot Welded Dissimilar Joint between 6061 Aluminum Alloy and Galvannealed Steel via Excimer Laser Irradiation

Synthesis and characterization of the Fe-Zn intermetallic phases using the Rietveld Method

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