Part III. Kinetics of the (Zn) - Coating Deposition During Stable and Meta-Stable Solidifications

Wołczyński, W.; Kucharska, Barbara; Garzeł, G.; Sypień, Anna; Pogoda, Zdzisław; Okane, Toshimitsu

doi:10.1515/amm-2015-0032

Cited by 10 publications

(15 citation statements)

References 15 publications

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“…In other words, Al and Ni diffused from the T phase to the inside of the steel, and Fe, Mn, and C, which are the elements of steel, diffused toward the Al9FeNi (T) phase to form a reaction phase. This phenomenon is similar to the Wołczyński's model, in which a reaction phase is generated by soliddiffusion during hot-dipping [25]. Therefore, the phase formed by the reaction through solid diffusion of Al was the Fe2Al5 (η) phase, which is marked as R2 in Figures 5-10, and it was not the FeAl3 (θ) phase formed by the reaction with the liquid phase.…”

Section: Discussionsupporting

confidence: 70%

Microstructural Evolution of Intermetallic Compound Formed in Boron Steel Hot-Dipped in Al–7%Ni Alloy

Yun

Lee

Kwak

et al. 2017

Metals

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Abstract:The microstructural evolution of the intermetallic compound (IMC) layer formed on and in boron steel that was hot dipped in an Al-7Ni (wt %) bath at 690 • C for 30-180 s was investigated, and the growth mechanism of the IMC was identified. Except for the solidification structure of Al, the reaction layer consisted of one layer on the steel surface and two layers in the steel interior. The reaction phase formed on the original surface of the steel was the Al 9 FeNi (T) phase, which has a monoclinic (space group: P21/c) crystal structure. The reaction phase formed from the T phase was the Fe 2 Al 5 (η) phase, which is orthorhombic (space group: Cmcm). The variation in thickness of the η phase increased linearly with increasing dipping time, which is in accordance with the diffusion growth, a growth mechanism of the η phase in Al-coated pure Fe and low-carbon steels. The Fe 3 AlC (κ) phase (which had a band shape with a width of 100 nm) and a cubic system were formed along the interface between the Fe2Al5 (η) phase and the steel.

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Section: Discussionsupporting

confidence: 70%

Microstructural Evolution of Intermetallic Compound Formed in Boron Steel Hot-Dipped in Al–7%Ni Alloy

Yun

Lee

Kwak

et al. 2017

Metals

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“…3. The current growth laws are in good agreement with the analogous laws presented recently for the same technology, [18].…”

Section: Resultssupporting

confidence: 89%

Growth Law For Peritectic Phases Formation In The Zinc Coating

Guzik

Kopyciński

Wołczyński

2015

Archives of Metallurgy and Materials

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Some experiments dealing with the isothermal hot dip galvanizing were carried out. The (Zn) -coating settled on the Armco-iron substrate were examined after arresting the solidification for different periods of time. The measurement of the thickness of each sub-layer in the coating were performed due to the SEM -analysis. The zinc segregation on the cross-section of the studied sub-layers were also determined by the EDS technique. The growth laws are formulated mathematically for each of the observed sub-layer. The mechanism of the sub-layer formation is also analysed due to the observation of the birth/nucleation of the phases in the sub-layers and the effect of flux onto the sub-layers morphology formation. The appearance of each phase is referred to the Fe-Zn diagram for stable equilibrium according to which these phases are the products of the adequate peritectic transformation.Keywords: (Zn) -coating; zinc segregation; growth law; crystallization of peritectic phases Przeprowadzono eksperymenty izotermicznego cynkowania zanurzeniowego. Powłoka (Zn) osadzona na żelazie Armco poddana została badaniom po zatrzymaniu krystalizacji dla różnych czasów trwania cynkowania. Dokonano pomiarów grubości każdej z podwarstw powłoki dzięki analizie SEM. Segregacja cynku na przekroju badanych podwarstw również została określona dzięki pomiarom przy użyciu techniki EDS. Sformułowane są matematycznie prawa wzrostu dla każdej z analizowanych podwarstw. Analizowany jest również mechanizm kształtowania podwarstw dzięki obserwacjom narodzin/zarodkowania poszczególnych faz w podwarstwach oraz dzięki analizie oddziaływania topnika na morfologię podwarstw. Formowanie każdej z faz jest odniesione do diagramu równowagowego Fe-Zn zgodnie z którym fazy te są produktami odpowiednich reakcji perytektycznych.

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“…(5). This formula corresponds well with the rate of the appropriate phases (Γ 1 , δ C , δ P and ζ ), thickening, λ(t), which can be calculated on the basis of the laws, λ(t), for example, well determined in the industry condition, [23]. Both formulas, however, are generally associated with the data taken from the Fe-Zn phase diagram and additionally with the Lever Rule applied to the peritectic points of this phase diagram.…”

Section: Flux Effect Onto the (Zn) -Coating Formationsupporting

confidence: 58%

Flux Effect Onto Peritectic Phases Growth In The Zinc Coating

Kopyciński¹,

Guzik²

2015

Archives of Metallurgy and Materials

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FLUX EFFECT ONTO PERITECTIC PHASES GROWTH IN THE ZINC COATING WPŁYW TOPNIKA NA WZROST FAZ PERYTEKTYCZNYCH W POWŁOCE CYNKOWEJA model of the (Zn) -coating formation on the iron/steel substrate is proposed. The model assumes the phases' sub-layers creation in a sequence. This sequence is referred to the Fe-Zn phase diagram. However, this sequence of phases' appearance is perturbed by the flux presence in the zinc bath. The flux effect on the coating morphology and appearance/disappearing of some sub-layers is analysed. The phases' formation is treated as the result of the peritectic reaction accompanying the coating solidification. A comparison of the coating formations before and after flux decay is delivered. Thus, a function which describes the flux decay is also analysed. Additionally, a ternary Fe-Zn-F(flux) phase diagram is considered. The varying zinc concentration across the phases sub-layers is described with the use of the function which determines the flux decay. The behaviour of the solidification path before and after flux decay is discussed due to the adequate equations formulated in frame of the current model.Keywords: Fe-Zn-flux phase diagram; flux disappearing; coating thickening Zaproponowany został model kształtowania się powłoki (Zn) na podłożu ze stali/żelaza. Model zakłada powstawanie podwarstw faz w pewnej sekwencji. Sekwencja ta odniesiona jest do diagramu równowagowego. Jednak, sekwencja ta zakłócona jest obecnością topnika w kąpieli. Wpływ topnika na morfologię powłoki oraz na pojawianie się/zanik niektórych podwarstw jest analizowany. Powstawanie faz traktowane jest jako rezultat reakcji perytektycznych towarzyszących krystalizacji powłoki. Pokazane jest porównanie kształtowania się powłoki przed i po zaniku topnika. Stąd, analizowana jest również funkcja, która opisuje zanik topnika. Dodatkowo, rozważany jest potrójny diagram fazowy Fe-Zn-topnik. Zmienne stężenie cynku na grubości podwarstw opisane jest z użyciem funkcji, która opisuje zanik topnika. Zachowanie się ścieżki krystalizacji przed i po zaniku topnika jest dyskutowane w odniesieniu do stosownych równań sformułowanych w proponowanym modelu.

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Part III. Kinetics of the (Zn) - Coating Deposition During Stable and Meta-Stable Solidifications

Cited by 10 publications

References 15 publications

Microstructural Evolution of Intermetallic Compound Formed in Boron Steel Hot-Dipped in Al–7%Ni Alloy

Microstructural Evolution of Intermetallic Compound Formed in Boron Steel Hot-Dipped in Al–7%Ni Alloy

Growth Law For Peritectic Phases Formation In The Zinc Coating

Flux Effect Onto Peritectic Phases Growth In The Zinc Coating

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