Fe Solubility in the Zn-Rich Corner of the Zn-Al-Fe System for Use in Continuous Galvanizing and Galvannealing

McDermid, Joseph R.; Kaye, M.H.; Thompson, W. T.

doi:10.1007/s11663-007-9028-3

Cited by 60 publications

(25 citation statements)

References 29 publications

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“…The simulated galvanizing bath comprised a 50 kg melt containing 0.20 wt% dissolved Al and was Fe saturated. 22) In all cases, the sample thermal cycle was controlled via a 0.5 mm type K thermocouple welded directly to the samples. All selective oxidation tests were carried out in triplicate to ensure repeatability of the experimental results, whereas the reactive wetting experiments were run in duplicate due to limited availability of the experimental substrates.…”

Section: Methodsmentioning

confidence: 99%

Effect of Annealing Temperature on the Selective Oxidation and Reactive Wetting of a 0.1C-6Mn-2Si Advanced High Strength Steel During Continuous Galvanizing Heat Treatments

Pourmajidian

McDermid

2018

ISIJ International

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Section: Methodsmentioning

confidence: 99%

Effect of Annealing Temperature on the Selective Oxidation and Reactive Wetting of a 0.1C-6Mn-2Si Advanced High Strength Steel During Continuous Galvanizing Heat Treatments

Pourmajidian

McDermid

2018

ISIJ International

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“…The Zn bath was held at 733 K (460°C) and contained 0.2 wt pct dissolved Al and was Fe saturated. [28] Three different annealing atmospheres were tested, as shown in Table II, to determine the effect of oxygen partial pressure on selective oxidation and galvanizing behavior. These annealing atmospheres will be distinguished by their dew point in the subsequent text.…”

Section: Experimental Methodsmentioning

confidence: 99%

Selective Oxidation and Reactive Wetting of 1.0 Pct Si-0.5 Pct Al and 1.5 Pct Si TRIP-Assisted Steels

Bellhouse

McDermid

2010

Metall Mater Trans A

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The effect of oxygen partial pressure on the selective oxidation and reactive wetting behavior of 1.0 pct Si-0.5 pct Al and 1.5 pct Si TRIP-assisted steels was studied. The annealing atmosphere affected the surface chemistry and the oxide morphology, which in turn affected reactive wetting. Similar wetting results were observed for the two TRIP steel compositions with good wetting being observed at the two lower oxygen partial pressure atmospheres (220 K (-53°C) or 223 K (-50°C) dew point (dp) and 243 K (-30°C) dp) with poor reactive wetting at the higher oxygen partial pressure atmosphere (278 K (+5°C) dp). The differences in wetting were attributed to the oxide morphology. The predominant oxide morphology at the two low oxygen partial pressure atmospheres was larger, widely spaced oxide nodules. At the 278 K (+5°C) dp, the predominant oxide morphology was smaller, more closely spaced oxide nodules. TEM analysis revealed that at the 243 K (-30°C) dp, Fe 2 Al 5 was able to form between oxide nodules promoting good reactive wetting. At the 278 K (+5°C) dp, the more closely spaced nodules may have impeded the formation of Fe 2 Al 5 , thereby producing numerous bare spot defects in the zinc coating.

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“…Dipping temperatures were varied from 450°C to 480°C at intervals of 10°C and immersion times varied from 0.1 to 5 seconds, as outlined in Table I. All Zn-Al-Fe baths used were saturated with respect to Al and Fe, as determined as a function of composition and experimental temperature using the phase diagram of McDermid et al [20] and the appropriate tie-lines, such that each experimental bath contained approximately either 0.13 or 0.20 wt pct dissolved Al. It should be noted that the former simulated the composition of an industrial galvannealing bath and the latter an industrial galvanizing bath.…”

Section: Methodsmentioning

confidence: 99%

“…[9], q is the density of Fe 2 Al 5 Zn X (4125 · 10 6 mgm -3 ), and the factor 0.45 is the mass fraction of Al in Fe 2 Al 5 Zn X . [1,3,[7][8][9]12,[17][18][19][20]22,25] Examination of Figures 15 and 16 will show that the values of K p , K, and D 0 in Eq. [9] were determined explicitly from the experimental data.…”

Section: Kinetic Model-020 Wt Pct Dissolved Al Bathmentioning

confidence: 99%

Morphology and Kinetics of Interfacial Layer Formation during Continuous Hot-Dip Galvanizing and Galvannealing

Chen

Fourmentin

Dermid

2008

Metall Mater Trans A

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A galvanizing simulator with rapid spot cooling was used to obtain a well-characterized reaction times as short as 2 seconds in order to study the short-time microstructural development and kinetics of the galvanizing and galvannealing interfacial reaction layer. It was determined that the incubation and nucleation events of the interfacial layer formation were completed by the 2-second reaction time in all cases. For a 0.20 wt pct dissolved Al bath, FeAl 3 nucleates and grows during the initial stages of interfacial layer formation followed by Fe 2 Al 5 Zn X formation by diffusion-controlled transformation and growth. The final microstructure of the interfacial layer consisted of Fe 2 Al 5 Zn X in a two-layer arrangement comprising a fine-grained, compact lower layer with a coarser, noncompact upper layer. The Al content of the interfacial layer increased with reaction time and reaction temperature. Both of the Fe-Al phases formed exhibited a strong preferential crystallographic orientation with respect to the substrate surface. The evolution of the interfacial layer formed in a 0.13 wt pct dissolved Al bath was the result of competing processes. Fe-Al phases formed and grew during the reaction times explored, per the preceding mechanism. However, Fe-Zn phases also nucleated and grew during the reaction times explored via the process of inhibition breakdown, with these phases dominating the interfacial layer microstructures at longer reaction times. In this case, the Al content of the interfacial layer increased for all reaction times explored, but decreased with increasing reaction temperature, due to the more rapid initiation of inhibition breakdown. A model to describe the interfacial layer growth kinetics as a function of reaction time, bath temperature, and inhibition layer microstructure for the case of the 0.20 wt pct dissolved Al bath was proposed. It indicated that the development of microstructure of the interfacial layer had significant influence on the effective diffusion coefficient and growth rate of this layer.

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Fe Solubility in the Zn-Rich Corner of the Zn-Al-Fe System for Use in Continuous Galvanizing and Galvannealing

Cited by 60 publications

References 29 publications

Effect of Annealing Temperature on the Selective Oxidation and Reactive Wetting of a 0.1C-6Mn-2Si Advanced High Strength Steel During Continuous Galvanizing Heat Treatments

Effect of Annealing Temperature on the Selective Oxidation and Reactive Wetting of a 0.1C-6Mn-2Si Advanced High Strength Steel During Continuous Galvanizing Heat Treatments

Selective Oxidation and Reactive Wetting of 1.0 Pct Si-0.5 Pct Al and 1.5 Pct Si TRIP-Assisted Steels

Morphology and Kinetics of Interfacial Layer Formation during Continuous Hot-Dip Galvanizing and Galvannealing

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