Influence of Delta Phase Morphology in Galvannealed Coated Steels on Formability

Sriram, S.; Krishnardula, Venu G.; Hahn, H.

doi:10.1088/1757-899x/418/1/012094

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…The surface roughness as a surface property of the galvannealed coatings influences the forming process of galvannealed steels since it alters the deformation behaviour by changing friction between the coating and die [13]. Sriram et al [13] reported that cubic delta (δ 1k ) coatings with lower roughness had better formability than rod delta coatings (δ 1p ). Additionally, a good correlation was found between the index of image clarity after painting and galvannealed surfaces [14].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Elkoca,

Ekmekci,

Elkoca

2021

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A study on the surfAce roughness of gAlvAnneAled low cArbon Al-Killed And ti-nb stAbilized interstitiAl free steels in this study, the surface roughness of galvannealed low carbon Al-killed and Ti-Nb stabilized interstitial free steels was investigated using the industrial galvannealing process parameters. The iron content of the coatings was also analysed to establish a relationship with the surface roughness and coating composition.The surface roughness displayed an exponential behaviour with increasing of annealing time at each annealing temperature in both steel coatings, which was in an increasing order in the galvannealed low carbon Al-killed steel coating, whereas it was a reverse order in the galvannealed Ti-Nb stabilized interstitial free steel coating. The craters were observed on the galvannealed coatings resulting in high surface roughness. increasing the iron content of the coatings leads to a reduction in the surface roughness with δ 1k phase.

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Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Elkoca,

Ekmekci,

Elkoca

2021

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Influence of Friction on the Formability of Fe-Zn-Coated IF Steels for Car Body Parts

Evin

Tomáš

2022

Lubricants

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This paper presents the formability results of galvanized Zn–Fe-based interstitial-free (IF) “galvanneal” steel sheets with different degrees of alloying. The Fe content of the Zn–Fe coatings was determined by titration method and the phase composition of the coatings was determined by raster electron microscopy with EDX analyzer. A deterioration of the adhesion of the Fe–Zn coating to the substrate was observed in the pre-alloyed coating. The applied modes of annealing and smooth rolling after the surface galvanization resulted in a change in the surface microgeometry parameters Ra and Pc. The suitability of the surface microgeometry of the used Zn–Fe-coated sheets was assessed using control diagrams and the capability indexes Cpk with respect to the defined specifications. The coefficient of friction was determined by dry friction cup test, and using Anticorit lubricant and microtene film as lubricants. With increasing Fe content in the coating, a slight increase in friction coefficient values was observed—a slight deterioration in formability. The results obtained indicate that for car body surface parts, the Fe content of the Zn–Fe coating should range from 7% to 12%.

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Influence of Delta Phase Morphology in Galvannealed Coated Steels on Formability

Cited by 2 publications

References 2 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Influence of Friction on the Formability of Fe-Zn-Coated IF Steels for Car Body Parts

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