Effect of Surface Texture of Galvannealed Steel Sheet on Image Clarity after Painting

Sakurai, Michitaka; Inagaki, Jun-ichi; Yamashita, Masaaki

doi:10.2355/tetsutohagane1955.89.1_18

Cited by 5 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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]. The surface roughness of a galvannealed steel can be measured manually and intermittently with a portable contact profiler on the line [15] or continuously using a non-contact profiler in-line [16].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Elkoca,

Ekmekci,

Elkoca

2021

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Elkoca,

Ekmekci,

Elkoca

2021

View full text Add to dashboard Cite

show abstract

“…In draw and stretch forming of such panels, tools with small radii are usually used; as a result, so-called "surface roughening 1) " often occurs near sharp streamlines due to a comparatively large and multi-axial plastic deformation. Because surface roughening affects not only the appearance quality 2,3) but also the onset of fracture in press forming, 4) it is desirable to reduce surface roughening as much as possible.…”

Section: Introductionmentioning

confidence: 99%

Influence of Strain Ratio on Surface Roughening in Biaxial Stretching of IF Steel Sheets

et al. 2018

View full text Add to dashboard Cite

Due to an increasing demand for automobile outer panels with sharper streamlines, surface roughening during press forming is recognized as an important problem to be solved. However, although sheets are subjected to various deformation modes during press forming, the influence of deformation mode on surface roughening is not yet understood. Moreover, surface roughening behavior in Interstitial Free (IF) steels, which are now commonly utilized for outer panels, has not been studied. In this study the effect of deformation mode on surface roughening behavior in IF steels was examined, focusing in detail on the effect of texture development. Differences in surface roughness development and changes of microstructure were examined under equi-biaxial and plane-strain tension, using a macroscopic Marciniak test and microscopic in-situ observations. In addition, the influence of the distribution of crystal orientations on surface roughness development was numerically examined using a crystal plasticity finite-element analysis. The results showed that surface roughening was larger for plane-strain tension than for equi-biaxial tension regardless of the IF steels tested, due to the larger difference in deformation resistance among crystal grains depending on crystal orientation. It is therefore suggested that surface quality after press forming could be improved by reducing the difference in deformation resistance among the grains.

show abstract

“…It was reported that besides the properties of paint and the process conditions, the surface morphology of substrate was closely related to the DOI of top coat surface during the automobile manufacture process. 2,3 However, there are few papers to probe it intensively, especially in the field of the fabrication of organic coated steel sheet, which is the substantial aspect to affect the surface quality of electrical appliances. In this paper, the surface texture of different types of steel substrate sheet was investigated from the aspect of surface geometry.…”

Section: Introductionmentioning

confidence: 99%

“…In the recent year, DOI evaluation is widely applied to automobile industry as one of the important parameters for the topcoat control, which is also a tendency in electrical appliance manufacturing industry. It was reported that besides the properties of paint and the process conditions, the surface morphology of substrate was closely related to the DOI of top coat surface during the automobile manufacture process 2 2,3 However, there are few papers to probe it intensively, especially in the field of the fabrication of organic coated steel sheet, which is the substantial aspect to affect the surface quality of electrical appliances.…”

Section: Introductionmentioning

confidence: 99%

Relationship between distinctness of image of organic coatings and texture of substrate sheets

Ren

Wen

et al. 2011

Surface Engineering

View full text Add to dashboard Cite

With the application of scanning electrical microscopy, surface profilometer and surface mapping microscopy, the two-and three-dimensional surface morphologies of the different substrate sheets, including cold rolling, hot dipped galvanised and electrogalvanised sheets, were characterised. The overlaid effect of paint on the surface texture of substrate sheets was analysed with the aid of low pass filtering. The specular gloss and distinctness of image (DOI) of organic coating were also measured, which are finally related to the texture of substrate sheets. The results showed that the DOI of organic coating on cold rolling, hot dipped galvanised and electrogalvanised sheets were ranked in descending order, which was identical to the tendency presented by the roughness and waviness of substrate sheets. A series of parameters was postulated under the consideration of DOI control for organic coating. In this study, the DOI score was .69% when R a ,0?86 mm, R z ,5?43 mm, R pm ,2?26 mm, S m ,78?81 mm and W ca ,0?411 mm.

show abstract

Effect of Surface Texture of Galvannealed Steel Sheet on Image Clarity after Painting

Cited by 5 publications

References 1 publication

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Influence of Strain Ratio on Surface Roughening in Biaxial Stretching of IF Steel Sheets

Relationship between distinctness of image of organic coatings and texture of substrate sheets

Contact Info

Product

Resources

About