Properties of a Newly Developed Galvannealed Steel Sheet with Modified Surface

Sakurai, Michitaka; Hiraya, Akira; Inoue, Shigeru; Yamasaki, Yuji; Matsuda, Yasunori; Hashimoto, Satoshi; Urakawa, Takayuki; Inagaki, Jun-ichi

doi:10.4271/2011-01-1056

Cited by 4 publications

(10 citation statements)

References 2 publications

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“…On the contrary, all the lubrication-treated GA samples show lower friction coef cients than the non-treated ones, independent of the ζ/δ 1 phase intensity ratio. The tendency of the friction coefcients obtained in this group is in good agreement with that of prior works which investigated the friction coef cients of GA and lubrication-treated GA by using SKD as the tool material 2,3,[16][17][18] . In a comparison between the SKD and CR tools, they show similar tendencies.…”

Section: Friction Coef Cientsupporting

confidence: 78%

“…The friction coef cient of GA is independent of the ζ/δ 1 phase intensity ratio, and the non-lubrication-treated GA and lubrication-treated GA show similar values. The tendency of the friction coef cients obtained in this group is different from that of prior works which investigated the friction coef cients of GA and lubrication-treated GA by using SKD as the tool material 2,3,[16][17][18] . Group 3 is the case when FCD was used as the tool material, as shown in Fig.…”

Section: Friction Coef Cientcontrasting

confidence: 48%

“…As a base materials of the lubrication-treatment, the above-mentioned GA1, GA2 and GA3 were used respectively. A surface modi cation technology which modi es several 10 nm of the thickness of GA surface was applied as the lubrication-treatment in this study [16][17][18] . This technology utilizes a well-known lubrication mechanism which inhibits the adhesion between metals by means of a chemical compound such as an oxide layer 16) .…”

Section: Test Specimensmentioning

confidence: 99%

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Effect of Tool Materials on Frictional Properties of Galvannealed Steel Sheets

Hoshino¹,

Yamasaki²,

Tanimoto

et al. 2017

Mater. Trans.

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The frictional behavior of galvannealed steel sheets (GA) depending on tool materials was investigated. GA having different ζ/δ 1 phase intensity ratios was prepared as specimens. In addition, lubrication-treated GA was also prepared using these specimens as the base material. Four kinds of tools composed of zinc alloy die casting (ZAS), ductile cast iron (FCD), alloy tool steel (SKD) and Cr-coated FCD (CR) were used as sliding tools in order to simulate actual press tools used in trials and mass production. When the tool material was harder than the test specimens, the friction coef cient of the GA increased as the amount of the ζ phase increased, and the effect of the lubrication treatment was clearly observed. However when the tool material was softer than the test specimens, the friction coef cient was constant and independent of the existence of the ζ phase and lubrication treatment. The change in the frictional behavior was discussed from the viewpoint of the change in the friction mechanism depending on the relative hardness of the surfaces of the specimens to the tool materials.

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Section: Friction Coef Cientsupporting

confidence: 78%

Section: Friction Coef Cientcontrasting

confidence: 48%

Section: Test Specimensmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Tool Materials on Frictional Properties of Galvannealed Steel Sheets

Hoshino¹,

Yamasaki²,

Tanimoto

et al. 2017

Mater. Trans.

Self Cite

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“…9,10) The effect of fluid lubrication on the friction coefficient is thought to be relatively small under this condition.…”

Section: )mentioning

confidence: 96%

“…Condition A has a shorter contact length (tool length), higher contact pressure and higher sliding speed, and has a good correlation with the drawing beads of the tool. 9,10) The effect of fluid lubrication on the friction coefficient is considered to be relatively large under this condition.…”

Section: Flat Sliding Testmentioning

confidence: 99%

Effect of Al-based Oxide Layer on Frictional Properties of Hot-dip Galvanized Steel Sheets

Hoshino¹,

Nagoshi²,

Tanimoto

et al. 2017

ISIJ Int.

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The effect of the Al-based oxide layer which segregates on the surface of hot-dip galvanized steel sheets (GI) with aging on the frictional properties of the GI was investigated.Conventional GI with the Zn coating weight of 67 g/m 2 including 0.36 mass% Al were used as test specimens. It was found that an Al-based oxide layer grew on the GI surface with aging after production, and the friction coefficient tended to decrease due to the existence of these Al-based oxides. However, this tendency was clearer under the sliding conditions of shorter tool length and higher contact pressure than of longer tool length and lower contact pressure.In order to understand this behavior, surface observation and analysis of both the test specimens and the tools after sliding were carried out by SEM, EDX and EPMA. Both Al-based oxides and metallic Zn were detected as adhered materials on the tool surface after sliding, and the surfaces of adhered materials were covered with Al-based oxides. This suggests that the adhered materials on the tool have the effects of reducing the adhesion force between the metallic Zn of the GI and the tool and reducing the tool roughness. These effects led to a lower friction coefficient because both shearing and plowing resistance were decreased. In addition, the area on the tool which were covered by the adhered materials depended on the tool length. This is thought to be the reason why the effect of the Al-based oxide layer depended on the sliding conditions.

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Diffusion Behavior of Al in Zn Coating Layer of Zn-0.2mass%Al Hot-dip Galvanized Steel Sheets with and without Temper Rolling during Aging after Production

Hoshino

Oikawa

Okumura³

et al. 2021

ISIJ Int.

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It is known that Al added to the Zn coating layer of hot-dip galvanized steel sheets (HDG) diffuses to the surface at room temperature and forms Al-based oxides in air. In order to understand the diffusion behavior of Al in Zn coating layer, this study investigated the effect of the aging temperature on the segregation behavior of Al-based oxides in HDG with and without temper rolling (skinpass rolling) using a material with a Zn coating weight of about 56 g/m 2 with an Al content of approximately 0.20 mass%. The specimens were aged at − 15, 5, 20, 38, 100 or 200°C in air after production, and the surface and cross sections were observed and analyzed by XRF, SEM-EDX, EBSD and TEM. As a result, up to the aging temperature of 38°C, the amount of Al-based oxides increased linearly to the square root of aging time, suggesting that the formation rate is determined by the diffusion of Al in Zn coating layer in this temperature range. However, this linear relationship did not hold at aging temperatures above 100°C. In addition, in the temper-rolled HDG, the formation rate of Al-based oxides is larger than that without temper rolling up to the aging temperature of 38°C, and then decreased drastically at aging temperatures above 100°C. The segregation behavior of Al-based oxides is discussed in view of the diffusion behavior of Al and the changes in the macrostructure of the Zn coating layer during the aging after production.

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Properties of a Newly Developed Galvannealed Steel Sheet with Modified Surface

Cited by 4 publications

References 2 publications

Effect of Tool Materials on Frictional Properties of Galvannealed Steel Sheets

Effect of Tool Materials on Frictional Properties of Galvannealed Steel Sheets

Effect of Al-based Oxide Layer on Frictional Properties of Hot-dip Galvanized Steel Sheets

Diffusion Behavior of Al in Zn Coating Layer of Zn-0.2mass%Al Hot-dip Galvanized Steel Sheets with and without Temper Rolling during Aging after Production

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