Anticorrosion mechanisms of aluminized steel for hot stamping

Allély, C.; Dosdat, L.; Clauzeau, O.; Ogle, K.; Volovitch, P.

doi:10.1016/j.surfcoat.2013.10.072

Cited by 77 publications

(84 citation statements)

References 19 publications

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“…Subsequently, the attempt to use lubricant oils was abandoned due to complex cleaning procedures and a high risk for hydrogen-induced embrittlement [15]. Currently, various types of coatings, including aluminized coating [16][17][18][19][20], galvanized and galvannealed coatings [21][22][23], Zn-Ni alloy coating [24,25], sol-gel hybrid coating [26] and Al-Zn alloy coating [27], were developed industrially. Among which, Type 1 aluminized coating, Al-Si with a near eutectic composition, has been widely applied on high-strength boron steel sheets [28].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet

Tan

et al. 2019

Metals

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Most structural components undertake cyclic loads in engineering and failures always cause catastrophic economic losses and casualties. In the present work, the phase evolution of Al-Si coating of high-strength boron steel during hot stamping was investigated. Two types of 1500 MPa grade boron steel sheets, one with Al-Si coating and the other without, were studied to reveal the effect on the high-cycle fatigue behavior. The as-received continuously hot-dip Al-Si coating was composed of α(Al), eutectic Al-Si and τ5. After hot stamping at 1193 K, three phases formed in this coating: β2, Fe(Al,Si)2 and α(Fe). The experimental results showed that the endurance limit of the coated steel sheet was 370 MPa under 107 fully reversed tension-compression loading cycles as opposed to 305 MPa in the uncoated sheet. Both the coated and the uncoated specimens showed surface-induced transgranular fatigue fractures. In the uncoated sheet, the fatigue cracks were generated from the decarburization surface, but the Al-Si coating effectively prevented the occurrence of near-surface decarburization during high-temperature hot stamping, and the only cracks in the coated steel sheet were initiated at wire-cutting surfaces.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet

Tan

et al. 2019

Metals

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“…9) This coating also provides some sacrificial corrosion protection, which is generally considered to be insufficient. 13) With increasing customer expectations with regard to cosmetic and perforation corrosion, providing coated PHSs with additional cathodic protection has become a major issue. Zn and Zn-alloyed coating are therefore being developed.…”

Section: Introductionmentioning

confidence: 99%

Liquid-Metal-Induced Embrittlement Related Microcrack Propagation on Zn-coated Press Hardening Steel

et al. 2015

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The coatings on press hardening steel are needed to suppress high temperature oxidation and decarburization. Additional corrosion protection is provided by Zn coatings which provide cathodic protection to press hardened parts. Due to the low melting temperature of Zn and Zn-Fe intermetallic compounds, the Zn-coated PHSs are susceptible to LMIE during the die-quenching process. In the present work, the mechanical properties of Zn coated PHS were evaluated in terms of tensile properties and bending properties. A deterioration of the room temperature bendability, due to microcrack formation and propagation, was observed. The presence of Γ-Fe3Zn10 observed in the microcracks at room temperature correspond to liquid Zn at the die-quenching temperature, making it possible to trace the progress of the liquid Zn phase during microcrack formation. The results suggest that Zn-grain boundary diffusion causes the phase transformation to ferrite of the austenite grain boundary region. This results in intergranular cracking due to the lower strength of ferrite. The LMIE microcrack formation is most severe in areas where the applied stress and the friction are highest during the forming process, making the occurrence of LMIE-mitigated microcrack propagation dependent on the local deformation conditions.

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“…The thickness of alloyed layer is normally less than 5 μm and this layer is composed of mainly Fe 2 Al 8 Si. 7) The corrosion potential of Si is higher than that of Al. 8) The preferential corrosion of Al near Si starts first.…”

Section: Corrosion Behavior Of Typementioning

confidence: 99%

Corrosion Behavior of Aluminized Steel Sheets in 50-Year Outdoor Exposure Test

Maki

2019

ISIJ Int.

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Anticorrosion mechanisms of aluminized steel for hot stamping

Cited by 77 publications

References 19 publications

Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet

Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet

Liquid-Metal-Induced Embrittlement Related Microcrack Propagation on Zn-coated Press Hardening Steel

Corrosion Behavior of Aluminized Steel Sheets in 50-Year Outdoor Exposure Test

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