Characterization of the failure behavior of zinc coating on dual phase steel under tensile deformation

Song, Gui-Ming; Sloof, Willem G.

doi:10.1016/j.msea.2011.04.058

Cited by 16 publications

(6 citation statements)

References 20 publications

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“…Porem na medida em que a trinca percorre a seção transversal do revestimento até o aço base é possível constatar que em função da existência das interfaces δ/Γ e Γ/aço-base ocorre diferença de comportamento. [10][11][14][15]. Desta forma observa-se que as tensões compressivas e tratativas dos caminhos de deformação estudados afetam de forma diferente a superfície e a seção do revestimento com relação ao aumento de trincas e a sua conectividade com o aço base.…”

Section: Conectividade Das Trincas Do Revestimento Com O Aço Base E Punclassified

“…Porem, para os caminhos de Deformação Plana e Estiramento Biaxial Simétrico ainda existe pouca literatura. [10][11]. O presente trabalho, portanto avaliou o efeito dos caminhos de Deformação Uniaxial, Deformação Plana e Estiramento Biaxial Simétrico na evolução das trincas de revestimento com Zinco-Ferro (Galvannealed-GA) e sua conectividade com o aço base em um aço bifásico DP600.…”

Section: Introductionunclassified

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EFEITO DOS CAMINHOS DE DEFORMAÇÃO NA FORMAÇÃO DE TRINCAS NO REVESTIMENTO Zn-Fe APLICADOS EM AÇOS BIFÁSICOS

Silveira¹,

Oliveira²,

Filho³

et al. 2018

ABM Proceedings

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ResumoPara produzir os aços bifásicos galvanizados com revestimento de Zn-Fe as tecnologias de galvanização foram adaptadas visando à produção de aços com alta resistência, resistentes à corrosão e boa conformabilidade. Desta forma, e considerando as deformações obtidas na estampagem tornou importante a caracterização em laboratório da influência do nível e do caminho de deformação na geração de trincas do revestimento com Zn-Fe aplicado a um aço bifásico. O presente trabalho avaliou o efeito dos caminhos de Deformação Uniaxial, Deformação Plana e Estiramento Biaxial Simétrico na evolução das trincas do revestimento Zinco-Ferro (Galvannealed-GA) e sua conectividade considerando o aço base Dual Phase 600. Foi observado que aumento da área composta por trincas ocorre com o aumento do nível de deformação para todos os caminhos avaliados. O Estiramento Biaxial Simétrico foi o caminho de deformação que mais influenciou no aumento da área com trincas na superfície do revestimento e na conexão destas trincas com o aço base. Isso ocorreu em função do estado de tensão (tração-tração) imposta à superfície e à seção dos revestimentos. Mesmo sendo observada a conectividade das trincas com o aço base não foi verificado visualmente defeitos de desplacamento do revestimento tais como Powdering e Flaking. Palavras-chave: Aços bifásicos; Galvanized (GI); Galvannealed (GA); Caminhos de deformação. EFFECT OF DEFORMATION PATHS IN THE FORMATION OF CRACK IN ZN-Fe COATED APPLIED AT DUAL PHASE STEEL AbstractTo produce the dual phase steels with Zn-Fe coating the hot dip process technologies were adapted aiming the production of steels with high strength, corrosion resistant and good formability. Thus, considering the deformations obtained from on the stamping process grew important the characterization of influence of the level and the deformation path on the generation of cracks at Zn-Fe coating. The present work evaluated the effect of the deformation paths "Uniaxial Deformation Plane Strain and Symmetrical Biaxial Stretching" in the evolution of cracks at Zn-Fe coating and the connectivity this cracks with substrate. Was observed that area whit cracks of coating increasing with the strain level for all deformation paths. The Symmetrical Biaxial Stretching was deformation paths that most influenced the increase of the area with cracks in the surface of the coating and the connection of these cracks with the substrate. This occurred due to state of stress imposed at surface and the cross section of the coating. Even being observed the connectivity of the cracks of coating with the substrate, was not visually observed the adherence defects such as Powdering and Flaking.

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Section: Conectividade Das Trincas Do Revestimento Com O Aço Base E Punclassified

Section: Introductionunclassified

EFEITO DOS CAMINHOS DE DEFORMAÇÃO NA FORMAÇÃO DE TRINCAS NO REVESTIMENTO Zn-Fe APLICADOS EM AÇOS BIFÁSICOS

Silveira¹,

Oliveira²,

Filho³

et al. 2018

ABM Proceedings

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“…Therefore, some scholars have considered the cause of the failure of the galvanized layer and its influence on the stamping performance of the steel sheet. The effect of the oxide and alloying elements on the bonding strength of the interface between coating and substrate was investigated by Song [3,4,5]. Ploypech [6,7] studied the effect of phase thickness on the crack resistance of the zinc coating, and simulated the crack growth mechanism by finite element simulation.…”

Section: Introductionmentioning

confidence: 99%

Influence of zinc coating on anisotropic mechanical properties of hot dip galvanized steel sheet DP600

Gui

Long

Cui

et al. 2018

J. Phys.: Conf. Ser.

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“…For galvanized steel sheets, features of zinc layer during the deformation also need to be considered carefully. There have been many studies on the formability of galvanized steel sheets . The zinc layer is composed of intermetallics including the outer η phase, the subsequent ζ phase, the δ phase, and the inner γ phase .…”

Section: Introductionmentioning

confidence: 99%

“…Severe macro‐cracks might be developed when microcracks from different directions unite . Song studied the failure of zinc layer on dual‐phase steel sheet during tensile deformation, and he found the pre‐existed microcracks and voids at the zinc grain boundaries propagate along the zinc grain boundaries and form crack nets within the zinc layer under tension . The study of Ploypech et al demonstrates that the crack resistance of the Zinc coating could be improved with the decrease of the δ layer with respect to the ζ layer.…”

Section: Introductionmentioning

confidence: 99%

Formability of 800 MPa Grade Hot‐Dip Galvanized Steel Sheet

Song

Zhang

Gao³

2018

steel research int.

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Hot-dip galvanized steel sheets are widely used for their better corrosion resistance. With the development of steel materials and the need for higher performance of galvanized steel, it is urgent to carry out research on the formability of 800 MPa or even higher grade hot-dip galvanized steel sheets. In this paper, forming limit diagram (FLD) is assessed in laboratory by stretch-forming galvanized sheets with a hemispherical punch. The intersection of forming limit curve (FLC) and the major strain axis is around 0.28. By comparison to zinc layer removed samples, galvanized samples have higher yield strength and lower strain hardening coefficient. Formability of experimental galvanized sheets declines significantly attributed to the existence of brittle intermetallic Fe-Zn phase. The original positions of cracking in zinc layer are microcracks and voids around the zinc grain boundaries. During punch forming, the crack networks are formed by the microcracks from the different layers of the zinc coating and may accumulate and propagate to the surface. Forming failure including cracks and flaking makes the zinc layer thinner and increases the tendency of matrix to be exposed.

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Characterization of the failure behavior of zinc coating on dual phase steel under tensile deformation

Cited by 16 publications

References 20 publications

EFEITO DOS CAMINHOS DE DEFORMAÇÃO NA FORMAÇÃO DE TRINCAS NO REVESTIMENTO Zn-Fe APLICADOS EM AÇOS BIFÁSICOS

EFEITO DOS CAMINHOS DE DEFORMAÇÃO NA FORMAÇÃO DE TRINCAS NO REVESTIMENTO Zn-Fe APLICADOS EM AÇOS BIFÁSICOS

Influence of zinc coating on anisotropic mechanical properties of hot dip galvanized steel sheet DP600

Formability of 800 MPa Grade Hot‐Dip Galvanized Steel Sheet

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