Surface roughness of a hot-dipped galvanized sheet steel as a function of deformation mode

Wichern, C. M.; Cooman, Bruno C. De; Tyne, C. J. Van

doi:10.1016/j.jmatprotec.2004.06.017

Cited by 17 publications

(18 citation statements)

References 8 publications

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“…As a result of the absence of contact a true in-plane deformation occurs and inhomogeneous material deformation is not artificially enforced. Accordingly, this test is perfectly suitable for characterizing microstructural mechanisms and, therefore, regained a lot of interest recently [18][19][20][21]. Furthermore, the Marciniak tests can be carried out safely in SEM since there is no influence on the working principles of electron microscopy.…”

Section: Critical Comparison Of Potential Testing Methodologies For Mmentioning

confidence: 99%

Multi-Axial Deformation Setup for Microscopic Testing of Sheet Metal to Fracture

et al. 2011

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While the industrial interest in sheet metal with improved specific-properties led to the design of new alloys with complex microstructures, predicting their safe forming limits and understanding their microstructural deformation mechanisms remain as significant challenges largely due to the inadequacy of the existing experimental tools. The investigation of the strain-path dependent failure mechanisms requires miniaturized testing equipment, which can be placed in a scanning electron microscope for in situ experiments. So far, such tests could only be carried out for a single strain path (uniaxial tension). In this work, in order to fill this gap, a miniaturized Marciniak test setup is designed, built and tested. With this setup real-time, multi-axial tests of industrial sheet metal can be carried out to the point of fracture within a

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Section: Critical Comparison Of Potential Testing Methodologies For Mmentioning

confidence: 99%

Multi-Axial Deformation Setup for Microscopic Testing of Sheet Metal to Fracture

et al. 2011

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“…Those methods succeed to decrease the surface roughness of stent, but as is well known, its plastic deformation still changes the surface condition after stent fully expands. Many investigators confirmed that changes in the grain structure of metals lead to changes in its surface roughness [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 98%

Effects of plaque lengths on stent surface roughness

Syaifudin

Takeda

Sasaki

2015

Bio-Medical Materials and Engineering

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The physical properties of the stent surface influence the effectiveness of vascular disease treatment after stent deployment. During the expanding process, the stent acquires high-level deformation that could alter either its microstructure or the magnitude of surface roughness. This paper constructed a finite element simulation to observe the changes in surface roughness during the stenting process. Structural transient dynamic analysis was performed using ANSYS, to identify the deformation after the stent is placed in a blood vessel. Two types of bare metal stents are studied: a Palmaz type and a Sinusoidal type. The relationship between plaque length and the changes in surface roughness was investigated by utilizing three different length of plaque; plaque length longer than the stent, shorter than the stent and the same length as the stent. In order to reduce computational time, 3D cyclical and translational symmetry was implemented into the FE model. The material models used was defined as a multilinear isotropic for stent and hyperelastic for the balloon, plaque and vessel wall. The correlation between the plastic deformation and the changes in surface roughness was obtained by intermittent pure tensile test using specimen whose chemical composition was similar to that of actual stent material. As the plastic strain is achieved from FE simulation, the surface roughness can be assessed thoroughly. The study found that the plaque size relative to stent length significantly influenced the critical changes in surface roughness. It was found that the length of stent which is equal to the plaque length was preferable due to the fact that it generated only moderate change in surface roughness. This effect was less influential to the Sinusoidal stent.

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“…This mismatch is not related to intrinsic material properties and can be solved easily by optimization of the forming process. In contrast, microstructural defects inside the metal sheet such as dislocation bands, misoriented grain colonies, and hard precipitate particles can result in surface roughening during plastic deformation [10][11][12][13][14][15].…”

mentioning

confidence: 99%

Analysis of the surface-roughening phenomenon in P-added bake-hardened steel sheets

Goo

Kang

2014

Integr Mater Manuf Innov

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The surface-roughening problem with phosphorous-added bake-hardened steel sheets was investigated. Surface undulation in the sheets occurs after 2% to 3% deformation during press forming action and disappears with further deformation over 10%. The roughened sheets exhibit heterogeneity of the elemental P (phosphorous) distribution, and the segregation of P increases the hardiness of ferrite grains locally. This local strengthening of ferrite grains causes a concentration of strains in the other ferrite regions that do not contain the elemental P-segregation. The strain concentration is because of the surface undulation in the sheets under small amount of straining. The evolution of the deformation texture and the corresponding Lankford values are shown using a series of viscoplastic self-consistent (VSPC) simulations, which indicated that a strong {554}[225] texture develops, and subsequently, the Lankford value increases in the non-segregated ferrite region. The higher Lankford value makes it more difficult to deform the sheet in the through-thickness direction. The different texture developments of the segregated and segregation-free regions are the main causes of the disappearance of the surface undulation with a high amount of plastic straining greater than 10%. Finally, we conclude that the segregation of P inherited from hot band affects the plastic deformation and developed textures of the thin steel sheets.

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Surface roughness of a hot-dipped galvanized sheet steel as a function of deformation mode

Cited by 17 publications

References 8 publications

Multi-Axial Deformation Setup for Microscopic Testing of Sheet Metal to Fracture

Multi-Axial Deformation Setup for Microscopic Testing of Sheet Metal to Fracture

Effects of plaque lengths on stent surface roughness

Analysis of the surface-roughening phenomenon in P-added bake-hardened steel sheets

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