The coupling influence of size effects and strain rates on the formability of austenitic stainless steel 304 foil

Gau, Jenn Terng; Chen, Po‐Han; Gu, Hao; Lee, Rong Shean

doi:10.1016/j.jmatprotec.2012.10.004

Cited by 19 publications

(8 citation statements)

References 6 publications

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“…A higher level of cold work could also explain the higher material strength and lower ductility observed for the 316L3 alloy compared to 316L1. It has been previously shown that the forming limits of austenitic stainless steel 304 foil can be increased by an annealing heat treatment, even though the thickness to grain size ratio significantly reduced from N = 7.5 to 2.4 [49]. This suggests that in some circumstances, prior material processing can balance out size effects on the material properties of metal foil.…”

Section: The Effect Of Grain Size and Alloy Composition On The Mechanmentioning

confidence: 99%

Understanding Size Effects and Forming Limits in the Micro-Stamping of Industrial Stainless Steel Foils

Weiß

Zhang

Pereira

et al. 2020

Metals

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This study investigates the effect of grain size and composition on the material properties and forming limits of commercially supplied stainless steel foil for bipolar plate manufacture via tensile, stretch forming and micro-stamping trials. It is shown that in commercially supplied stainless steel the grain size can vary significantly and that ‘size effects’ can be influenced by prior steel processing and composition effects. While the forming limits in micro-stamping appear to be directly linked to the plane strain forming limits of the individual stainless steel alloys, there was a clear effect of the tensile anisotropy. In contrast to previous studies, forming severity and the likelihood of material failure did not increase with a decreasing channel profile radius. This was related to inaccuracies of the forming tool profile shape.

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Section: The Effect Of Grain Size and Alloy Composition On The Mechanmentioning

confidence: 99%

Understanding Size Effects and Forming Limits in the Micro-Stamping of Industrial Stainless Steel Foils

Weiß

Zhang

Pereira

et al. 2020

Metals

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“…Figures 16(a) and (b) show the comparison of the predicted tensile stress evolution during loading-unloading-loading sequences with experimental values, when using Eq. [4]. This comparison was performed only to check out that chord modulus evolution associated to the elastic-plastic model described above gave indeed a good prediction of the stress evolution.…”

Section: Loading-unloading Testsmentioning

confidence: 99%

“…[3] For instance, the austenitic ultra-thin stainless steel sheets including AISI 304 are currently used for the manufacturing of mobile phone parts, energy devices like film heater, and micro medical devices. [4,5] Fabrication processes of small parts, i.e., having dimensions between 2 and 20 mm, [6] with thin sheet metal, offer attractive characteristics of low production cost and low energy consumption compared to those of larger parts. [7] The thickness of the material is what determines whether it is called ultra-thin sheet, thin sheet, or even plate.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties Involved in the Micro-forming of Ultra-thin Stainless Steel Sheets

Pham

Thuillier

Manach

2015

Metall Mater Trans A

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The objective of this paper is to characterize the mechanical behavior of an ultra-thin stainless steel, of 0.15-mm thickness, that is commonly used in the manufacturing of miniature connectors. The main focus is the relationship between some microstructural features, like grain size and surface roughness, and the macroscopic mechanical behavior investigated in uniaxial tension and simple shear. In tension, adaptations to the very small sheet thickness, in order to hold the specimen under the grips, are presented. Yield stress, initial elastic modulus, and evolution of the loading-unloading slope with plastic deformation were evaluated. Moreover, the kinematic contribution to the hardening was characterized by monotonic and cyclic simple shear test and reproduced by a mixed hardening law implemented in Abaqus finite element code. Then, the evolution of surface roughness with plastic strain, both in tension and simple shear, was analyzed. It was shown that in the case of an ultra-thin sheet, the stress levels, calculated either from an average thickness or when considering the effect of the surface roughness, exhibit a significant difference. Finally, the influence of surface roughness on the fracture of a tensile specimen was also investigated.

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“…Recently, there has been a change in approach, e.g., from the point of view of describing the material model in numerical simulations, when modern material models allow including the in uence of the deformation rate on the forming process. [9][10][11][12] Re nement of the description of the in uence of the deformation rate during the stamping by modifying the material card shall bring more precision to the results of the numerical simulations and enable a better and more accurate design of the forming process technology. Currently, great emphasis is placed on a stable pressing process, a process without defects, and the greatest possible use of the material in terms of achievable deformations.…”

Section: Introductionmentioning

confidence: 99%

Effect of tool speed on FLC curve position for DX56D

Novák

Tatíček²

2023

Preprint

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Experimentally determined forming limit curves (FLC) are often used to evaluate formability in sheet metal forming. These curves represent the limits of the formability of the material. The most widely used procedure for the experimental determination of the breaking point of sheet metal is formulated in EN ISO 12004-2. The FLC curve was measured for material DX56D + Z100-M-C-O using the Nakajima test on a BUP 600 universal test machine. The test setup and sample shape correspond to EN ISO 12004-2 except for the punching speed, which was increased from 2 mm/s to 10, 14, and 17 mm/s against the conditions defined in the standard. A non-contact optical system ARAMIS from GOM was used to measure the deformation. A stochastic pattern was applied to the samples to ensure the quality of the measurements, and the Erichsen adhesion test was performed. To determine other properties of the material, the microstructure of the material in the fracture area was observed in the metallographically prepared samples. During analysis, the microstructure was monitored with regard to the state of deformation (deep drawing, plane deformation, and more axial stress). Observations were made on samples with an etched structure using an optical microscope and an electron microscope, where, among other things, the distribution of particles, their size, and chemical composition were observed.

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The coupling influence of size effects and strain rates on the formability of austenitic stainless steel 304 foil

Cited by 19 publications

References 6 publications

Understanding Size Effects and Forming Limits in the Micro-Stamping of Industrial Stainless Steel Foils

Understanding Size Effects and Forming Limits in the Micro-Stamping of Industrial Stainless Steel Foils

Mechanical Properties Involved in the Micro-forming of Ultra-thin Stainless Steel Sheets

Effect of tool speed on FLC curve position for DX56D

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