Specimen Dimension and Grain Size Effects on Deformation Behavior in Micro Tensile of SUS304 Stainless Steel Foil

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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Grain-size effects on the shock sensitivity of hexanitrostilbene (HNS) explosive

Combustion and Flame ◽

10.1016/0010-2180(84)90068-3 ◽

1984 ◽

Vol 56 (3) ◽

pp. 343-345 ◽

Cited By ~ 27

Author(s):

Robert E. Setchell

Keyword(s):

Grain Size ◽

Size Effects ◽

Shock Sensitivity ◽

Grain Size Effects

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Grain-Size Effects during Dynamic Recrystallization of Nickel

Metal Science ◽

10.1179/msc.1974.8.1.325 ◽

1974 ◽

Vol 8 (1) ◽

pp. 325-331 ◽

Cited By ~ 147

Author(s):

J. P. Sah ◽

G. J. Richardson ◽

C. M. Sellars

Keyword(s):

Grain Size ◽

Dynamic Recrystallization ◽

Size Effects ◽

Grain Size Effects

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Modeling of Size Effects on the Flow Stress of Type 304 Stainless Steel and Application in Coining Process

Volume 13: Processing and Engineering Applications of Novel Materials ◽

10.1115/imece2007-41971 ◽

2007 ◽

Author(s):

Gap-Yong Kim ◽

Muammer Koc ◽

Jun Ni

Keyword(s):

Grain Size ◽

Stainless Steel ◽

Flow Stress ◽

Size Effect ◽

Size Effects ◽

Specimen Size ◽

304 Stainless Steel ◽

Length Scales ◽

Type 304 ◽

Type 304 Stainless Steel

Application of microforming in various research areas has received much attention due to the increased demand for miniature metallic parts that require mass production. For the accurate analysis and design of microforming process, proper modeling of material behavior at the micro/meso-scale is necessary by considering the size effects. Two size effects are known to exist in metallic materials. One is the “grain size” effect, and the other is the “feature/specimen size” effect. This study investigated the “feature/specimen size” effect and introduced a scaling model which combined both feature/specimen and grain size effects. Predicted size effects were compared with experiments obtained from previous research and showed a very good agreement. The model was also applied to forming of micro-features by coining. A flow stress model for Type 304 stainless steel taking into consideration the effect of the grain and feature size was developed and implemented into a finite element simulation tool for an accurate numerical analysis. The scaling model offered a simple way to model the size effect down to length scales of a couple of grains and extended the use of continuum plasticity theories to micro/meso-length scales.

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