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Understanding size effects and forming limits in the micro-stamping of industrial stainless steel foils

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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.

History

Journal

Metals

Volume

11

Issue

1

Pagination

1 - 21

eISSN

2075-4701

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2020, The authors

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