Mechanical Behavior and Failure Mechanism of Nb-Clad Stainless Steel Sheets

Event
SAE World Congress & Exhibition
Authors Abstract
Content
Because niobium-clad 304L stainless steel sheets are considered for use as bipolar plates in polymer electrolyte membrane (PEM) fuel cells, their mechanical behavior and failure mechanism are important to be examined. As-rolled and annealed specimens were tested in tension, bending and flattening. The effects of annealing temperature and time on the mechanical behavior and failure mechanism were investigated. Micrographic analyses of bent and flattened specimens showed that the as-rolled specimens have limited ductility and that the annealed specimens can develop an intermetallic layer of thickness of a few microns. The annealed specimens failed due to the breakage of intermetallic layer causing localized necking and the subsequent failure of Nb layer. The springback angles of the as-rolled and annealed specimens were also obtained from guided-bend tests. Nano-indentation tests indicated that the intermetallic layer exhibit much higher values of hardness and elastic modulus as compared to those of the stainless steel and Nb sheets.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-1393
Pages
8
Citation
Asim, K., Hosford, W., Pan, J., Hong, S. et al., "Mechanical Behavior and Failure Mechanism of Nb-Clad Stainless Steel Sheets," SAE Int. J. Mater. Manf. 2(1):547-554, 2009, https://doi.org/10.4271/2009-01-1393.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-1393
Content Type
Journal Article
Language
English