Author(s)

B.M. Dariani & A. Sadough

Abstract

Sheet metal forming processes are generally limited by plastic instability and tearing. The acceptable strain limits during such processing of sheet materials can be assessed by a forming limit diagram (FLD). In this research formability properties of stainless steels and the effect of inartensite transformation during plastic deformation on this property are studied. The formability properties of austenitic and ferritic stainless steel are studied in both theoretical and experimental approaches, using the concept of forming limit diagram. In the theoretical approach a localized necking model and the Hill's quadratic anisotropy yield criterion are used and the material is considered to be strain hardened and sensitive to the strain rate. The experimental FLD are obtain

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