Modeling tensile strength of austenitic graded steel based on the strain gradient plasticity theory

Functionally graded austenitic steel was produced by setting the austenitic and carbon steels with appropriate thickness as electrode through electroslag refining. Tensile stress of specimen has been studied and modeled regarding the mechanism-based strain gradient plasticity theory. Tensile strength of the composites depends on the composition and volume fraction of the layers. The yield stress of each element was related to the density of the statistically stored dislocations of that element and assuming Holloman relation for the corresponding stress–strain curves, tensile strengths of the composites were determined via numerical method by applying the rule of mixtures. The obtained results of the proposed model are in good agreement with the experimental results.

Research highlightsProduction of FGSs by electroslag remelting. Strain gradient plasticity theory for strength prediction. Profile of statistically stored and geometrically necessary dislocations.