Compressive behavior of double-layered functionally graded 316L stainless steel foam

Abstract

Abstract In this study, double-layer structured 316L stainless steel foam is fabricated through a layer by layer space holder method. The fabricated foams contain uniform pore distribution and can be categorized as body centered cubic crystal structures. Each sample is made of two layers in the axial direction. To induce 51 vol.% and 62 vol.% porosity in the first and the second layers, 1.7 to 2.0 mm and 2.0 to 2.4 mm spherical carbamide particles are used, respectively. In this study, the effect of the height of each layer on the compressive behavior of the fabricated foams is investigated in detail. The results indicate that compressive deformation of the double-layered foams starts from the high porosity (62 vol.%) layer and then shifts to the low porosity (51 vol.%) layer. Deformation of the double-layered 316L foams demonstrates two plateau regions, whose lengths depend on the heights of the low and high porosity layers.