Abstract
Open cell austenitic stainless steel foams having different porosities were made by impregnation of polyurethane foam followed by sintering. The austenitic stainless steel foams were characterized with respect to various techniques such as XRD, FESEM, EDX and compressive behaviour. The results show that the yield stress, elastic modulus and energy absorption are in the range of 5.2–10.5 MPa, 2.01–7.31 GPa and 1.2–3.5 MJ/m3 respectively. The yield strength, elastic modulus, average plateau stress and energy absorption increased with an increase in relative density and densification strain deceased with increase in relative density. The experimentally determined plateau stress, elastic modulus and densification strain were compared with Gibson-Ashby's relation and are found to be in close agreement. The electromagnetic interference shielding of austenitic stainless steel were measured in X-band frequency region (8.2–12.4 GHz) and found that electromagnetic interference shielding increases with relative density in all cases. The austenitic stainless steel foam has maximum electromagnetic interference shielding of −31.5 dB with absorption dominating mechanism at relative density of 0.17. This has been explained from the microstructural characteristics of austenitic stainless steel foam.
Published Version
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