Influence of depositing sequence and materials on interfacial characteristics and mechanical properties of laminated composites

Abstract

Laminated composites offer customizable properties based on applications manufactured in one operation by hybrid additive and subtractive manufacturing (HASM) technology. Such manufacturing options are fascinating, since joining two metallic materials is challenging, especially if they are two dissimilar metals without significant defects. Laminated composites were fabricated by transforming the additive manufacturing system and subtractive milling to keep the interface of the directed energy deposition smooth and clear. The microhardness, phase, oxidation, elemental content and microstructural evolution of the interface with different laminated composites were examined. The flexural strength and tensile strength of the laminated composites were measured through a three-point bending test and tensile test at room temperature. The experimental results suggest that the laminated composites had better performances than single materials of identical size. Different deposition sequences led to diverse interfacial microstructures and mechanical properties. The overall performance of laminated composites of Inconel 718 (IN718) deposited on 316L stainless steel (SS316L) was better than that of the other deposition sequence. New substances produced on the interface of SS316L and 1040 steel (1040) laminated composites obviously improved the microhardness, tensile strength and bending strength.