Powder sheet additive manufacturing of multi-material structures: Experimental and computational characterizations

• Published in: Composites. Part B, Engineering Vol. 272; p. 111203
• Main Authors: Zhang, Wenyou, Lu, Xufei, Coban, Asli, Cervera, Miguel, Chiumenti, Michele, Sasnauskas, Arnoldas, Huang, Chunjie, Yin, Shuo, Babu, Ramesh Padamati, Lupoi, Rocco
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2024
• Subjects: Defect control; Manufacturability; Multi-material structures; Powder sheet additive manufacturing; Thermo-mechanical simulation; Multi-material structures; Manufacturability; Defect control; Thermo-mechanical simulation; Powder sheet additive manufacturing
• ISSN: 1359-8368; 1879-1069
• DOI: 10.1016/j.compositesb.2024.111203

Selective laser melting (SLM) of multi-material structures (MMS) is of significance because it allows for bespoke structural innovation and high-accuracy process tailoring. However, most of the currently developed loose powder-based SLM techniques for MMS are limited by the long changeover time and potential cross-contamination between materials. To address these issues, a novel Metal Additive Manufacturing using Powder Sheets (MAPS) technique is proposed for printing MMS within a single process. It utilizes flexible powder sheets as the feedstock material, which are composed of metal powder-polymer binder composites. The printability of MMS by MAPS is assessed through the fabrication of three-phase SS304-IN718-SS304 composites with increased geometric dimensions on the SS316 baseplates. The effects of part size on the evolution of the melt-pool morphology and the formation of defects during MAPS are investigated by experimental characterizations and computational modeling. The results show that when fabricating larger MMS, the use of a longer scan-vector easily leads to defects such as lack-of-fusion porosity, balling and cracks. This is due to the longer duration of inter-hatch cooling time, the reduced amount of thermal accumulation and the higher degree of residual stresses. By adopting an island scanning strategy, a defect-free large-size MMS with variations of chemical composition, microstructure and microhardness is successfully printed by MAPS. The proposed MAPS method offers a new solution for producing high-quality MMS.