Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 802, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.140642
Keywords
Additive manufacturing; Interface strengthening; Functionally graded material (FGM); Multi-materials; Bonding strength
Categories
Funding
- National Natural Science Foundation of China [52005189]
- Guangdong Special Support Program [2019BT02C629]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110542, 2019B1515120094]
- Chinese Postdoctoral Science Foundation [2020M672617]
- Guangzhou Science and Technology Society Project [X20200301015]
- Guangdong Academy of Sciences [2019GDASYL0501009, 2010GDASYL-0402005, 2018GDASCX-0402]
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Functional multi-material additive manufacturing (AM) optimizes interfacial melting strategy to achieve reliable bonding interface, with interfacial microstructural analysis suggesting intense interfacial elements diffusion contributes to metallurgical bonding.
Functional multi-material additive manufacturing (AM) provides a novel way to process components with high structural complexity, functionality and good bond strength. In addition to laser processing parameter, here we investigated the effect of the elemental composition of materials on the interfacial bond strength through laser powder bed fusion (LPBF) of two-type iron-based multi-materials. The interfacial melting strategy is optimised for achieving reliable bonding interface, and the bonding reliability was evaluated by multiple mechanical testing. The interfacial microstructural analysis suggests that the intense interfacial elements diffusion contributes to metallurgical bonding. Gradient on the grain size distribution is observed concurrently with low-micro strain in bond regions. Mechanical performance is evaluated by static tensile and flexural tests, alongside with dynamic tension fatigue testing. The results reveal that the interfacial bond strength (>689 MPa) exceeds the fracture strength of substrate materials, suggesting an interface strengthening behaviour. Furthermore, an ultra strong bond interface was revealed by tension fatigue tests, which owes to Marangoni circular flows and intense elements inter-diffusion, together with a low interfacial strain. The findings shed light on AM of highly reliable multi-material components under harsh service conditions with cyclic and alternating loads.
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