Additive manufacturing of multi-materials with interfacial component gradient by in-situ powder mixing and laser powder bed fusion

Liu，Linqing1; Wang，Di1; Han，Changjun1; Li，Yang1; Wang，Tianyu1; Wei，Yang1; Zhou，Wei2; Yan，Ming3; Liu，Yang4; Wei，Shaochong5; Yang，Yongqiang1

2024-03-25

10.1016/j.jallcom.2024.173508

Journal of Alloys and Compounds   影响因子和分区

0925-8388

Defects (e.g., pores and cracks) and high stress concentration derived from the significant mutation in materials are the critical challenge for multi-material structures fabricated by laser powder bed fusion (LPBF). Introducing a transition zone between dissimilar materials with a composition gradient at the interface may be a promising approach to resolve or minimize these problems. In this work, three distinct CuSn10 copper alloy (CuA)/316 L stainless steel (SS) multi-material gradient structures (i.e., CS, SC-1, and SC-2) were fabricated by a LPBF system with in-situ powder mixing and feeding capability. A buffer layer material based on the mixture of the two base materials was introduced at the interface between CuA and SS. The effects of the building strategies and interfacial composition gradient transition paths on the interfacial bonding characteristics were investigated. The microstructure evolution and the underlying interfacial bonding mechanisms were discussed. It was found that the interfacial bonding behaviors were critically dependent on the occurrence of liquid metal embrittlement induced by Cu penetration into Fe grains, as well as the width and microstructure gradient of the diffusion zone and high stress concentration at the interface. A non-uniform melting behavior of CuA and SS powders could be induced by the distinct thermal-physical properties between the two materials, which could lead to lack-of-fusion pores at the interface. In the CS sample, printing SS on the CuA with a buffer layer material could inhibit the formation of Cu-penetration cracks and increase the width of the diffusion zone, which may enhance the interfacial metallurgical bonding. This work may enhance the essential comprehension of improving interfacial bonding strength of LPBF-processed multi-material structures.

Functionally graded materials In-situ powder mixing Laser powder bed fusion Multi-material structure

SCI ; EI

英语

其他

MATERIALS SCIENCE

2-s2.0-85182891890

Scopus

1.School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou,510641,China
2.Department of Mechanical & Electrical Engineering,Xiamen University,Xiamen,361101,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Laboratory of Impact and Safety Engineering,Ministry of Education,Ningbo University,Ningbo,315211,China
5.Suzhou Nuclear Power Institute,Jiangsu,215004,China

Liu，Linqing,Wang，Di,Han，Changjun,et al. Additive manufacturing of multi-materials with interfacial component gradient by in-situ powder mixing and laser powder bed fusion[J]. Journal of Alloys and Compounds,2024,978.

Liu，Linqing.,Wang，Di.,Han，Changjun.,Li，Yang.,Wang，Tianyu.,...&Yang，Yongqiang.(2024).Additive manufacturing of multi-materials with interfacial component gradient by in-situ powder mixing and laser powder bed fusion.Journal of Alloys and Compounds,978.

Liu，Linqing,et al."Additive manufacturing of multi-materials with interfacial component gradient by in-situ powder mixing and laser powder bed fusion".Journal of Alloys and Compounds 978(2024).