Microstructure and mechanical properties of CuSn/18Ni300 bimetallic porous structures manufactured by selective laser melting

被引：68
|
作者：
Zhang, Mingkang [1 ]
Yang, Yongqiang [1 ]
Wang, Di [1 ]
Song, Changhui [1 ]
Chen, Jie [1 ]
机构：
[1] South China Univ Technol, Sch Mech & Automot Engn, Guangzhou, Guangdong, Peoples R China
来源：
MATERIALS & DESIGN | 2019年 / 165卷
基金：
中国国家自然科学基金;
关键词：
CuSn alloy; 18Ni300 maraging steel; Bimetallic; Porous structures; Selective laser melting; INTERFACIAL CHARACTERIZATION; MARAGING-STEEL; SLM PARTS; SCAFFOLDS; BEHAVIOR;
D O I：
10.1016/j.matdes.2019.107583
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This article presents a method for manufacturing CuSn/18Ni300 bimetallic porous structure, and it mainly aims to discover microstructure and mechanical properties of CuSn/18Ni300 bimetallic porous structure. The micro-structure, bonding strength and fracture morphology of CuSn/18Ni300 bimetallic parts manufactured by selective laser melting were examined by X-ray diffraction, tensile test and scanning electron microscopy, respectively. Compression behavior and energy absorption behavior were investigated by compression tests. Analyses of microstructure show that CuSn/18Ni300 specimen consists of alpha-Fe phase, alpha-Fe/alpha-Cu mixed area and alpha-Cu phase. Microhardness at the interface of CuSn/18Ni300 bimetallic porous structure decreases from 18Ni300 part to CuSn part. The bonding strength of CuSn/18Ni300 specimen is 144.1 +/- 41.59 MPa, which is much lower than the tensile strength of CuSn specimen. Additionally, we demonstrate that the compression behavior of CuSn/18Ni300 bimetallic porous structure can be subdivided into five stages, including the first linear elasticity, the first collapse plateau, the second linear elasticity, the second collapse plateau and the end densification. The energy absorption of CuSn/18Ni300 porous structure is higher than that of CuSn porous structure, and energy absorption increases as the porosity decreases. These findings provide a solution for optimizing the compression behavior and energy absorption of porous structure. (c) 2019 Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.
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页数：12
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