The size effect on forming quality of Ti–6Al–4V solid struts fabricated via laser powder bed fusion

Liang, Huixin, Xie, Deqiao, Mao, Yuyi, Shi, Jianping, Wang, Changjiang, Shen, Lida and Tian, Zongjun (2019) The size effect on forming quality of Ti–6Al–4V solid struts fabricated via laser powder bed fusion. Metals, 9 (4). 416 1-12. ISSN 2075-4701

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Laser powder bed fusion (LPBF) is useful for manufacturing complex structures; however, factors affecting the forming quality have not been clearly researched. This study aimed to clarify the influence of geometric characteristic size on the forming quality of solid struts. Ti–6Al–4V struts with a square section on the side length (0.4 to 1.4 mm) were fabricated with different scan speeds. Micro-computed tomography was used to detect the struts’ profile error and defect distribution. Scanning electron microscopy and light microscopy were used to characterize the samples’ microstructure. Nanoindentation tests were conducted to evaluate the mechanical properties. The experimental results illustrated that geometric characteristic size influenced the struts’ physical characteristics by affecting the cooling condition. This size effect became obvious when the geometric characteristic size and the scan speed were both relatively small. The solid struts with smaller geometric characteristic size had more obvious size error. When the geometric characteristic size was smaller than 1 mm, the nanohardness and elastic modulus increased with the increase in scan speed, and decreased with the decline of the geometric characteristic size. Therefore, a relatively high scan speed should be selected for LPBF—the manufacturing of a porous structure, whose struts have small geometric characteristic size.

Item Type: Article
Keywords: selective laser melting; Ti–6Al–4V alloy; metallurgical quality; mechanical properties
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Dynamics, Control and Vehicle Research Group
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA0174 Engineering design
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Depositing User: Chang Wang
Date Deposited: 12 Apr 2019 12:00
Last Modified: 01 Jul 2019 16:30

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