期刊
VIRTUAL AND PHYSICAL PROTOTYPING
卷 15, 期 3, 页码 251-264出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/17452759.2020.1733430
关键词
3D printing; electron beam melting; elongation; defects; lack of fusion
资金
- A*STAR Industrial Additive Manufacturing Program: Work Package 3 (Electron Beam Melting) [1325504103]
- A*STAR Additive Manufacturing Centre (AMC) Initiative: Work Package 1 (High Temperature Materials Development for 3D Additive Manufacturing) [1426800088]
To evaluate specimen size dependence on the tensile properties of additively manufactured (AM) components, various rectangular specimens, ranging from miniaturised to ASTM standard specimens, are machined from electron beam melted Ti-6Al-4V and used for the tensile testing. It is found that the elongation is strongly related to the sample size while the yield and ultimate tensile strengths exhibit an independent feature. Three major aspects, (i) presented location of lack of fusion, (ii) size and segregation of pores, and (iii) slimness ratio, have a synergic influence on the elongation of different specimen sizes with various cross-section area. Our findings suggest that microscale tests arise uncertainties in measurement, which must be considered in order to provide quantifiable levels of confidence when applying such tests to discriminate a material's behaviour. The experimental results and analyses provide a guideline for the design and testing of non-standard specimens for AM components.
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