Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 807, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.140880
Keywords
Selective laser melting; Ti-6Al-4V; Scanning speed; Laser power; Tensile properties
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2020R1C1C1006214]
- Korea government (MSIP) [NRF-2018R1A5A6075959]
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In order to compensate for the porosity of high-speed printed Ti-6Al-4V specimens, a hot isostatic pressing (HIP) process was applied, which led to a deterioration phenomenon critically affected by the surface roughness of the as-built state. Efficient control can be achieved through setting the build angle.
Despite recent progress in achieving high mechanical properties of 3D printed metal products, the low productivity still remains a major limitation for their cost-effective feasibility in practical applications. To achieve high-speed printing with affordable mechanical properties, we increased the scanning speed of selective laser melting process with Ti-6Al-4V up to 1800 mm/s and applied a hot isostatic pressing (HIP) process to compensate for the porosity. In these high-speed printed specimens, the HIP process led to a microstructural change from alpha'-lath martensite to a Widmanstatten a-lamellar structure, which deteriorated their tensile properties due to the segregation of beta-stabilizing atoms and caused inter-lamellar fracture. The deterioration phenomenon of high-speed printed Ti-6Al-4V specimens after the HIP process was found to be critically affected by the surface roughness of as-built state, which can be efficiently controlled with a build angle set-up.
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