Reverse effect of hot isostatic pressing on high-speed selective laser melted Ti-6Al-4V alloy
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- Reverse effect of hot isostatic pressing on high-speed selective laser melted Ti-6Al-4V alloy
- Lee, Jungsub; Ha, Hyunjong; Seol, Jae Bok; Kim, Jung Gi; Seo, Eun Hyeok; Moon, Seung Ki; Jung, Im Doo; Sung, Hyokyung
- Issue Date
- ELSEVIER SCIENCE SA
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.807, pp.140880
- 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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