Investigating mechanical and surface porosity values of high-performing 3D-printed titanium alloys along with stress-relieving heat treatments

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Subeshan, Balakrishnan
Asmatulu, Eylem
Ma, Annie Tran
Bakir, M.
Asmatulu, Ramazan
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Direct metal laser sintering , Heat treatment , Mechanical and surface properties , Metal additive manufacturing , Ti$_6$Al$_4$V powder
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Subeshan, B., Asmatulu, E., Ma, A.T. et al. Investigating mechanical and surface porosity values of high-performing 3D-printed titanium alloys along with stress-relieving heat treatments. Int J Adv Manuf Technol (2023).

Additive manufacturing using metal powders is becoming increasingly popular due to its versatility in creating structural components of various shapes. Among the various additive manufacturing methods (or 3D printing), direct metal laser sintering (DMLS) is one of the most frequently used technologies. The material most frequently used in DMLS technology is the titanium (TiAlV) alloy, widely preferred in defense, aerospace, automotive, energy, and biomedical industries. This research study examines the mechanical and surface porosity and roughness properties of the 3D-printed TiAlV (Grade 23) alloy specimens. In addition to additive manufacturing, a post-processing treatment known as stress-relieving (SR) heat treatment is also utilized for additively manufactured specimens. Four differently shaped walls (diamond, square, circle, and hexagon) were additively manufactured. The mechanical properties of the 3D-printed TiAlV alloy specimens were tested using compression testing and hardness tests using Rockwell and Vickers scales. These tests were conducted before and after post-process SR heat treatment. Additionally, surface roughness analysis was conducted on the specimens to determine any changes in the material's surface properties after the SR heat treatment. It was observed that the heat-treated (HT) specimens existed to have more cracks and oxidation compared to the non-heat-treated (NHT) ones. According to the surface roughness results, the circular-shaped heat-treated wall (CSHTW) specimen has the lowest average roughness (Ra) value of 210.31 µin (5.34 µm), and the corresponding maximum height (Rz) was 897.99 µin (22.81 µm). Also, the average Rockwell hardness value of the HT specimens was reported to present an increase of approximately 3% compared to the NHT specimens. The diamond-shaped heat-treated wall (DSHTW) specimen exhibited the highest Vickers hardness value of 605.08 (± 233.98) HV. It was found that the CSHTW specimens had the highest elastic modulus and yield strengths among all the geometries, with a value 38 GPa and 1380 MPa, respectively, indicating that they could resist deformation better than the other specimens. Overall, this study is important because additively manufactured TiAlV alloy components are increasingly used in many industries, as it offers significant reductions in costs, material waste, manufacturing lead times, and improved performance outcomes.

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Springer Science and Business Media Deutschland GmbH
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International Journal of Advanced Manufacturing Technology
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