Speaker
Description
Laser powder bed fusion (L-PBF) is a complex process in which many parameters intervene and interfere with each other and can have a significant impact on the melting behavior. Few of them: laser power, scan speed, hatch distance; are usually considered when developing the process while others such as powder size and gas atmosphere are most often neglected. The gas is an important parameter of the process as it prevents oxidation of the material and removes process by-products from the process chamber.
This study focuses on the effect of the process gas and O2 content, on spatter formation and process stability during L-PBF of Ti-6Al-4V lattice structures and resulting properties.
Results from optical tomography showed that spatter emission was reduced when working with argon-helium mixtures compared to argon and even more so when working with helium. Process stability was improved similarly. The use of argon-helium mixtures was effective in reducing porosity content according to micro-computed tomography analyses, while the compression properties remained comparable to parts processed with Argon only.
| Speaker Country | France |
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