Pauzon, Camille;
Van Petegem, Steven;
Hryha, Eduard;
Sin Ting Chang, Cynthia;
Hocine, Samy;
Van Swygenhoven, Helena;
de Formanoir, Charlotte;
(2022)
Effect of helium as process gas on laser powder bed fusion of Ti-6Al-4V studied with operando diffraction and radiography.
European Journal of Materials
, 2
(1)
pp. 422-435.
10.1080/26889277.2022.2081622.
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Abstract
The utilisation of helium as process gas in laser powder bed fusion (LPBF) limits the generation of Ti-6Al-4V hot and incandescent spatters and enhances their cooling rate. In the present study, operando X-ray diffraction using synchrotron X-rays permits to verify that the cooling rates experienced by the deposited material are not significantly affected by the process gas unlike spatters. Topography measurements of the top printed surface reveal lower roughness of He-produced samples, attributed to the previously observed reduction of spatters with He and thus a reduction of redepositions on the powder bed and printed surfaces. Operando radiography provides with insights on the spatter formation mechanisms namely particle entrainment, agglomeration, melting and spheroidization.
| Type: | Article |
|---|---|
| Title: | Effect of helium as process gas on laser powder bed fusion of Ti-6Al-4V studied with operando diffraction and radiography |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1080/26889277.2022.2081622 |
| Publisher version: | https://doi.org/10.1080/26889277.2022.2081622 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Laser powder bed fusion, Operando X-ray diffraction, Operando radiography, process gas, Spatters, Helium |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10149919 |
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