Effect of helium as process gas on laser powder bed fusion of Ti-6Al-4V studied with operando diffraction and radiography
Artikel i vetenskaplig tidskrift, 2022

The utilisation of helium as process gas in laser powder bed fusion 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.Highlights The top surface average roughness of samples produced with He is lower than that of Ar equivalent Deposited Ti-6Al-4V cooling rates during LPBF are not significantly affected by the use of He Grain size and orientation of Ti-6Al-4V is similar when processing under Ar, He, and a mixture of both Operando radiography permits to identify the mechanisms of Ti-6Al-4V spatter formation.

laser powder bed fusion

Helium

operando radiography

operando X-ray diffraction

process gas

spatters

Författare

Camille Nicole Géraldine Pauzon

Chalmers, Industri- och materialvetenskap, Material och tillverkning

S. Van Petegem

Paul Scherrer Institut

Eduard Hryha

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Cynthia Sin Ting Chang

Paul Scherrer Institut

ANAXAM

Samy Hocine

Paul Scherrer Institut

Ecole Polytechnique Federale de Lausanne (EPFL)

Helena Van Swygenhoven

Paul Scherrer Institut

Ecole Polytechnique Federale de Lausanne (EPFL)

Charlotte de Formanoir

Ecole Polytechnique Federale de Lausanne (EPFL)

S. Dubiez-Le Goff

Linde GmbH

European Journal of Materials

26889277 (eISSN)

Vol. 2 1 422-435

Ämneskategorier

Energiteknik

Bearbetnings-, yt- och fogningsteknik

Materialkemi

Metallurgi och metalliska material

DOI

10.1080/26889277.2022.2081622

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Senast uppdaterat

2024-01-29