Publications

BibTex format

@article{Huang:2021:rs.3.rs-683646/v1,
author = {Huang, Y and Fleming, T and Clark, S and Marussi, S and Kamel, F and Thiyagalingam, J and Leung, CLA and Lee, P},
doi = {rs.3.rs-683646/v1},
title = {Keyhole fluctuation and pore formation mechanisms during laser powder bed fusion additive manufacturing},
url = {http://dx.doi.org/10.21203/rs.3.rs-683646/v1},
year = {2021}
}

Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - <jats:title>Abstract</jats:title>        <jats:p>Keyhole porosity is a key concern in laser powder-bed fusion (LPBF), potentially impacting component fatigue life. However, the dynamics of keyhole porosity formation, i.e., keyhole fluctuation, collapse and bubble growth and shrinkage, remain unclear. Using synchrotron X-ray imaging we reveal keyhole and bubble behaviours, quantifying their formation mechanisms. The findings support the hypotheses that: (i) keyhole porosity can initiate not only in unstable, but also transition keyhole regimes, created by high laser power-velocity conditions, causing fast radial keyhole fluctuations (~ 10 kHz); (ii) transition regime collapse tends to occur part way up the rear-wall; and (iii) immediately after keyhole collapse, the bubble grows as pressure equilibrates then shrinks due to metal-vapour condensation. Concurrent with condensation, hydrogen diffusion into the bubble slows the shrinkage and stabilises the bubble size. The physics revealed here can guide the development of real-time monitoring and control systems for keyhole porosity.</jats:p>
AU  - Huang,Y
AU  - Fleming,T
AU  - Clark,S
AU  - Marussi,S
AU  - Kamel,F
AU  - Thiyagalingam,J
AU  - Leung,CLA
AU  - Lee,P
DO  - rs.3.rs-683646/v1
PY  - 2021///
TI  - Keyhole fluctuation and pore formation mechanisms during laser powder bed fusion additive manufacturing
UR  - http://dx.doi.org/10.21203/rs.3.rs-683646/v1
ER  -

Download

ProfessorPeterLee

Contact

Location

Summary

Citation

BibTex format

RIS format (EndNote, RefMan)