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at O
a O
1.5 O
L/min O
nitrogen B-PARA
flow I-PARA
rate E-PARA
. O
The O
technique O
developed O
in O
this O
work O
provides O
a O
feasible O
route O
to O
additively O
construct O
single-channel O
multilayer O
structures O
with O
spatial B-CHAR
distributions E-CHAR
of O
the O
composition S-CONPRI
and O
microstructures S-MATE
. O
Direct O
observation O
of O
pore S-PRO
formation O
dynamics O
during O
LPBF S-MANP
additive B-MANP
manufacturing E-MANP
. O
Revealed O
three O
new O
pore S-PRO
formation O
mechanisms O
. O
Reconfirmed O
three O
previously O
studied O
pore S-PRO
formation O
mechanisms O
Laser B-MANP
powder I-MANP
bed I-MANP
fusion E-MANP
( O
LPBF S-MANP
) O
is O
a O
3D B-ENAT
printing I-ENAT
technology E-ENAT
that O
can O
print S-MANP
parts O
with O
complex B-CONPRI
geometries E-CONPRI
that O
are O
unachievable O
by O
conventional B-MANP
manufacturing E-MANP
technologies O
. O
However O
, O
pores S-PRO
formed O
during O