Virtual and Physical Prototyping,
Год журнала:
2024,
Номер
19(1)
Опубликована: Март 13, 2024
Unintended
end-of-process
depression
(EOPD)
commonly
occurs
in
laser
powder
bed
fusion
(LPBF),
leading
to
poor
surface
quality
and
lower
fatigue
strength,
especially
for
many
implants.
In
this
study,
a
high-fidelity
multi-physics
meso-scale
simulation
model
is
developed
uncover
the
forming
mechanism
of
defect.
A
defect-process
map
EOPD
phenomenon
obtained
using
model.
It
found
that
formation
mechanisms
are
different
under
distinct
regions
process
parameters.
At
low
scanning
speeds
keyhole
mode,
long-lasting
recoil
pressure
large
temperature
gradient
easily
induce
EOPD.
While
at
high
shallow
molten
pool
morphology
solidification
rate
allow
evolve
into
an
quickly.
Nevertheless,
conduction
Marangoni
effects
along
with
faster
Finally,
'step'
variable
power
strategy
proposed
optimise
defects
case
volumetric
energy
density
speeds.
This
work
provides
profound
understanding
valuable
insights
control
LPBF
fabrication.
Journal of Magnesium and Alloys,
Год журнала:
2023,
Номер
11(7), С. 2585 - 2599
Опубликована: Июль 1, 2023
Nano-sized
reinforcements
improved
the
mechanical
characteristics
efficiently
by
promoting
more
implicit
particle
hardening
mechanisms
compared
to
micron-sized
reinforcements.
particles
lessen
critical
solidification
velocity
for
swamp
and
thus
offers
better
dispersal.
In
present
investigation,
friction
stir
processing
(FSP)
is
utilized
produce
AZ31/Al2O3
nanocomposites
at
various
tool
rotation
speeds
(i.e.,
900,
1200,
1500
rpm)
with
an
optimized
1.5%
volume
alumina
(Al2O3)
reinforcement
ratio.
The
corrosion
behavior
of
AZ31/Al2O3-developed
was
investigated
that
AZ31
base
alloy.
alloy
experienced
a
comprehensive
dynamic
recrystallization
during
FSP,
causing
substantial
grain
refinement.
Grain-size
strengthening
primary
factor
contributed
enhancement
in
strength
fabricated
nanocomposite.
Tensile
yield
values
were
lower
than
those
metal
matrix,
although
upward
trend
both
has
been
observed
increase
speed.
An
19.72%
hardness
along
superior
resistance
achieved
rotational
speed
rpm.
currents
(Jcorr)
all
samples
dropped
speed,
contrast
potentials
(Ecorr),
which
increased.
Jcorr
42.3%,
56.8%,
65.5%
chosen
rotating
rpm,
respectively.
processed
have
addressed
this
manuscript
not
given
sufficient
attention
existing
literature.
Further,
work
effective
choice
quality
assurance
FSP
process
nanocomposites.
obtained
results
are
relevant
development
lightweight
automobile
aerospace
structures
components.
Journal of Materials Research and Technology,
Год журнала:
2024,
Номер
29, С. 1087 - 1101
Опубликована: Янв. 21, 2024
This
study
investigates
various
processing
approaches,
interface
characteristics,
and
mechanical
properties
of
an
aluminum
(Al)
matrix
composite
reinforced
with
additively
manufactured
(AM)
316L
stainless-steel
(SS)
lattice.
The
AM-316L-SS
lattice,
boasting
a
30
%
infill
density,
was
fabricated
using
the
laser
powder
bed
fusion
technique.
Al-matrix
integrated
reinforcement
through
experimentation
involving
pre-stirring
molten
Al
under
pressurized
unpressurized
die-casting
conditions.
A
well-bonded
interface,
cohesive
regions,
obtained
in
pre-stirred
structures.
In
contrast,
regions
decohesion
were
displayed
cast
structures
without
pre-stirring,
leading
to
presence
pores
manifestation
imperfect
bond
interfaces.
Compression
tests
conducted
on
sound
demonstrated
enhanced
properties,
compressive
strength
approximately
163
MPa,
significantly
higher
than
that
pure
(approximately
80
MPa).
Localized
cracking
initiated
by
stress
gradients
plastic
deformation,
microcrack
propagation
into
Al-matrix.
International Journal of Extreme Manufacturing,
Год журнала:
2024,
Номер
7(2), С. 022002 - 022002
Опубликована: Ноя. 14, 2024
Highlights
Exploring
personalized
biomedical
metal
implants
through
additive
manufacturing
(AM).
Presenting
new
load-bearing
and
biodegradable
alloys
for
implants.
Showcasing
AI
4D
printing
advancements
in
material
properties.
AM’s
roles
various
medical
fields.
Highlighting
perspectives
of
implant
technology
improved
patient
care.
