Canadian Metallurgical Quarterly,
Год журнала:
2024,
Номер
unknown, С. 1 - 8
Опубликована: Окт. 17, 2024
The
direct
metal
laser
sintering
process
is
used
to
develop
the
nickel
base
superalloy
DMLS
In718
for
experimentation.
alloy
evaluated
ensure
metallurgical
qualities
and
mechanical
properties.
Microstructure
of
anisotropic
in
nature
hatch
bands
are
clear
infer.
hardness
275
Hv
which
equivalent
commercially
available
inconel718
material.
strength
density
justifiable
commercial
machining
studies
performed
with
electro
spark
erosion
report
on
surface
quality,
kerf
taper
material
removal
rate.
minimum
pulse
time
has
produced
a
fine
quality
compared
maximum
condition.
topography
terms
oxide
scale
recast
layers
identified
during
inefficient
conditions.
This
paper
was
an
opportunity
deliberate
wire
process.
Journal of Materials Research and Technology,
Год журнала:
2023,
Номер
27, С. 4157 - 4168
Опубликована: Ноя. 1, 2023
In
recent
years,
the
demand
for
high
strength
materials
such
as
aerospace,
offshore
plant,
energy,
and
manufacturing
has
increased
due
to
need
stability
reliability
in
severe
environments.
Especially,
Inconel
718,
a
nickel-based
superalloy
with
excellent
properties,
is
widely
used.
718
undergoes
two-step
process,
including
solution
heat
treatment
aging,
control
its
mechanical
properties.
The
alloy's
relies
on
precipitation
phases
like
MC
carbides,
Gamma
prime
(γ′),
double
(γ'´),
influenced
by
aging
conditions.
this
study,
we
tried
investigate
correlation
between
behavior
of
precipitates
properties
according
primary
temperature.
addition,
hardening
various
conditions
was
investigated
through
analysis
microstructure,
SEM,
EDS
TEM.
highest
hardness,
coupled
reduced
impact
toughness,
were
observed
after
at
°C
an
increase
size
quantity
γ′
γ'´
precipitates.
result
fracture
surface
Charpy
test
specimen,
intergranular
abundant
small-sized
formed
within
boundary.
Journal of Materials Research and Technology,
Год журнала:
2023,
Номер
27, С. 4248 - 4255
Опубликована: Ноя. 1, 2023
While
direct
aging
of
Inconel
718
nickel-based
superalloy
from
the
as-built
state
is
known
as
a
promising
practice
to
tune
mechanical
properties,
precipitation
kinetics
γ˝
phase,
main
precipitating
has
received
less
attention.
Accordingly,
in
present
work,
post-processing
form
treatment
manufactured
by
laser
powder
bed
fusion
additive
manufacturing,
also
selective
melting
(SLM),
was
systematically
investigated
microstructural
analysis
and
hardness
measurements.
It
revealed
that
peak
aged
condition
for
can
be
achieved
at
much
shorter
holding
times
compared
after
homogenization/solutionizing
heat
treatment.
Moreover,
Johnson–Mehl–Avrami–Kolmogorov
(JMAK)
based
on
both
measurements
were
applied
unravel
kinetics,
which
respectively
led
activation
energies
160
157
kJ/mol,
are
consistent
with
energy
diffusion
Nb
IN718
SLM.
Lifshitz–Slyozov–Wagner
(LSW)
diffusion-controlled
growth
theory
modified
become
applicable
investigating
during
evolution
volume
fraction
kJ/mol.
These
results
shed
light
procedures
used
additively
superalloy.
Integrating materials and manufacturing innovation,
Год журнала:
2024,
Номер
13(1), С. 185 - 200
Опубликована: Фев. 5, 2024
Abstract
Additive
manufacturing
(AM)
technologies
offer
unprecedented
design
flexibility
but
are
limited
by
a
lack
of
understanding
the
material
microstructure
formed
under
their
extreme
and
transient
processing
conditions
its
subsequent
transformation
during
post-build
processing.
As
part
2022
AM
Bench
Challenge,
sponsored
National
Institute
Standards
Technology,
this
study
focuses
on
phase
composition
evolution
nickel
alloy
718,
nickel-based
superalloy,
to
provide
benchmark
data
essential
for
validation
computational
models
microstructural
predictions.
We
employed
high-energy
synchrotron
X-ray
diffraction,
in
situ
scattering,
as
well
high-resolution
transmission
electron
microscopy
our
analyses.
The
uncovers
critical
aspects
as-built
state,
homogenization,
aging
heat
treatment.
Specifically,
we
identified
secondary
phases,
monitored
dissolution
coarsening
elements,
observed
formation
stability
γ
’
”
phases.
results
rigorous
required
understand
atomic
transformations
thereby
enhancing
reliability
applicability
predicting
mechanical
properties.
