Mechanical
alloying
and
situ
synthesis
by
vacuum
sintering
were
used
to
prepare
dense
WC-M2
high
speed
steel
matrix
composites
WC
(0
10
wt%).
The
effects
of
content
(mass
fraction)
second-phase
carbides
on
the
densification
mechanism,
phase
composition,
microstructure,
fracture
morphology,
mechanical
properties,
wear
properties
sintered
systematically
investigated.
experimental
results
showed
that
when
temperature
reaches
1240°C,
composite
material
specimens
can
achieve
near-total
densification,
main
phases
present
are
Martensitic,
M7C3,
M6C,
M2C,
MC,
WC,
α-Fe
γ-Fe.
appropriate
addition
modify
grain
uniformity,
reduce
microstructural
defects,
improve
comprehensive
properties.
hardness
relative
density
gradually
increased,
while
transverse
rupture
strength
impact
toughness
rose
then
declined.
friction
coefficient
sample
tends
increase
decrease,
rate
decrease
increase,
mechanism
alloy
also
changes
from
quasi-cleavage
complete
cleavage
along
crystal.
morphology
is
dominated
interfacial
separation
between
hard
particle
binder
phase,
supplemented
plastic
tearing
value
specimen
mainly
attributed
phase.
When
5%,
has
best
overall
with
toughness,
bending
strength,
reaching
13.1
J·-cm-2,
1583
Mpa,
779.5
HV,
respectively,
their
resistance
optimal
at
this
content.
Journal of Manufacturing and Materials Processing,
Год журнала:
2023,
Номер
7(1), С. 50 - 50
Опубликована: Фев. 15, 2023
During
machining
processes,
a
high
temperature
is
generated
in
the
cutting
zone
due
to
deformation
of
material
and
friction
chip
along
surface
tool.
This
has
detrimental
effect
on
tool,
for
this
reason,
it
utmost
importance
assess
real
time
during
these
processes.
Despite
all
advances
investigation
field,
accurately
measuring
remains
great
challenge.
In
sense,
work
intends
contribute
solving
problem
by
experimentally
evaluating
potential
developed
approach
embedding
thermocouples
into
rake
face
tools
dry
turning
AISI
1045
steel
different
parameters
comparing
obtained
results
with
infrared
thermography
measurements
at
exact
same
point.
A
well-defined,
smooth
micro-groove
good
quality
was
produced
laser
modification.
Then
laser-welded
K-type
thermocouple
fixated
MgO
ceramic
adhesive,
ensuring
protection
from
wear
chips,
which
allowed
creation
WC-Co
inserts
ability
measure
tool
maximum
error
0.96%.
Results
showed
that,
despite
yielding
trend,
measured
IR
thermographic
camera
always
lower
than
embedded
thermocouple.
The
proposed
method
proved
be
reliable,
precise,
accurate,
cost-effective
real-time
measurement
capable
providing
useful
information
parameter
optimization,
thus
allowing
increased
productivity
life.
Journal of Manufacturing Processes,
Год журнала:
2024,
Номер
118, С. 163 - 172
Опубликована: Март 20, 2024
During
machining
processes,
due
to
deformation
of
the
material
and
friction
chip
along
tool
surface,
a
significant
amount
heat
is
generated,
particularly
in
cutting
zone,
thus
leading
wear
increase
consequent
life
reduction.
Therefore,
ability
assess
temperature
real
time
extremely
important
better
understand
generation,
contributing
development
more
effective
strategies
for
reducing
costs
increasing
productivity.
This
work
proposes
fabrication
embedded
additively
manufactured
K-type
N-type
thermocouples
sintered
WC-Co
substrates
by
multi-material
laser
powder
bed
fusion
measurement
time.
Results
showed
that
this
approach
able
produce
dense
continuous
with
no
evidence
severe
defects,
being
found
calibration
tests
linear
relationship
temperature,
Seebeck
coefficient
at
20
°C
40.8
μV/°C
16.5
thermocouples.
Turning
revealed
developed
manufacturing
tools
3D
printed
measure
precisely
accurately
during
processes.
Coatings,
Год журнала:
2023,
Номер
13(6), С. 1090 - 1090
Опубликована: Июнь 13, 2023
To
determine
the
optimal
process
parameters
for
preparation
of
a
Co-based
alloy
cladding
layer,
experimental
research
laser
was
carried
out
based
on
window
and
grey
relational
analysis
methods
with
42CrMo
as
substrate.
The
variance
(ANOVA)
used
to
explore
influence
laws
forming
characteristics
layer
within
range.
Furthermore,
parameter
combination
obtained
by
analysis,
verification
optimization
results
conducted.
It
found
that
interval
determined
power
1300–2100
W,
scanning
speed
6–14
mm/s,
powder
feeding
rate
17.90–29.84
g/min.
order
each
was:
>
rate.
2100
6
17.90
g/min
were
obtained.
proved
correlation
grade
optimized
improved
0.260
compared
initial
agreed
well
prediction
value
an
accuracy
96%.
After
optimization,
cross-sectional
area,
ratio
width
height,
efficiency,
utilization
track
increased
4.065
mm2,
1.031,
19.032,
70.3%,
respectively,
fluctuation
decreased
60.9%.
bonded
substrate
without
cracks,
holes,
evident
element
segregation,
included
phases
Cr3C7,
CoCx,
fcc-Co,
WC.
Materials,
Год журнала:
2023,
Номер
16(17), С. 5933 - 5933
Опубликована: Авг. 30, 2023
Additive
manufacturing
(AM)
of
stainless
steel
is
more
difficult
than
other
metallic
materials,
as
the
major
alloying
elements
are
prone
to
oxidation
during
fabrication
process.
In
current
work,
specimens
316L
were
made
by
powder
laser
bed
fusion
(P-LBF)
additive
These
investigated
electron
microscopy
and
micro-/nano-indentation
techniques
investigate
microstructural
aspects
mechanical
properties,
respectively.
Compositionally,
a
similar
wrought
was
subjected
identical
investigation,
used
benchmark
material.
The
microstructure
P-LBF-processed
alloy
shows
both
equiaxed
elongated
grains,
which
marginally
smaller
(3.2–3.4
μm)
that
counterpart
(3.6
μm).
Withstanding
such
marginal
gain
size
refinement,
increase
in
shear
stress
hardness
L-PBF
striking.
L-PBF-processed
possess
about
1.92–2.12
GPa
hardness,
1.5
times
higher
(1.30
GPa),
1.15
resistant
against
plastic
flow
Similarly,
maximum
(274.5–294.4
MPa)
(175.9
MPa).
