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Uses and properties of composite powders made by self propagating synthesis
Investigations to improve the flowability of magnetically hard powders were described. Results for flow of Ba and Sr ferrites, Sm-Co and Fe-Nd-B powders through l-5 mm orifices were presented. An automatic weigh-feeder, based on the study, was described.
STRUCTURE HOMOGENEITY AND ANNEALING RESPONSE OF MECHANICALLY ALLOYED IRON BASE POWDERS
FORECAST ON PROPERTIES OF RESONANCE TEXTURED MAGNETS
D. Jaeger,
AR.
Warrington,
UK).
J. Vernigorov et al. (Don State Technical University, Rostov-on-Don, Russia). Studies of textures in PM magnetic materials, introduced by the application of constant of fluctuating magnetic fields during processing, were described. Magnetic properties of sintered parts were shown to depend on powder characteristics and process conditions.
materials
deformation
degree
in which
of
particular
freedom.
respect
to for
with
of metal powders,
was discussed with emphasis on control of and methods were microstructure, described. Future possibilities were outlined.
Superalloys BEHAVIOPR
OF A PM NICKEL BASE SUPERALLOY AT 650°C V. Aubourg
(University
et al.
Stbver
et
of Dayton,
(Forschungzentrum
Jiilich
1150°C
and
dilatometry, was reported volume
a
with
Ni AleOs
MPa,
described.
of
superalloy,
and TiBz,
to depend
fraction
densification
based
45-180 was
of
to
continuum
powders
on
are shown
at 950.
using
HIP
Densification
on the type and
of dispersoid.
Shrinkage
contained
the
sponge
and
al.
(Polytecnico
by a wide
were described. B-Si-Fe
and
di Torino,
other
of techniques,
than and
microalloy
Flow
to depend
parameters Hardness
and base
Alloys with B-Si-Fe or Cr-
studied.
reported
range
properties
elements were
more on atomization on
melting
were shown to be related
were
spectroscopy.
The
was shown to be covered
with
possibly Ti oxycarbides,
formed
high
oxide,
up to 4 nm thick,
HSS
at
which
was
temperatures.
reduced
vacuum
heat
by
on high
treatment.
the Ti compound
AlaOs particles
formed.
PROPAGATING
Fe
dominated
the superalloy
On
grew and
OF MADE
BY SELF
SYNTHESIS (University
et al.
of Nottingham,
UK).
It was reported that SHS can be used to prepare fine dispersions of Tic and TiB in Fe and Ni matrices. The use of Tic and TiB wear resistance and other for PM and hardfacing were
HIGH
TEMPERATURE
composition. characteristics to composition.
(Moscow
Iron and Steel Inst.,
Moscow, Russia). The use of SHS to create novel ceramics, and
Structures, including sputtering deposition,
intermetallics properties cutting
targets for
was reviewed.
and tools,
and
a range
applications, magnetic
physical of
vapour
alloys
were
presented.
High alloy steels
SOLIDIFIED
BASE POWDERS et
steels
powders
which
MODIFIED PRODUCED
AND TECHNOLOGICAL OF GAS-ATOMIZED
Investigations of characteristics properties of gas atomized Ni
were
up
were described.
MORPHOLOGY PROPERTIES
alloy
Ti rich compounds,
cermets
and C, by SHS, was
from
on high speed
by Auger
E. Levashov
in an alloy matrix. Types of
made
University
Sweden).
BY
particlulate
formed
OF HIGH
(Chalmers
base
PROPAGATING SYNTHESIS
above 2500°C were reached.
to 85~01% TX
for
A REVIEW OF NOVEL ADVANCED MATERIALS MADE BY SELF
of Nottingham,
Fe-TiC
The sponge material
applications
investigated superalloy
suitable
outlined.
investigated. Ingition was at about 1100°C and the reaction was strongly exothermic.
powder
Fe
to improve applications,
SYNTHESIS
from ferro-Ti
Temperatures
other
Nottingham,
predictions.
(University
be
Gothenburg,
Surface products and
J. Wood
theory.
PRODUCTION OF POWDERS CONTAINING TITANIUM CARBIDE
et al.
to
L. Nyborg, T. Tunberg
was
Powder production/self propagating high temperature synthesis
J. Wood
and
applications.
SURFACE CLEANLINESS ALLOY METAL POWDERS
and
to depend
gave high hardness. Cr was shown to have
USES AND PROPERTIES COMPOSITE POWDERS
Jiilich,
Fe-Cr-YzOs
the theoretical
powders,
GmbH, Jiilich, Germany).
reinforced
(KFA-IWEB,
al.
HIP conditions. The experiments to validate
M. Rosso
UDIMET700,
prior
OF YTTRIA
using
Torino, Italy).
DISPERSOIDS
HIP
powder,
was reported
TITANIUM
of
making up the of these on
experimentally
Densification
hardness
hardfacing
temperature
Germany). HIP densiiication
NICKEL
Investigations
in the
and on the final structures
HIP DENSIFICATION OF NICKEL SUPERALLOY WITH ALUMINA AND
0. Hamed et al.
of the
Nottingham, UK). Production of
Dayton, Ohio, USA). Application of N18, a Ni superalloy, was described with regard to structure and properties. A model of the viscoplastic behaviour of the alloy at 625.675°C and strain rates of 10~‘-10~4sec~1,based on creep tests and electron microscopy was proposed. The results were used to construct equations linking material and energetic parameters.
DIBORIDE
were
electron levels of
inhomogeneities
SELF PROPAGATING
MODEL OF VISCOPLASTIC
and high
is an extra
Production,
consideration
powders
DISPERSION STRENGTHENED IRONCHROMIUM SUPERALLOY BY HIP
and design
there
Technology,
were discussed.
theoretically
applications,
and
consolidation
ogy of Lausanne, Lausanne, Switzerland). Materials with compositionally graded with
alloyed
recrystallization
investigated
reviewed
(ABA
distribution of compounds powder. The effects
(Swiss Federal Inst. of Technol-
heat treatment
High B contents The alloy without
of Technology,
Mechanically
N. Cherradi
were
Jones
characterized by optical microscopy used to show
D.
structures
on
high
PRODUCTION AND APPLICATIONS OF FUNCTIONALLY GRADED MATERIALS
properties,
to depend
but not pressure.
DENSIFICATION
gradients in
Functional
and hardness were reported HIP temperature
HIGH SPEED STEELS FROM RAPIDLY POWDERS
M. Miskovicova et al. (Slovak Academy of Sciences, Kosice, Slovakia). Investigations of structures and cutting properties of sintered M2 HSS were described. Atomized powders with additional Nb, Co and Ti and hot powder extrusion were used. The additional elements were shown to affect crystallization. As-consolidated the alloys were reported to have improved cutting properties in comparison with cast/ wrought materials and compared favourably with polycrystalline diamond tools.
MPR September
1996
39
STRUCTURE HOMOGENEITY AND ANNEALING RESPONSE OF MECHANICALLY ALLOYED IRON BASE POWDERS
FORECAST ON PROPERTIES OF RESONANCE TEXTURED MAGNETS
D. Jaeger,
AR.
Warrington,
UK).
J. Vernigorov et al. (Don State Technical University, Rostov-on-Don, Russia). Studies of textures in PM magnetic materials, introduced by the application of constant of fluctuating magnetic fields during processing, were described. Magnetic properties of sintered parts were shown to depend on powder characteristics and process conditions.
materials
deformation
degree
in which
of
particular
freedom.
respect
to for
with
of metal powders,
was discussed with emphasis on control of and methods were microstructure, described. Future possibilities were outlined.
Superalloys BEHAVIOPR
OF A PM NICKEL BASE SUPERALLOY AT 650°C V. Aubourg
(University
et al.
Stbver
et
of Dayton,
(Forschungzentrum
Jiilich
1150°C
and
dilatometry, was reported volume
a
with
Ni AleOs
MPa,
described.
of
superalloy,
and TiBz,
to depend
fraction
densification
based
45-180 was
of
to
continuum
powders
on
are shown
at 950.
using
HIP
Densification
on the type and
of dispersoid.
Shrinkage
contained
the
sponge
and
al.
(Polytecnico
by a wide
were described. B-Si-Fe
and
di Torino,
other
of techniques,
than and
microalloy
Flow
to depend
parameters Hardness
and base
Alloys with B-Si-Fe or Cr-
studied.
reported
range
properties
elements were
more on atomization on
melting
were shown to be related
were
spectroscopy.
The
was shown to be covered
with
possibly Ti oxycarbides,
formed
high
oxide,
up to 4 nm thick,
HSS
at
which
was
temperatures.
reduced
vacuum
heat
by
on high
treatment.
the Ti compound
AlaOs particles
formed.
PROPAGATING
Fe
dominated
the superalloy
On
grew and
OF MADE
BY SELF
SYNTHESIS (University
et al.
of Nottingham,
UK).
It was reported that SHS can be used to prepare fine dispersions of Tic and TiB in Fe and Ni matrices. The use of Tic and TiB wear resistance and other for PM and hardfacing were
HIGH
TEMPERATURE
composition. characteristics to composition.
(Moscow
Iron and Steel Inst.,
Moscow, Russia). The use of SHS to create novel ceramics, and
Structures, including sputtering deposition,
intermetallics properties cutting
targets for
was reviewed.
and tools,
and
a range
applications, magnetic
physical of
vapour
alloys
were
presented.
High alloy steels
SOLIDIFIED
BASE POWDERS et
steels
powders
which
MODIFIED PRODUCED
AND TECHNOLOGICAL OF GAS-ATOMIZED
Investigations of characteristics properties of gas atomized Ni
were
up
were described.
MORPHOLOGY PROPERTIES
alloy
Ti rich compounds,
cermets
and C, by SHS, was
from
on high speed
by Auger
E. Levashov
in an alloy matrix. Types of
made
University
Sweden).
BY
particlulate
formed
OF HIGH
(Chalmers
base
PROPAGATING SYNTHESIS
above 2500°C were reached.
to 85~01% TX
for
A REVIEW OF NOVEL ADVANCED MATERIALS MADE BY SELF
of Nottingham,
Fe-TiC
The sponge material
applications
investigated superalloy
suitable
outlined.
investigated. Ingition was at about 1100°C and the reaction was strongly exothermic.
powder
Fe
to improve applications,
SYNTHESIS
from ferro-Ti
Temperatures
other
Nottingham,
predictions.
(University
be
Gothenburg,
Surface products and
J. Wood
theory.
PRODUCTION OF POWDERS CONTAINING TITANIUM CARBIDE
et al.
to
L. Nyborg, T. Tunberg
was
Powder production/self propagating high temperature synthesis
J. Wood
and
applications.
SURFACE CLEANLINESS ALLOY METAL POWDERS
and
to depend
gave high hardness. Cr was shown to have
USES AND PROPERTIES COMPOSITE POWDERS
Jiilich,
Fe-Cr-YzOs
the theoretical
powders,
GmbH, Jiilich, Germany).
reinforced
(KFA-IWEB,
al.
HIP conditions. The experiments to validate
M. Rosso
UDIMET700,
prior
OF YTTRIA
using
Torino, Italy).
DISPERSOIDS
HIP
powder,
was reported
TITANIUM
of
making up the of these on
experimentally
Densification
hardness
hardfacing
temperature
Germany). HIP densiiication
NICKEL
Investigations
in the
and on the final structures
HIP DENSIFICATION OF NICKEL SUPERALLOY WITH ALUMINA AND
0. Hamed et al.
of the
Nottingham, UK). Production of
Dayton, Ohio, USA). Application of N18, a Ni superalloy, was described with regard to structure and properties. A model of the viscoplastic behaviour of the alloy at 625.675°C and strain rates of 10~‘-10~4sec~1,based on creep tests and electron microscopy was proposed. The results were used to construct equations linking material and energetic parameters.
DIBORIDE
were
electron levels of
inhomogeneities
SELF PROPAGATING
MODEL OF VISCOPLASTIC
and high
is an extra
Production,
consideration
powders
DISPERSION STRENGTHENED IRONCHROMIUM SUPERALLOY BY HIP
and design
there
Technology,
were discussed.
theoretically
applications,
and
consolidation
ogy of Lausanne, Lausanne, Switzerland). Materials with compositionally graded with
alloyed
recrystallization
investigated
reviewed
(ABA
distribution of compounds powder. The effects
(Swiss Federal Inst. of Technol-
heat treatment
High B contents The alloy without
of Technology,
Mechanically
N. Cherradi
were
Jones
characterized by optical microscopy used to show
D.
structures
on
high
PRODUCTION AND APPLICATIONS OF FUNCTIONALLY GRADED MATERIALS
properties,
to depend
but not pressure.
DENSIFICATION
gradients in
Functional
and hardness were reported HIP temperature
HIGH SPEED STEELS FROM RAPIDLY POWDERS
M. Miskovicova et al. (Slovak Academy of Sciences, Kosice, Slovakia). Investigations of structures and cutting properties of sintered M2 HSS were described. Atomized powders with additional Nb, Co and Ti and hot powder extrusion were used. The additional elements were shown to affect crystallization. As-consolidated the alloys were reported to have improved cutting properties in comparison with cast/ wrought materials and compared favourably with polycrystalline diamond tools.
MPR September
1996
39