Formation of micropores in tungsten carbide grains in cemented carbides

Formation of micropores in tungsten carbide grains in cemented carbides

Technology, Nagdoka. Japan). J. Japan Inst. Metals, Vol 59, No 9. 1995, 984-989. (In .Japanesr.) Properties of S&N, were discussed with respect to cov...

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Technology, Nagdoka. Japan). J. Japan Inst. Metals, Vol 59, No 9. 1995, 984-989. (In .Japanesr.) Properties of S&N, were discussed with respect to covalent honding, sintering, which

requires

a liqu,Nd phase

and

the

presence of Si& on the Si:,N, surface. A study in which :3mol% of each of AlzO:I and YzO:s were

added

described. as

The

1.07

to

9.2wt’b

treatment. phases

as

sintering

SiOz content according

Grain

to

boundary

were found

aids

between

4.68%.

toughness

The

and

powder

2.68

found

A study described.

SINTERING

mechanical

recycled

carburization.

The

comply

a

with

FORMATION CEMENTED

OF HIGH

to lamellar

Relationship

between

alloy

was

-Japanese

re-

said

to

standard

of Tl high speed

increase

from

enhances

in

‘:,(’

sintering

t,emperaturt sintering

and

from

1320

window

it is reported 0.8

to

reduces to

1.4%

required

1240°C

opening

from

formed

1.4%Cr

which

a Fe-(Jr

reference

to optimum

nol.,

Vol

Hunan,

13, No

Electron

microscopy

described.

The

blue W oxide improve

properties.

is to

The use of

is reported

of micropores

to

and to

PROPERTIES

WITH COMPRESSIBLE

with

USE OF FLUIDIZED

BED IN

REDUCTION AND CARBURIZATION TUNGSTEN CARBIDE-COBALT

STEELS

OF

ham, Nottingham,

of Notting-

IJK), Pouder

China).

Metall., \‘ol

and

Effects properties

hardmetal

of C and Ni or: the mechanical of high speed steel, diluted with

steel,

powder, ptn-e Fe or a low alloy

were investigated

with the intent of

optimizing

properties

Ihr wear resistance.

Mechanical

properties

and %Ni in retained

austenite low

are shown to depend

alloy

steel

was

the

RESIDUAL

STRESSES

suitable

IN TUNGSTEN

was shown

were attained

National

Chonju, Korea). J. Korean 33, No 5, 1995, 599-604.

on sintering

that

University.

Inst. Metals, Vol English.)

(In

neutron

Tsukuba,

Japan).

Metals,

Vol 59, No 7. 1995, is

reported

sintering

alloys

compacts

with

binder

Hardness

at

increasing

sintering

increased

inversely

with

Stress set-up temperatures

temperature.

were 8OO”C,for

the low Ni alloy, and 717 C.

Inst. for

J. Japavl

coalescence

are

of

developed

particle

and

ductile

during

equations

deforntation

and

species

optional

other

being

for Two

Ones deals with a

with

The

during

criteria

coalescence.

are considered. species

MA,

predicting

specifying

fracture

programs

powders

from

of particle

impact

programs, fragmentation

addtad

deals

with

welded

to

two

form

a

third. APPLICATION

OF COMPUTATIONAL

PROGRAMS

TO MODELLING

MECHANICAL

D. Maurice, T.H. Courtney nological

University,

1JSA). Metall.

OF

ALLOYING (Michigan

Houghton,

Tech-

Michigan,

7kan.s. A, Vol 26A, No

Mater. of

modelling

in an earlier

experimental

754-760.

(In

structure

have

Ti-48at%Al been

containing

made TiHz

by HIP. Densification

HIP was investigated.

oxidation

that

It is reported

by and

during that the

of the HIP alloy increased with of the as-sintered specimens. 25

C

increased temperature

resistance and was enhanced

depended by HIP.

programs,

paper,

are used in

predicted

data and agreement

of

2

is is

report.ed.

The

study

thus effects

to

uncertainty

of

input

material

on program

predictions.

and

within a other of

properties

Inst.

Japanrsc.)

tensile

Stresses

and

Application

Research

Metals,

to

and

modelling deformation

factor

compressive

matrix

Computer

application

It

Tech-

Michigan,

Trans. A, Vol 26A, No

incorporating

described

ALUMINIDE

density density

to

(Michigan

Houghton,

USA). Metal/. Mater.

HIP TITANIUM

intermetallic

diffraction

FOR

two ways. One is to compare

subject

content

at 1280 C for

OF COMPITTATIONAL

Ilniversity,

HIGH TEMPERATURE HARDNESS AND OXIDATION RESISTANCE OF SINTER-

range -173 to 627 (:. WC.’ W% stresses.

for

Intermetallic materials

TiAlz3 followed

the

Al(‘0,

9, 1995, 2437-2444.

was used to determine thermal residual stresses in WC-(6 or 25)wt%Ni over the and

powders

1 hour.

H. Suga et al. (National

COMPOSITES

(Chomnbuk

It is reported

of WC-Co

production. Mean particle size to be O.lZ/cm. Densities of 99.7%

OF THERMAL

CARBIDE-NICKEL K. Seol

carburization

on ‘kc. The

more

addition. DETERMINATION

Vol 13,

PM Technol., (In Chinese.)

It is reported that fluidized bed technology has been used in the reduction

38, i%o 3, 1995, 230-231’.

compressible

of

for

9, 1995, 2431-2435.

single

ofTechnol-

W. Zhu et al. (Wuhan Ilniversity ogy, Wuhan,

POWDERS

(University

invcstlgatrd

ALLOYING

dispersoids.

No 3. 1995, 202-205. G.L. Zhou, J.V. Wood

spacing

temperature

D. Maurice, T.H. Courtney

an

ON

OF HIGH SPEED

formed.

PROGRAMS

MECHANICAL

the extent

is

processing.

MODELLING

nological

micropore

are related

as precursor

forms

(In

of WC-Co

of the WC powder.

the incidence

are discussed

of

micropores

PM Tech-

181-185.

in the WC grains

the histov

of Technol-

China).

formation

decrease

sintering.

OF ALLOY ELEMENTS

structures

interlamellar

ignition was

is discusstd

Mechanical alloying

IN

POWDERS EFFECT

synthesis

DEVELOPMENT

:3, 1995,

to

skeleton

result in impaired

Sintering and structures

the 10

40 ‘C. At less than 0.8%<’ a eutectic above

and

intermetallics

IN

GRAINS

South lrniversity

Chinese.)

that

(In

compounds

alloying

with respect

required

CARBIDES

3, 1995, 221-229. and

of intermetallic,

mechanical

that the hardmetal

OF MICROPORES

ogy, Changsha,

was investigated

Formation during

but

CARBIDE

c’.S. Wright rt tcf. (C‘r+.ersity of Bradford, Bradford, ITK) Pon1de-r M&all., Vol 38, No Effect of C on sintering

Vol 41, No 8, 1994, 949-952.

Metall.,

Japanese.)

of

STEELS

steel

K Ishihara et (~1. (Kyoto University. Kyoto,
AlNi and NiTi.

Z. Li ((Ientral

and

properties

from grinding residues, is

It is shown

be

TUNGSTEN SPEED

Ilniversity,

were

5.4 MN.m ” ’ and 980 MPa respectively. SUPERSOLIDUS

rt al. (lwate

of

OF INTERMETALLIC BY MECHANICAL

ALLOYING

specification.

fracture

strength

M. Nakamurd

FORMATION COMPOUNDS

OF FROM

Morioka, Japan). .I. Jupun Sot. Powder Pou~dcrr Metall., Vol4 1, No 8, 1994, 980-984. (In Japanese.)

could

1.07 and 2.6%

maximum

bend

PROPERTIES

BARDMETALS RECYCLED GRINDING WASTE

WC-Co, recovered

crystalline

and above 6.39”~SiO~ hrlt not between and

is

is estimated

MECHANICAL

with

Metal and powder injection moulding NUMERICAL ANALYSIS PARTICLE

SIMULATION

AND

OF EXTRUSION OF FILLED PLASTIC

MATERIALS S.J. Kim, T.H. Kwon

and

Science

and

on

Powder

Technol.,

(Pohang

Technology,

[Jniversity

Pohang,

of

Korea).

Vol 85, Iio 3, 1995, 227-

239.

MPR June 1996

49