Constitutive equations for metal powder forming processes

Literature.

literature Powder production

P5z

Compaction

P5z

Sintering

P52

Fundamentals

P5z

Aluminium

P53

Chromium

P53

Iron and steel

P53

Tungsten

P54

Ceramics

P54

Composite

materials

intermetallic

materials

P55

and tool steels

Mechanical

alloying

~56

Safety matters

~56

being the more suitable.

green

of Zn stearate,

on die compaction density,

powder.

P55

Metal injection moulding

K.&da, T.Machida. (Tamagawa University, Machida, Japan.) J.Japan Sot. Powder/PowderMetaJl., Vol. 47, No JO, 2000, 1051-1055. InJapanese. effect

die wall friction

O.O5wt%

amount

of density.

improved

powder

ty. The reduced

For copies of full papers you are

effective

recommended

700MPa

to contact individual

authors, use the Interlibrary

Loan

system or, for conference

papers,

to contact the conference

organizers.

at

shaped

from

tion.

Z.Lansheng et al. (Central South University of Technology, Changsha, China.) Int. J. Refract. Metals/Hard Mater., Vr,l 19, No 3, 2OOJ145.148.

,

method

packed

bed is used to absorb

from sulphurised release

the

exchange there

solution

MO

for separation

is described.

A moving

thio-molybdate

and a fluidised

and

regenerate

bed to

the

resin. 99% of the MO is removed

element

stresses

that

these

powder effective

52

was investigated.

prevent

the

at the cathode.

deposition NaNOz

additive.

MPR

March 2002

of

It is reported of spongy was the most

to be

on ejec-

materials

CO,

were

steel tooling

R.M.Germnn et al. (Pennsyluanin State University, USA.) Materials and Desqn, Vol 21, No 4, 2000, 409. 415. The

need

to reduce

lead times

is discussed.

processing

properties

of metals designed

potential.

that

times by use

and/or

for the

laser

re-heating

was

beams and a

and cooling.

Direct metal laser sintering tool making

for rapid

J.Y.H.Fuh et al. (National Uniuersity of Singapore, Singapore.) J .Marer. Process. Tech&. , Vol 1 J 1, No J -3, 2001, 269-272. Direct

laser metal

of tools and parts,

sintering,

for production

is reviewed.

parts and tools depend

on material

variables.

accuracy,

tion,

Powders

or multiphase.

Dimensional

mechanical

properties

used

Properties

of

and process surface condi-

and structures

are

analysed.

Fundamentals Computational approach to granular segregation in tumbling blenders F.J.Murzio et al. (Rutgers University, Pwmway, USA.) Powder Technology, Vol J 16, No 2-3. 2001, 224-23 I. automata

simulations

in tumbling

simulations

are

experimental

blenders shown

to

agree

data. It is suggested

tive understanding

of granular

are described.

by use of simple

The with

that a predic-

of segregation

may be possible

well

mechanisms algorithms.

Constitutive equations for metal powder forming processes

ceramics

application.

and to have cost

Methods

two

for produc-

It is reported

in short

are

the latter

A Ni alloy powder

cracking

laser for controlled

Cellular

Time compression-rapid

shape

were used, a YAG laser for initial melting

mixing

reduction

and Na

than

two

Uses are said to be widespread

of

To minimise

melting

into cup

stress is shown

in the

tools had been produced

production

is used to study formed

on compaction

states

and

,

powders

above

using a combined

Residual

tion of tooling

Z.Y.Wang et al. (Research Inst. for Non-Ferrous Metals, Beijmg, China.) PM Industry, Vol. 11,No I, 2OOJ273 I. In Chinese.

Cu,O

procedure

components

tools are reviewed

on electrolytic

pressures

in 2 materials

model.

Stress

of PM

Effects of additives in production cuprous oxide by electrolysis

and nitrite

densi-

was most

similar.

with

nitrate

of lubricant

ion-

is a loss of 0.65%W.

The effects of Na and K dichromates

flow and lubricant

but not green

amount

more dependent

solutions

A new ion-exchange

friction

added

compaction

powder

material

of MO from W solutions

for powder The

in

to be

J?Redmr. (Technical Unwersity of Denmark, Lyngby, Denmark.) Jnt. J. Solids/Structures, Vol. 38, No 5, 2001, 759-775.

Powder production of molybdenum

is shown

and linear

can be prealloyed

A finite

Separation

Fe

balling

in was

for

Stresses in powder components during and after ejection

residual

tungstate

with

used.

powders,

solidification,

Two types of solidified

identified,

and friction

Zn stearate

the most suitable uniformity

admixed

was investigated

of metal and

investigated.

The

P55

laser melting

zones of melting

Behaviour of lubricant in compaction of iron powders with die lubrication

powder,

P55

materials

Selective small

P54

Electrical and magnetic Hard materials

Compaction

of producing

L.Anand et al. (Massachusetts Inst. of Technology, Cambridge, USA.) Jnt. J. Plasticity, Vol 17, No 2, 2001, 147-209. A new model

and described.

for compaction

ders, based on a combination consolidation

Sintering

model

Material

for Fe powder. procedure shape.

Predictive

is described.

by a finite

parameters

The

model

were validated

sion of a cylinder

F.Abe et al. (Osaka Unioermy, Osaka, Japan.) J.Mater. Process. Tech&., Vol 111, No J-3, 2001, 210-213.

0026.0657/01/$

is implemented

gramme.

Manufacture of hard tools from metal powders by selective laser sintering

mechanisms,

of metal

element

and The fire-

were determined and computational

by uniaxial

and by formation and

pow-

of distortion

experimental

compresof a conical data

are

compared.

- see front matter 0 2002 Elsevier Science Ltd. All rights reserved.