Production by gas atomization and properties of nitrided stainless steel

It was noted that the stearic burnout characteristics differ for injection and compression moulded compacts and is affected

by the binder formulation.

A WATER SOLUBLE BINDER INJECTION MOULDING

ENVIRONMENTAL STAINLESS PRESENCE ADDITIVE

BEHAVIOUR

OF

An investigation of TiBz as a reinforcement for Al alloys was described.

STEEL SINTERED IN OF A COPPER BASE

A. Sharon, D. Itzhak (Ben-Gurion University of the Negev, Beer-Sheva, Israel).

FOR

D. Bialo, Z. Ludynski (Warsaw University of Technology, Warsaw, Poland). An investigation of the use of a water

It was reported that the addition of Cu, to promote transient liquid phase sintering in an austenitic steel reduced residual porosity leading to an improvement in

soluble binder in injection described. The binder

corrosion resistance. The surface were shown to be enriched in Cu.

polyethylene

oxide,

moulding was contained

polyethylene

wax

staeric acid. Results of rheological

layers

and

tests and

debinding were presented and compared with paraffin, polyethylene, carnuba wax

PRODUCTION

OF BINDER

RESIDUES

AND PROPERTIES OF NITRIDED STAINLESS STEEL

SINTERING OF INJECTION IRON COMPACTS H.C. Chen et al (National

TiOz

and

debound density

AlzO,r

had

injection

binder

been

moulded

polyethylene-Al

Densities sintering.

N gas consolidation

MOULDED

and to produce

residues,

in gas atomized powders had been eliminated. The mechanical properties and

detected Fe with

stearate

in high

binders.

corrosion

resistance

were

to austenite

wrought

stainless

Aluminium

to inhibition of during the ferrite

transformation.

alloy composites

ALUMINIUM-LITHIUM COMPOSITES M.J. Tan

EFFECT OF COPPER ADDITIONS ON CORROSION OF STAINLESS STEEL IN

A study mechanical

SULPHURIC

et

al

(Nanyang

alloys with

ACID

M.D.M. Neves et al (Inst. Pesquisas ticas e Nucleares,

Energe-

Sao Paulo, Brazil).

The effects of 2,4,8,15 or 2Owt%Cu on the corrosion resistance in sulphuric acid

of 304L stainless steel was investigated by

potentiodynamic

polarisation,

and open

potential

circuit

weight

loss

measurements.

Cu was reported to enhance corrosion resistance but an increase in critical density

for

passivation

was

also

COMPARISON

Wronski

et al (University

Bradford, UK). It was noted

that

artificial

of Bradford, hip joints

have a lifetime of 10 to 15 years due to joint

of

the

elastomer

alloys was investigated

shown that adhesion

to

three

and it was

was better to porous

surfaces. 3 16L stainless steel suffers crevice corrosion and tests on Ti-6’%&4’%;V and Co29Cr-6’%Mo were described.

MPR May 1995

of M-Fe

evaluated unreinforced CLOSED

and compared alloy.

DIE HOT PRESSED

ALUMINIUM

MATRIX

Carvalho,

particle

H. Carvalhinos

(INETI,

alloys

reinforcements

with

Technological

between strength and compromise ductility. AlaO:r was found to reduce

temperature AA8090AllLi

ductility particle

mechanical

processed

was described.

less than SIC. Decrease in SIC size had a significant effect on properties.

It PROCESSING

grain

low

boundaries,

extrusion

and high extrusion

were

AND PROPERTIES

OF

temperatures

ratios, that is, at high

strain rates

J.L. Rossi et al (Inst. Pesquisas e Nucleares,

HOT ROLLING

by

sintering and closed die hot pressing. It was reported that lOvol’%,SiC gave the best

ALUMINIUM-SILICON CARBIDE COMPOSITES MADE BY PM

by

SIC

were fabricated

that the strain rate sensitivity

high-angle

the

6061

on grain size. Fine grain sizes,

attained

The were

COMPOSITES

is dependent with

alloys

with

was reported

OF LIQUID

Energiticas

Sao Paulo, Brazil).

The production of Al- (5,lO or 15)‘%,SiC particle was described in detail. Structure

PHASE

SINTERED ALUMINIUM-SILICON CARBIDE COMPOSITES

and properties were determined. It was shown that hot extrusion of powders is a

T.N. Baker et al (University

matrix

It was

loosening. It was suggested that elastomer coatings could extend the service life.

50

IN

lGvol!%SiC particles

reported

reinforced

IN VITRO

ALLOYS

fracture

of Strathclyde,

method

for production

composite

of metal

materials.

Glasgow, Scotland).

OF THE CORROSION

BEHAVIOUROFTHREEPOROUS SINTERED

and

deformation to be correlated. properties of AL-6%Fe-SiC composites

suitable

reported.

sintered

deformation

reinforced with Sic particles was described. This allowed structural characteristics and

M.H.

University, Singapore). of the high behaviour of

I. Roman, G. Staniek (Hebrew University of Jerusalem, Jerusalem, Israel). Acoustic emission studies of

Lisbon, Portugal). A range of 6061Al

ALOY

from powder by extrusion,

Adhesion

to a cast/

steel.

A STUDY OF DEFORMATION

Stainless steel

AS.

enhanced

greater extent than found in nitrided

in a density of 92%. The enhanced

sintering was attributed grain growth particularly

current

HIP 304L

Univer-

of 95% were attained after Added TiOa and AlaOs only

resulted

atomization were used

stainless steel with up to 0.7wt%N. It was noted that the hollow particles often found

Taiwan

sity, Taipei, Taiwan). It was reported that

S.D. Ridder et al (National Inst. of Standards and Technology, Gaithersburg, USA).

ON

DEFORMATION AND FRACTURE OF ALUMINIUM-IRON-SILICON CARBIDE COMPOSITES

BY GAS ATOMIZATION

and stearic acid binders. EFFECT

TiBa was formed in situ by self propagating high temperature synthesis Al, Ti and B powders being used to prepare the alloys. Structure and properties were described. The mechanical properties were superior to those of composites formed from Al and TiBa powders. Solid state reaction gave TiAls in preference to TiBa.

with

that SIC

6061Al particles

alloy, and

fabricated from powders by liquid phase sintering and hot rolling, had near full density and good surface finish. As-sintered and

as-rolled

microstructures

were

investigated. Effects of SIC on workability and deformation behaviour were shown to be complex

depending

and volume

fraction.

on SIC particle

size

PRODUCTION OF ALUMINIUMTITANIUM DIBORIDE COMPOSITES

FABRICATION

I. Kryze et al

Gutmanas Haifa, Israel).

et

al

(Technion,

(Ecole

Centrale

Chenay-Malabry, France). A comparative study with SIC particle,

or Saffl

de

of 2124Al

Paris, alloys

of C fibres, was

reported. Analytical modelling was used to predict the gain in elastic moduli due to the reinforcements Tensile temperatures

E.Y.

AND

CHARACTERIZATION OF EXTRUDED METAL MATRIX COMPOSITES

and

damage

properties

at

were compared

T351 heat treated

specimens.

sensitivity. ambient with T4 and