Thermodynamics of hot isostatically pressed graded structures in stainless steels

that the Cu strip contained

Pou~d~rMetall., Vol41, No 8. 1994, 933-938. (III Japanese.) Al- lO%Mg-O.X’bZr alloys were prepared

which

atomized

powder.

by rotating

inclusion

interfaces,

disc atomization

and extrusion.

is higher

than

Strength and elongation

were 540 MPa and

investigated

%8”,,, comparable

Al7075

Coarse inclusions,

with

alloy

heat

treated to T6 condition. Superplasticity was found in the alloy at 40’~) to 480 C and an optimum

strain

rate of 42x10

185% elongation

‘se<’ ’ gave

at 480’ (~I. ALLOYWG

et (11.(Hanyang Iyniversity, Seoul, Korea). J. Koretrn Inst. M&As, Vol 33, No 6. (In Kowtn.)

Mechanic-al stability

of

Al-8% (Ti,(‘e), of

investigated. after

and

Ti

Steady

and

synthesis

were

stability.

states

wpre

found

(‘c

precipitattb

and

interfacial

1’. Marookd

c’

is

properties.

sintering.

MICROSTRUCTURE

FOR M. Selecka Vyskumu

(Norddcutsche Germany).

11, 1995, 7:32-736.

Affineritl

AG,

Vol 49.

Metall..

No

COPPER-

preparation

c.osts

alloys,

WITH ALUMINA

V. Katana

et

OF DISPERSOID ALLOYED

TEMPERATURE

COPPER

reacted

and Mn. Boridrd

and nitridecl

(~1. (list,av

by phase

with

strengthening saturat,ion

agents.

POWDER

and was longer

with

e x t r IIs i o n

iron

with

material

is

No

I/2,

rrport.ed

to to

for

with TiR,

properties

1.h a n o t h c r (:u alloys.

after hot

d i s 1~e r s i o n

and steel

strengthened method, is

structure. have

The

electrical

AB, Hiigangis, Swtaden).

of ferrous

PM materials

regard

to requirements

discussed

with

end-users.

It is reported

warm compaction it possible

greater dimensional

of

that alloy selection,

or shrink sintering

to attain

are

higher

make

densities

and

stability.

applications. THERMODYNAMICS OPTIMIZATION DENSIFICATION PM COPPER

ISOSTATICALLY

OF POSTCOLSD ROLLING

OF

STRUCTURES

IN STAINLESS (Technical

K.K. Dube rt ul. (Indian Inst. of Technology,

Graz, Graz, Austria).

Kanpur, India).

86, No 12, 1995, 864-869.

Pcwdw

Metall.,

Vol 38, No

4, 1995, 277-283. Production Cu20

powder

The

paper

STEELS

of fully dense Cu strip from

,joining

is dcscr bed. It is reported

compositionally

dissimilar

University

2. Metallkunde,

discussed metals graded

rt cl/. Pwoshkowyrr

Mrtullur-

(In Kussian.)

A study of the struct\trr alld properties

experimental tensile

design.

st,rengths

elongat,ions hardness

of

After heat treatment

of

of

Anisotropy

6

54

2000

to to

ttr 2150

8%

and

56C

Ml’s,

Rockwcsll

were

and higher strength

in the longitudinal

attained. was foulId

direction.

EFFECTSOFCARBON CHARACTERISTICS

ON STRUCTURE

AND PROPERTIES PM STEELS

OF HOT DEFORMED

No

f’( cxl. Poroshkinmycr 11’ 12. 1994, 88 93.

Mettrl(In Kus-

Sian.) influencing

properties

of

investigated. graphite

as C sources respect

structure

and

st.eels

wfarc

sinterfbd

It is reported

that

synthetic

and lamp black are more effective than

acicular

t,o mechanical

graphite

properties

with of

the

steel.

PROPERTIES NICKEL

rl al.

POWDER

GRADED

STRIP R. Prader

AND

Nickel

OF HOT

PRESSED

(‘I

arcs

of extruded martensiticx PM steels is described. I!se was madtb of statistical

Factors

Scund. J. Mrttsll., Vol 24, 1995, 147-151.

phases

of the matrix.

AGEING

G.Y. Dorofeev

PM STEELS

with MO. Ni.

giya, No 11: 12. 1994, 85-88.

lurgiyrr,

Properties

with CuC) and AlzOr,

regard

time

‘:, dispersoid

for TiR2. Alloys

had higher mechanic.al

0. Mars (Hiiganls

)

by a mechano-fzhemical

analyzed

had been 17 hours

Materialoveho

Me~tcLlurgir.

mixture

(In Korean.)

Milling

increased

MARTENSITIC STEELS B.F. Badeyan

1 to 5”<, A120:+ and TiI& as dispersion

strengthened

(‘zechoslovdkia)

of dispersion

IN

rt trt. (hewoo Heavy Industries J. Kowtrlt Inst. Mrlc16.

HIGH PERFORMANCE

Cu powder

steels wc’rc It is reported i hat during for 1 hour at 1200 C in h’, H

from the eutectic

HIGH

It is reported that, c‘u powder mechanic~ally alloyed for up to

I he matrix

sonic’

is

ALLOY

1’01 :X3. No 5, 1995. 605-612.

mechanical

MATERIAL

Preparation

H on

of

is

there

Ltd, Ko,jr. Korea)

Ynst. of Technol-

COPPER

(In Czech.

of

analyzed. sin&ring

and processing.

MECHANICALLY

T.K. Kuon

POWDER

NANOCRYSTALLINE

Pruskow

effects

microstructures

STRUCTURE EVOLUTION PROPERTIESOFEXTRUDED

hence

of where

1 2.

No

(III ~‘zcch.)

production,

OF

199.5, 70-76

1995, 77-96.

shown to cause hardening

MICROSTRUCTURE

Pokroky

Czechoslovakia)

consultation between powder producers and processors in respect of powder

A Cu rich

Kosice,

Kosice.

Prcxskoc~r MrVulurqic,

of

(:u-O.‘iwt?,Cr

SAV.

Pokroky Thtl

(In German.)

rt al. (Ilsta\. Matcrialoveho SAV,

mis-

was found in grain boundaries.

Vyskumu

OF SELECTED

the

.I. u’apc~~~ Sot. Powder

is drscribcd.

EFFECTOFBORONONTHE

parameters

including

was

strip

Minimization

Powder Metc~11.. Vol 41. No 8, 1994, lO%:j1026. (In .Japanesc.) Production. alloying, of

the

did not. vaqv

by ttxpclriment

to be possible

FROM

f,t al. (Musashi

and verified

considered

ALLOYED

ogy, Tokyo, *Japan)

modified

developed.

properties.

OF SINTERED

a to

in a linear manner across the joint. A model to describe diffusion and relatc>d structural

enhanced

Copper

MECHANICALLY

and properties

and

and

from Due

interactions

microstructure

were hot

increased

by HIP. The made

blends.

inhibited

matrix

MADE

was

powder

thermodynamic

evolution

560

COPPER AND COPPER ALLOYS POWDER METALLURGY

CHARACTERISTICS

CHROMIUM

alloys and 316L

formed

gradient

of

of 20

energy.

STRUCTURE

range

oxide

powder at

composition

were

Ce

Powders

lattice

for

two ferritic

steel

Applicat.ions of Cu and Cu alloy powder materials arc> discussed with rcf+rence to process costs in at,tainment of specified

treated.

between

varying

C'r.

of Ti aluminides

thermal mat.ch

heat

safe

atomized

to give optimum

Hamburg,

atrd

16 hours attrition.

pressed

thermal

wit.h

that limits are

Annealing

E. Pcisskrr

alloying

proportions

and

at 20%

ones did not up to

joints between stainless

STEELS

.J.T. Lim

1995, 7.57-765.

and decohesion

60”~, reductions

reported

THERMAL STABILITY OF ALUMINIUMTITANIUM-CERIUM ALLOYS

of ‘% reduction.

60%. It is recommended

respectively.

AND

at matrix/

over lOpm, were found to

but smaller

reduced MECHANICAL

from

during cold rolling, was

suffer fragmentation

and

made

&cohesion

as a function

reduction

0.5v01%Cu20.

in strip

of

V.D. Zozula

concept

of

means

of

by joints.

TEMPERATURE

MADE

BY HIGH

SYNTHESIS

Vol

(In German.) the

OF TRIBOTECHNICAL

BASE ALLOYS

Graded

rt ~1. Poroshkoutcya

giyu, No 11,‘12, 1994, 94-97. Studies temperature

of

self

MetcLllur-

(In Russian.)

propagating

synthesis

of

high Ni

has<,

MPR June 1996

47