LARGE SCALE PRODUCTION OF STAINLESS STEEL GEARS BY METAL
consolidated powders in order to attain the full potential properties of the alloys. A
study of Mg- (15 or 20) at%& (1 or 3) at%Zn was described. Optimum thermal treatment conditions were established.
M. Enders et al (Schunk Sintermetalltechnik GmbH, Giessen, Germany). The mass production of small, 0.3 and 1 gm, gears in 316L stainless steel was described. The parts were reported to be ready for assembly in an electric toothbrush without any secondary operation. The quality system was outlined.
MECHANICAL PROPERTIES OF MAGNESIUM ALLOY MATRIX PARTICLE REINFORCED
K.V. Kainer et al (Zentrum fir Funktionswerkstoffe GmbH, Clausthal-Zellerfeld, Germany).
A study of a Mg alloy, QE22, reinforced with Sic particles was described.
THERMAL STABILITY OF RAPIDLY SOLIDIFIED ALUMINIUM-
between Al and transition metals was discussed, powders were prepared by rapid solidification to extend the range of solid solubility and to increase the extent of dispersoid thermal
AlizMo and the alloys.
powder by vacuum hot pressing, extrusion and rolling. Microstructural evolution during processing
regions and heterogeneous
in the deformed
it was suggested that nucleation and growth are
favoured by deformation. PRODUCTION
of Sic particle
J.H. Ahn, H. Chung (Korea Inst of Machinery and Metals, Changwon, Korea). Mechanical
consolidation powders were MA
of Ti-Al-(Mn, Cr or V) investigated. Blended and were
powders were reported to have a good combination of strength and ductility
GmbH, Erlensee, Germany) A novel atomization method, applied to a BTi
It was reported that Mg-Ca and Mg-Cahigh
characteristics were determined. Powders were consolidated by hot extrusion at 200 to
before and after were described. HEAT
in Be materials
surfaces degassing. described
of Burgandy, arising
in which each process stage was
for its effect on final porosity.
consolidation. Residual porosity could be correlated with models of dynamics of gas bubble formation
It was shown that PM methods could be used
wrought alloys. Inert gas atomized, rapidly solidified, powders were used. The improvements attributed to
in properties were elimination of segregation
and optimization of Examples were given.
FAILURE BEHAVIOUR OF SINTERED STEEL
URA du CRNS,
The influence of size and shape of pores static and dynamic properties of
sintered steel was discussed with reference to methods of control reported that addition spheroidization
of pores. It was of P results in
A NEW GRADE OF SYNTHETIC GRAPHITE
FOR PM APPLICATION
K.D. Streb Switzerland)
Problems in the supply of graphite were discussed. It was reported that a new grade of synthetic
had been developed
for PM use. The graphite powder was shown to have a fine particle size and a narrow size distribution
OF BORON ON
LAYERS ON SINTERED
S.Sto1ar-z et al (Inst. of Non-Ferrous Crakow, Poland).
The effect of B on the ion-nitriding G. Michot et al (Ecole Nancy, France). Rapid solidification
des Mines de nancy,
OF STEEL SCRAP FROM
and the need to use heat treatment
of Mg alloy powders
was discussed with reference
Fe powders found
reported G. Poli
low ash content.
C. Verdu et al (GEMPPM Villeurbanne,
process conditions and heat treatment were discussed. Possible
T. Bracconi et al (University Dijon, France).
shown to reduce strength and ductility.
K.V. Kainer et al (Zentrum fur Funktionswerkstoffe GmbH, Clausthal-Zellerfeld, Germany). had
0. Grinder, P. Billgren (Soderfors AB, Siiderfors, Sweden).
was reported that the consolidated materials had good properties. Effects of
PHYSICO-CHEMICAL PROCESSES IN THE PM PROCESSING OF BERYLIUM
PROCESSING TO MAKE HIGH PERFORMANCE ALLOYS
MAGNESIUM AND MAGNESIUM ALLOYS BY POWDER METALLURGY
USE OF RAPID SOLIDIFICATION
powders were shown to be spherical with few satellites and a mean size of 80 pm. It
predictions of structures and properties possible when used as an addition to Fe based cermets. The predictions were confirmed experimentally. Comparison was made with conventional sintered alloys.
MECHANICAL ALLOYING OF TERNARY TITANIUM-ALUMINIUM ALLOYS
Manchester, Manchester, UK) Specimens of A1-8.5wt%Fe-l.2%Si-1.5”%V were
MICROSTRUCTURAL DEVELOPMENT DURING CONSOLIDATION OF
structure and properties
M.C.S. de Macedo, G Michot Mines de Nancy, France), Formation
Sic powders. The influence
Use of carburized
during spark machining of steel in a hydrocarbon was described. The powder characteristics were shown to make
was investigated. BN and Fe,N.
content was shown to be beneficial.