processes was discussed with regard to part quality, process economics and production of complex shaped parts. It was considered that the use of HIP, or otherwise, depended on control of ‘net’ or ‘near-net’ shape. The value of modelling and simulation of HIP was emphasized and the application of models was outlined. Some examples were given and discussed.
dropped to 25% in the pole direction and 14% in the pole boundary direction after debinding and sintering. Magnetic properties were described. POWDER METALLURGY IN ELECTROMAGNETIC APPLICATIONS
An investigation of dimensional changes during sintering of injection moulded parts was described. Use was made of timeindexed image acquisition and analysis which enabled estimation of part density as functions of time and temperature and in situ measurement of time to attain full
C.G. Oliver, H.G. Hutz. (Hoeganaes Riverton, New Jersey, USA).
density. Microscopic images of part surface were also obtained. It was attempted to correlate these with sintering environment.
Characterization of powders
The role technological
POWDERS FOR INJECTION
K.M. German et al. (Pennsylvania State University, Pennsylvania, USA). The application of injection moulding to production of near-net shaped complex parts was discussed with reference to the enhanced
discussed. MICROSTRUCTURE WATER ATOMIZED
OFGASAND STAINLESS STEEL
POWDERS J. Wang et al. (Chalmers Technology, Sweden.) The morphologies
of gas and water atomized 405, ferritic, and 1242 and 2390, martensitic, stainless steels were invest.igated size. The
of PM, particularly recent advances, in the production materials was discussed.
Mechanical properties of high alloy steels MECHANICAL PROPERTIES STAINLESS STEELS H.1. Sanderow, Technologies
reference to distribution
composition, density and conditions on the mechanical
of 300 and 400 series stainless
For a 300 series steel an increase
in density from 6.5-6.9 gm.cm-” gave a small increase in strength and large increases in ductility and impact strength. MIXED
N.C. Trilk et al. (Powdrex
the effects of size, and agglomeration,
out. Models were constructed for size geometries to represent
The computer combined with
maps. A GENERALIZED
FURNACE ATMOSPHERE ITS VERIFICATION
T. Philips et al. (BOC Gases, Murray Hill, New Jersey, USA). Studies of sintering furnace atmosphere profiles and the effects of changes in the location of gas injection points, flow rates
IN WEAR ROLLING
S.G. Dubois, R.M. German. (Pennsylvania State University, Pennsylvania, USA) Simulation of solid state sintering, with
SIMULATION FOR SINTERING REAL POWDERS
regard to the use of computational
Kent, UK). The addition of tool steel powders to low
and the larger were equiaxed with surface dendritic patterns. 6 ferrite was found in
alloy steels, giving a low cost improvement
the smallest particles.
Powder blends for wear, rolling contact fatigue, a sinter hardening alloy and general
determine atmosphere profiles, which were verified experimentally. Applicability of the
model was discussed.
either spheroidal particles
or in droplet
ANALYSIS OF GAS ATOMIZED COPPER
State University, Pennsylvania, USA). The development, alloys for electronics reported.
of metastable applications
Cu was the
of the alloys was described.
The objective was to develop powders with optimum properties for electronics applications.
J.W. Simmons, J.S. Dunning. (US Bureau of Mines, Albany, Oregon, USA) The effects of N as an aloying element in stainless discussed
steels were described and with regard to solid solubility,
stabilization and corrosion resistance. High nitrogen stainless steels were
PRODUCTION OF POLE ANISOTROPIC STRONTIUM FERRITES BY INJECTION MOULDING IN MAGNETIC FIELD T.S. Cho et al. (Korea Inst. of Science and Seoul, Korea).
strength and similar ductility than 300 series stainless steels. Processing, structure and properties were described.
ModeMing of sin tering
It was reported that pole oriented Sr ferrite rings, for use in DC motors, had been
by MIM. 1 urn anisotropic
D.W. Yoel et al. (Centorr/Vacuum tries Inc, Nashau, New Hampshire,
where mass and
are used to
MECHANICAL PROPERTIES OF NITRIDED INJECTION MOULDED IRON J. Rawers, F. Croydon
(US Bureau of Mines,
USA) Effects of processing 316L
atmosphere in structure 0.15wtX
For N up to
detected. Samples tensile properties
processed in Ar had below those of cast
alloys but for those treated in N the properties were similar to cast materials. PRODUCTION
IN SITU TECHNIQUES
in the pole direction
USING IniIAGING AND
binder, injection moulded in a magnetic field. The particle alignment was about 85X after moulding.
Metal injection moulding
HIGH STRENGTH STAINLESS STEELS THROUGH ALLOYING WITH NITROGEN
Lossburg, Germany). IndusUSA).
It was reported that MIM had been used to manufacture Fe-2!%Ni steel gears for use