Abstract
The impact of a high-speed punch on metal powder has been shown to result, under optimized conditions, in interparticle melting and welding. A strong compact is thus obtained which requires no subsequent thermal treatment. The technique can produce parts from non-equilibrium powders or powder mixtures. However, even with standard powder, such as stainless steel, the technique imparts unique properties to the resultant part. For instance, the macrohardness (420 HV) indicates an exceptionally high degree of work-hardening and that the interparticle melted zones are rapidly quenched. Annealing the compacts for 1 hour at temperatures up to 900° C does not result in a significant change in the yield stress.
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