Abstract
The effect of addition of master alloy powders containing B on the densification, microstructure and mechanical properties of atomized iron powder compacts has been studied.The results are summarized as follows.(1) The Ni-B master alloys activated the sintering process through the formation of eutectic liquid. However, there was limitation to sintered density that was attained by those alloys.(2) Densities of the order 99% theoretical were readily achieved with addition of the Fe- Ni-B master alloy powders. Volume fraction of liquid phase was increased during the sintering process by addition of these additives.(3) Rapid densification occured at 1403 K in iron powder compacts from 16 μm and at 1423 K from 80 μm, but in compacts from 45 μm having large pore size distribution occurred above 1433 K.(4) Sintered strength increased with the amount of master alloy powders. With 5% additive, the tensile strength of 400 MPa was obtained. Maximum elongation of 30% occurred at 2% addition.(5) Elongation was closely related to the forming process of the eutectic phase and decreased as it became continuous since a fracture occurred along the eutectic structure.
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