Abstract
An experimental investigation was conducted to find out some mechanical parameter like true axial stress, effective stress, axial strain, hoop strain, Poisson’s ratio, relative density, workability, strain hardening behaviour and their relation on sintered three element sub-micron level powder metallurgy composite preforms were analysed and presented. Cold up-set forming tests were conducted in tri-axial state condition on the afore said composite preforms of iron with 0.70% manganese and three different percentage of carbon content as 0.05%, 0.10% and 0.15%. The powder was homogeneously mixed on weight basis and then gradually compacted up to 1.2 G Pa. pressure. The three preforms of 20 mm diameter and aspect ratio0.45 were sintered at 950 ± 50C. Sintered preforms were cold deformed with uniform incremental loading with step of 50 kN until the initial creak appeared on their lateral surface. The effects of different percentages of carbon on the iron based composite preforms were investigated thoroughly in the cold deformation experiment. From the experimental data, the higher initial density preform Fe-0.10%C-0.70%Mn exhibited greater values in specified formability parameters.
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