Effect of carbon content on workability of powder metallurgy steels

Workability behaviour of steel powder metallurgy performs containing 0%, 0.4% and 0.8% of carbon were completely investigated experimentally. Cold upsetting of abovementioned powder metallurgy sintered steels preforms with two different aspect ratios namely 0.39 and 0.59 was carried out with graphite as lubricant and the formability behaviour of the preforms under triaxial stress state condition was determined. The formability stress parameter was evaluated for all the above said preforms and its variation with respect to axial strain was plotted, studied and discussed relative to their as sintered microstructures. Also the characteristics of various stress ratio parameters with respect to axial strain were analyzed and presented.