Plastic deformation of porous metal with an initial inhomogeneous density distribution

Abstract

The deformation behavior during axisymmetric upsetting of sintered metals has been simulated using the finite-element method. In the powder forging process, the initial density distribution is not homogeneous. For the accurate analysis of the compression test, as well as of the powder-forging process, the effects of the initial density distribution and die friction on the density distribution during deformation have been studied. Under low-friction conditions, the initial density distribution affects the deformation geometry, the strain distribution and the density distribution, but under high-friction conditions, the effect of the initial density distribution was found to be negligible. The initial density distribution did not affect the punch force or the average density, regardless of the friction conditions.