Modelling And Simulation of Stainless-Steel Powder during Compaction Process

A coupled mechanical and thermal analysis of powder during the warm compaction process has been investigated. This paper presents the development of the numerical model to generate a green compact through uniaxial die compaction using the finite element analysis software LS-Dyna. The objective of this simulation is to study the stress and the pressure apply on Stainless-Steel 316L metal powder during compaction. The results show that increasing the compaction force within a certain range can increase the density of the bulk pellets, and that the lubrication conditions need to be improved to further increase the relative density. Numerical simulations are used to obtain the maximum compaction forces for different materials and to provide guidance for improving and optimizing the process parameters in practical production. As a result, the powder deforms without break and show Stainless-Steel 316L is ductile material since it can sustain until 169MPa in Von Mises stress. However, the pressure is increase simultaneously with time which is it can reach until 7.66GPa and the value is higher than tensile strength of Stainless steel 316L. The analysis of particle stress reveals that during the compaction process, stress concentrates occur on the Stainless steel 316L particles. The Stainless steel 316L particles fill the pores in the compacted billet through plastic deformation, leading to stress concentration on the harder Stainless steel 316L particles.