Modeling and simulation of the viscoplastic behavior of metallic powders during solid state sintering

摘要

Experiments and numerical modeling of the sintering stage in metal injection molding are presented. The modeling uses the volume fraction of metallic powder as major initial data. As 20% of size shrinkage may be reached, a large strain formulation is employed. A non linear viscous law allows to determine the density and shape evolution under a prescribed temperature variation. This modeling takes into account both surface and volume diffusion phenomena. The results get from numerical modeling are compared with experiments the agreement is very good.