Deformation of material means a change of the material in shape and dimensions under the impact of forces, which is divided into plastic and elastic deformation. The main difference between plastic and elastic deformation is in the form of the material formed after the removal of applied force. Elastic deformation implies the return of the material to its initial shape after the removal of initially applied force, whereas plastic deformation causes a permanent change in shape resulting in the material taking on a new shape. One of the many processes aiming at achieving plastic deformation and therefore achieving a shape of a usable product is the forging process. Forging is divided into two basic principles: free forging and die forging. The process is performed on forging machines divided into hammers and presses. The primary task of these machines is to apply force to the workpiece and thus deform it plastically into the desired shape. In the process of die forging, the flow of material is limited by the engraving of the die. Filling the engraving is an important parameter, considering that various errors and problems in the forging can occur as a result of poor filling. To prevent this, software for simulating the flow of materials has been developed. Based on the division of the material into their finite elements, the software analyzes each individual volume element and, after the finished process, provides a visualization of the material flow and the distribution of stresses. In this paper, Marc Mentat software with the applied materials 15Cr3, C15, and Al99.8 was used. Simulations of material flow and stress distribution in conditions with and without friction are shown.