Nowadays, there is a frequent use of sintered material technologies in power and transmission systems. Sintered materials show significant advantages over classical metallurgy due to lower production costs, high material efficiency, low environmental impact and noise and vibration reduction, but also due to the high porosity of sintered materials there is a microlevel stress concentration which promotes the initiation and propagation of damage in the material. In this paper, based on the results of metallographic analyses, a numerical simulation of the deformation process in the sintered steel Astaloy Mo + 0.2C microstructure was performed for the case of monotonic tensile load and elastic behaviour of the material. Samples with 200x and 500x magnifications have been modelled. For each model, two variants of the material microstructure were analysed which include: a model consisting of ferrite and bainite grains and pores and a model consisting of a homogenised material matrix and pores. For the material matrix, homogenization of the material properties of ferrite and bainite over the volume (surface) ratios in the model was carried, while the properties of ferrite and bainite were taken from the results of microindentation (instrumented indentation method). For numerical analysis, the Abaqus software package based on the finite element method was used. After numerical analyses, comparison of homogeneous and heterogeneous case is presented. The thesis is divided into five chapters. In the first chapter, a brief introduction and description of powder metallurgy and sintering processes is given. The second chapter describes the constitutive relations of the interdependence of stress and strain. The third chapter shows the linear-elastic behaviour of the material. The fourth chapter deals with a detailed analysis of the numerical model by the finite element method with an overview of usedfinite elements. In the fifth chapter, the procedure of numerical analysis is described along with results and discussion.