En este trabajo se estudia la influencia de la microestructura de un acero AISI 1045 templado, conteniendo como principal microconstituyente Bainita, en el comportamiento de los esfuerzos longitudinales (S_xx, S_yy) m?ximos principales, Esfuerzo de Von Mises, deformaci?n pl?stica y deformaci?n equivalente. El modelamiento computacional en 2D, representa las condiciones reales existentes en un ensayo de nano rayado de forma experimental. La creaci?n del mallado en funci?n de la microestructura se realiz? en el software OOF2, y posteriormente se crearon las partes restantes que conforman el sistema, mediante el software de elementos finitos ABAQUS. El modelo considera un indentador, propiedades elasto plasticas dentro de los microconstituyentes, variaci?n de cargas y coeficientes de fricci?n. Los resultados muestran concentradores de esfuerzos en las fronteras de los granos de Bainita superior y Martensita, present?ndose fallas por fluencia en el material sobre ciertas regiones del rayado, mayores deformaciones, y esfuerzos normales m?s significativos en comparaci?n a los cortantes y al sustrato ideal.This paper studies the influence of the microstructure of a tempered AISI 1045 steel, containing Bainite as the main microconstituent, in the behavior of the stresses (S_xx, S_yy), Von Mises stress, plastic strain and equivalent strain. The Computational modeling 2D, represents the conditions in an experimental nano-scratch test way. The creation of the mesh in function of the microstructure is done in the OOF2 software, and then the remaining parts that make up the system, by the finite element ABAQUS software. The model consider indenter, elasto-plastic propThis paper studies the influence of the microstructure of a tempered AISI 1045 steel, containing Bainite as the main microconstituent, in the behavior of the stresses (S_xx, S_yy), Von Mises stress, plastic strain and equivalent strain. The Computational modeling 2D, represents the conditions in an experimental nano-scratch test way. The creation of the mesh in function of the microstructure is done in the OOF2 software, and then the remaining parts that make up the system, by the finite element ABAQUS software. The model consider indenter, elasto-plastic properties within the microconstituents, and the load variations and friction coefficients. The results show concentrators of stresses on the grains border of Upper Bainite and Martensite, presenting yield failure on the material over some scratch regions, higher strains, and normal stress more significant in comparation to shear stress and the ideal substrate.erties within the microconstituents, and the load variations and friction coefficients. The results show concentrators of stresses on the grains border of Upper Bainite and Martensite, presenting yield failure on the material over some scratch regions, higher strains, and normal stress more significant in comparation to shear stress and the ideal substrate.