Influence of Thermal and Thermomechanical Treatment on the Mechanical Properties of the Fe-C-Si-Mn-Cr-Ni-Mo System Armor Grade Steel

The article focuses on studying the challenges associated with improving the strength properties of the Fe-C-Si-Mn-Cr-Ni-Mo system steel alloy and analyzing the effects of various heat treatment and plastic deformation methods on the mechanical characteristics of the cast alloy.The steel melting and casting processes were conducted in an open-type induction furnace.The heat treatment of the samples was performed in a standard muffle furnace under an air atmosphere.The samples underwent quenching in water, oil, and saline water.Plastic deformation of the samples was carried out using a press.The micro-structure of the samples was analyzed using a Leica DM IRM inverted microscope both before and after etching.As a result of the experimental procedures, steel samples exhibiting tensile strengths of 1215 MPa and 1256 MPa, impact toughness values of 23 J and 28 J, and Brinell hardness values of 334 HB and 384 HB were obtained.The technology of high-strength steels is being developed in Kazakhstan for the first time and is a novelty for our country.All steel alloys produced at enterprises in Kazakhstan have low mechanical properties.The development of such steels would give an impetus to the advancement of materials science.