Procedure for selecting the low alloy-tempered steel for manufacturing the responsible highly loaded parts

Abstract

The procedure for selecting the optimal material for manufacturing the highly loaded responsible parts is presented in this paper. The proper selection of material can be done exclusively based on the theoretical and experimental analysis of properties of steel in question. The theoretical and experimental selecting of adequate steel for manufacturing the machine parts is done based on requirements arising from their working conditions. Based on the available data for various steels, chemical composition, mechanical and technological properties, available CCT diagram, the optimal steel was selected for the given working conditions. After the selection of the material, experimental investigations were conducted on specially prepared material samples. The real chemical composition of material was established, its most important mechanical properties were determined, the hardness was measured and the microstructure was determined, as well. After the conducted theoretical and experimental investigations, the responsible machine part was manufactured by forging. Then, the mechanical and heat processing was executed, after which the part was tested in the real working conditions. Based on investigations of part's behavior in the real working conditions it was concluded that the selection of the material was adequate.