Influence of high-frequency cyclic loading on mechanical and structural characteristics of rail steel under extreme conditions

Abstract

Abstract In this paper topical issues of change of a microstructure and microhardness in steel at high-frequency vibration influence which is observed in technological pipelines, connected to the pump and compressor equipment. To study the micro-structures of samples after influence of high-frequency loading, the authors used optical microscopy and microhardness testing. Relevant and timely is the task of modelling and subsequent design and construction of railways, taking into account a wide range of geometric and mechanical characteristics, which is most in demand in the construction of artificial structures in the Arctic, due to the large temperature difference and differences in temperature coefficients of materials. The purpose of this work is to study the mechanical and structural characteristics of 40X steel under high-frequency loading conditions. For mechanical and structural studies the authors prepared the samples from a rod of 40X steel with a diameter of 12 mm. The strength properties of steel was evaluated by tension testing, fatigue testing, then structural analysis (metallographic studies) and microhardness testing.