Effect of Hydrogen Corrosion on Key Mechanical Properties of 45 Steel

Abstract

To study the influence of hydrogen corrosion on mechanical properties of materials, this paper adapted 45 steel to determine each mechanical property parameter of 45 steel by tensile test method under different corrosion concentration and time as well as different states, including non-hydrogen escape and hydrogen escape. And the changing rule of strength index and plastic index of material during the process of hydrogen corrosion was obtained. The result shows that the strength index of material just has few changes, its yield strength fluctuates within -5.6Mpa and 7.8Mps and tensile strength reduces by about 2%. After corroding, the plastic index reduces obviously and it is mainly affected by corrosion concentration whether it is in non-hydrogen escape state or in hydrogen escape state. Despite that the plastic index of hydrogen escape state is higher than that of non-hydrogen escape state, it still is less than the original value. In the inner of metal, the influence of diffused hydrogen on plastic index is stronger than that of solid solution hydrogen.