Investigation for the Response of High Strength Steel 42CrMo4 to in-situ Hydrogen Loading through Tensile Testing

Abstract

Hydrogen embrittlement remains a significant challenge in industries requiring high-strength materials operating in hydrogen-rich environments. This study examined the Investigation for the Response of High Strength Steel 42CrMo4 to in-situ hydrogen loading through tensile testing, aiming to unravel the intricate relationship between electrochemical conditions, hydrogen exposure, and the mechanical properties of the alloy steel. Slow strain rate tests were employed to comprehensively explore the material's response under varying conditions. The uncharged specimen in test-1 exhibited remarkable mechanical properties, including high tensile strength, appreciable hardness, and substantial elongation. The microstructural analysis confirmed the presence of a martensitic structure, reflecting inherent strength. However, as the current density increased in tests-2 and 3, hydrogen-induced embrittlement manifested. These tests revealed diminished mechanical integrity, evidenced by decreased ultimate tensile strength, reduced hardness, and limited elongation. The fracture modes observed, characterized by brittle fractures and distinctive fracture surfaces, underscored the susceptibility of 42CrMo4 to hydrogen embrittlement. In conclusion, this research advances the understanding of how current density interacts with hydrogen loading, influencing the mechanical properties of 42CrMo4 alloy steel. The findings contribute to theoretical knowledge, practical applications, and the pursuit of materials that thrive in demanding hydrogen-rich environments. As industries seek to fortify their materials against evolving challenges, the insights from this study provide a solid foundation for the development of hydrogen-resistant components, ensuring safer and more reliable structures in the face of adverse conditions.