|About this Abstract
||MS&T23: Materials Science & Technology
||Steels for Sustainable Development II
||G-11: Effect of Cooling Rate and Tempering Temperature on Hydrogen Embrittlement of Tempered Martensitic Steel for High-pressure Hydrogen Storage
||Sang-Gyu Kim, Hee-Chang Shin, Byoungchul Hwang
|On-Site Speaker (Planned)
Tempered martensitic steel has been widely used as a material for high-pressure hydrogen storage and transportation due to its excellent combination of high strength and ductility, contributing to sustainable development efforts aimed at reducing carbon emissions and transitioning to cleaner energy sources. To improve the hydrogen embrittlement (HE) resistance of tempered martensitic steel, it is crucial to control the heat treatment conditions and alloying elements because the HE resistance is strongly influenced by various microstructural factors such as phase fraction, dislocation density, and carbides characteristics. In this study, tempered martensitic steels with different microstructure factors were fabricated by varying cooling rate and tempering temperature, and the tensile and fracture behaviors were investigated by using a slow strain-rate tensile test after electrochemical hydrogen charging. Thermal desorption spectroscopy, silver decoration, and fractography analysis were conducted on the hydrogen pre-charged steel specimens to understand the HE mechanism in terms of hydrogen trapping.