Effect of tempering temperature on hydrogen embrittlement of X60 pipeline steel

作者：Kangxin Shuai, Yebin Pei, Daowu Zhou, Chong Chai, Shiyao Peng, Li Ba, Bing Wang, Shubiao Yin, Qingyou Liu, Siqian Jia · 发表于：International Journal of Hydrogen Energy · 年份：2025 · DOI：10.1016/j.ijhydene.2025.152682 · 被引用次数：5 · 研究领域：Hydrogen embrittlement and corrosion behaviors in metals、Metal Forming Simulation Techniques、Material Properties and Failure Mechanisms

In this paper, the effects of microstructure changes on the hydrogen diffusion behavior and hydrogen embrittlement (HE) of X60 pipeline steel at different tempering temperatures were systematically investigated through slow strain rate tensile (SSRT) tests, gas phase hydrogen penetration tests and thermal desorption spectroscopy (TDS) tests, combined with scanning electron microscope (SEM), electron backscattering diffraction (EBSD), x-ray diffraction (XRD) and transmission electron microscope (TEM) characterization methods. The results show that with increasing tempering temperature, the I HEA of X60 pipeline steel in H 2 gradually decreases, while the area of the ductile fracture zone on the fracture surface increases. This indicates that the HE of the steel decreases significantly with increasing tempering temperature. When the tempering temperature reaches 660 °C, the comprehensive mechanical properties and HE resistance of X60 steel reach the optimal value. As the tempering temperature increases, the effective grain size of the test steel does not change significantly, while the dislocation density decreases, and the degenerated pearlite (DP) decomposes. Meanwhile, Nb–V composite microalloying promotes the extensive precipitation of the nanoscale (Nb, V, Ti)C second phase particles during the high-temperature tempering. This results in a significant increase in the number of hydrogen traps (N T ) in the steel and a substantial decrease in the apparent diffusion coefficie...