On the role of hydrogen in the stress corrosion cracking behavior of Q345R steel in HF vapor environment

• Published in: International journal of hydrogen energy 2023-08, Vol.48 (73), p.28549-28566
• Main Authors: Tang, Jiahui, Shi, Shouwen, Dai, Hailong, Hu, Jiaqi, Guo, Can, Chen, Xu
• Format: Article
• Language: English
• Subjects: HF vapor; Hydrogen embrittlement; Pearlite-ferrite; Q345R steel; Slow strain rate test; Stress corrosion cracking
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2023.04.027

The stress corrosion cracking (SCC) behavior of Q345R steel in hydrofluoric acid (HF) vapor environment was investigated. It is shown that Q345R has a high susceptibility to SCC in HF vapor environment, which is negatively correlated with the strain rate. Several different crack morphologies and cracking factors are verified: flat cracks in ferrite are associated with anodic dissolution triggered by micro-galvanic corrosion, and porous cracks at the pearlite and pearlite-ferrite interfaces are mainly influenced by hydrogen. The results of hydrogen charging tests show that pre-charging has little effect on the hydrogen embrittlement of Q345R steel, while in-situ charging leads to severe brittle fracture of the material, because hydrogen interacts with large number of moving dislocations generated by in-situ stretching process and penetrates more readily into the material. The synergistic relationship between hydrogen and dislocation motion is found to be the main mechanism for the transition from ductile to brittle fracture. •The role of hydrogen in SCC behavior of Q345R steel in HF vapor is elucidated.•The SCC susceptibility is negatively correlated with the strain rate.•The crack morphologies and influence factors of ferrite and pearlite are different.•Pre-hydrogen charging has little effect on hydrogen embrittlement of Q345R steel.•The synergetic between hydrogen and dislocation cause brittle fracture.