Impact of Hot Bending on the High-Temperature Performance and Hydrogen Damage of 2.25Cr-1Mo-0.25V Steel
- 62 Downloads
The impact of hot bending forming process on the high-temperature mechanical properties and hydrogen damage of 2.25Cr-1Mo-0.25V steel was investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), energy-dispersive spectrum (EDS) and the slow strain rate tensile (SSRT) test in high-temperature hydrogen environment. The samples containing hot bending residual influence were extracted from a real hydrogenation reactor shell fabricated through hot bending–welding process. SEM images of the material demonstrated that the density and size of carbides in 2.25Cr-1Mo-0.25V increased after forming. TEM and EDS results revealed that ferrite matrix of the formed material was purified. The mechanical properties measured by SSRT test manifested that 2.25Cr-1Mo-0.25V was softened after forming. Moreover, it was observed that high-temperature hydrogen environment embrittled the material and the susceptibility to hydrogen damage increased after forming. The role of hot bending process on the evolution of mechanical properties and hydrogen damage susceptibility was discussed. Possible mechanism for the impact of hot bending process on the high-temperature hydrogen damage was proposed.
Keywordshigh-temperature property hot bending forming hydrogen damage hydrogenation reactor manufacturing residual influence 2.25Cr-1Mo-0.25V
This work was supported by National Key Basic Research and Development Project of China (973 Project, No. 2015CB057603).
- 2.D. Zeng, S.D. Liu, V. Makam, S. Shetty, L. Zhang, and F. Zweng, Specifying Steel Properties and Incorporating Forming Effects in Full Vehicle Impact Simulation. In: SAE 2002 World Congress & Exhibition 2002Google Scholar
- 4.Y. Wang, G. Cheng, M. Qin, Q. Li, Z. Zhang, K. Chen, Y. Li, H. Hu, W. Wu, and J. Zhang, Effect of High Temperature Deformation on the Microstructure, Mechanical Properties and Hydrogen Embrittlement of 2.25Cr-1Mo-0.25V Steel, Int. J. Hydrogen Energy, 2017, 42(38), p 24549–24559CrossRefGoogle Scholar
- 6.Z. Jiang, P. Wang, D. Li, and Y. Li, Effects of Tempering Temperature on the Microstructure and Mechanical Properties of Granular Bainite in 2.25 Cr-1Mo-0.25V Steel, Acta Metall. Sin., 2015, 51(8), p 925–934Google Scholar
- 9.RP941 A, Steels for Hydrogen Service at Elevated Temperatures and Pressures in Petroleum Refineries and Petrochemical Plants, API, Publishing Services, Washington, DC, 2016Google Scholar
- 16.Nagumo M (2016) Deformation Behaviors. In: Fundamentals of Hydrogen Embrittlement. Springer, Berlin, pp. 79–101Google Scholar
- 29.Nagumo M (2016) Mechanistic Aspects of Fracture II ~ Plasticity-Dominated Fracture Models. In: Fundamentals of Hydrogen Embrittlement. Springer, Berlin, pp. 217-239Google Scholar