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Impact of Hot Bending on the High-Temperature Performance and Hydrogen Damage of 2.25Cr-1Mo-0.25V Steel

  • Song Huang
  • Zhiping Chen
  • You Li
  • Delin Zhang
Article
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Abstract

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.

Keywords

high-temperature property hot bending forming hydrogen damage hydrogenation reactor manufacturing residual influence 2.25Cr-1Mo-0.25V 

Notes

Acknowledgment

This work was supported by National Key Basic Research and Development Project of China (973 Project, No. 2015CB057603).

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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Institute of Process EquipmentZhejiang UniversityHangzhouPeople’s Republic of China

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