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Investigation of Hydrogen Embrittlement Susceptibility of X80 Weld Joints by Thermal Simulation

  • Huangtao Peng
  • Teng An
  • Shuqi Zheng
  • Bingwei Luo
  • Siyu Wang
  • Shuai Zhang
Article
  • 83 Downloads

Abstract

The objective of this study was to investigate the hydrogen embrittlement (HE) susceptibility and influence mechanism of X80 weld joints. Slow strain rate testing (SSRT) under in situ H-charging, combined with microstructure and fracture analysis, was performed on the base metal (BM), weld metal (WM), thermally simulated fine-grained heat-affected zone (FGHAZ) and coarse-grained heat-affected zone (CGHAZ). Results showed that the WM and simulated HAZ had a greater degree of high local strain distribution than the BM; compared to the CGHAZ, the FGHAZ had lower microhardness and more uniformly distributed stress. SSRT results showed that the weld joint was highly sensitive to HE; the HE index decreased in the following sequence: FGHAZ, WM, CGHAZ and BM. The effect of the microstructure on HE was mainly reflected in microstructure, local stress distribution and microhardness.

Keywords

hydrogen embrittlement thermal simulation weld joints X80 

Notes

Acknowledgments

This work was financially supported by the Natural Science Foundation of China (No. 51671215).

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Huangtao Peng
    • 1
  • Teng An
    • 1
  • Shuqi Zheng
    • 1
    • 2
  • Bingwei Luo
    • 1
  • Siyu Wang
    • 1
  • Shuai Zhang
    • 1
  1. 1.State Key Laboratory of Heavy Oil Processing and Department of Materials Science and EngineeringChina University of PetroleumBeijingChina
  2. 2.Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/Gas Facility MaterialsChina University of PetroleumBeijingChina

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