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Journal of Materials Engineering and Performance

, Volume 23, Issue 4, pp 1358–1365 | Cite as

Effect of Strength and Microstructure on Stress Corrosion Cracking Behavior and Mechanism of X80 Pipeline Steel in High pH Carbonate/Bicarbonate Solution

  • Min Zhu
  • Cuiwei Du
  • Xiaogang Li
  • Zhiyong Liu
  • Shengrong Wang
  • Tianliang Zhao
  • Jinghuan Jia
Article

Abstract

The stress corrosion cracking (SCC) behaviors and mechanisms of X80 pipeline steels with different strength and microstructure in high pH carbonate/bicarbonate solution were investigated by slow strain rate testing and electrochemical test. The results showed that the cracking mode of low strength X80 steel composed of bulky polygonal ferrite and granular bainite in high pH solution was intergranular (IGSCC), and the SCC mechanism was anodic dissolution (AD). While the mixed cracking mode of high strength X80 steel consisted of fine acicular ferrite and granular bainite was intergranular (IGSCC) in the early stage, and transgranular (TGSCC) in the later stage. The decrease of pH value of crack tip was probably the key reason for the occurrence of TGSCC. The SCC mechanism may be a mixed mode of AD and hydrogen embrittlement (HE), and the HE mechanism may play a significant role in the deep crack propagation at the later stage. The cracking modes and SCC mechanisms of the two X80 steels were associated with its microstructure and strength.

Keywords

X80 pipeline steel stress corrosion cracking strength and microstructure hydrogen embrittlement 

Notes

Acknowledgments

The authors are grateful for the financial support from the National Natural Science Foundation of China (Registration No. 51371036 and No. 51131001).

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Copyright information

© ASM International 2014

Authors and Affiliations

  • Min Zhu
    • 1
  • Cuiwei Du
    • 1
  • Xiaogang Li
    • 1
  • Zhiyong Liu
    • 1
  • Shengrong Wang
    • 1
  • Tianliang Zhao
    • 1
  • Jinghuan Jia
    • 1
  1. 1.Corrosion and Protection Center, School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingPeople’s Republic of China

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