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Journal of Materials Science

, Volume 48, Issue 6, pp 2447–2453 | Cite as

On the mechanism of intergranular stress corrosion cracking of sensitized stainless steel in tetrathionate solution

  • Akio Yonezu
  • Ryota Kusano
  • Xi Chen
Article

Abstract

Intergranular stress corrosion cracking (SCC) mechanism in sensitized stainless steel (Type 304) was investigated experimentally. A tetra-thionic potassium (K2S4O6) chemical solution was used to mimic polythionic acid SCC which the most aggressive SCC type. During the SCC test, the steel specimen was subjected to three-point bending with constant strain at room temperature, and simultaneous monitoring of acoustic emission and corrosion potential were employed to monitor SCC initiation and progression. At the early stage, transient phenomenon of local anodic dissolution was observed. Upon initiation of SCC, passivation film fracture and dissolution of metal at specimen surface take place. Through microscopic observation of SCC tip, it was found that the SCC tip advanced along the grain boundary with further mechanical loading. This suggested that the stress component plays a significant role of SCC propagation, in addition to the effect of the localized metal dissolution along Cr-depleted grain boundaries.

Keywords

Acoustic Emission Stress Corrosion Crack Hydrogen Embrittlement Anodic Dissolution Boundary Separation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We would like to thank Professor Mikio Tekemoto (Aoyama Gakuin University, Kanmeta Engineering Co., Ltd.) for his guidance. The work of A.Y. is supported in part of Grant-in-Aid for Young Scientist of (B) (No. 22760077) of the Ministry of Education, Culture, Sports, Science and Technology, Japan, and Research Grant for Science and Technology of SUZUKI Foundation. The work of X.C. is supported by the National Natural Science Foundation of China (11172231), the World Class University program through the National Research Foundation of Korea (R32-2008-000-20042-0), and the National Science Foundation (CMMI-0643726).

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  1. 1.Department of Precision MechanicsChuo UniversityBunkyo, TokyoJapan
  2. 2.Department of Earth and Environmental EngineeringColumbia UniversityNew YorkUSA
  3. 3.International Center for Applied Mechanics, SV LabSchool of Aerospace, Xi’an Jiaotong UniversityXi’anChina

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