Effect of gaseous hydrogen on cyclic slip behavior around a stage i fatigue crack tip in an iron alloy

Yoshimasa Takahashi, Junji Sakamoto, Masaki Tanaka, Kenji Higashida, Hiroshi Noguchi

Research output: Contribution to conferencePaper

Abstract

In order to investigate the effect of gaseous hydrogen on cyclic slip behavior around an early stage (stage Ifatigue crack tip, fatigue crack growth (FCGtests using a single-crystalline Fe-3.2wt.%Si alloy are conducted respectively in a hydrogen atmosphere and in a helium atmosphere. The cross-sectional observations of the crack tips by both electron backscatter diffraction (EBSDmethod and transmission electron microscopy (TEMsuccessfully reveal the following points. In helium atmosphere, FCG is preceded by formation of cell structures and crack propagates along cell boundaries. In hydrogen atmosphere, on the other hand, no cells are seen, and crack growth process is similar to that observed in a stage II type FCG. Crack extension resistance in hydrogen is postulated to be lower than that in helium, indicating that the mode of FCG in hydrogen is more critical than that in helium.

Original languageEnglish
Publication statusPublished - Dec 1 2010
Externally publishedYes
Event18th European Conference on Fracture: Fracture of Materials and Structures from Micro to Macro Scale, ECF 2010 - Dresden, Germany
Duration: Aug 30 2010Sep 3 2010

Conference

Conference18th European Conference on Fracture: Fracture of Materials and Structures from Micro to Macro Scale, ECF 2010
CountryGermany
CityDresden
Period8/30/109/3/10

Keywords

  • Crack tip
  • Dislocation structures
  • EBSD
  • Hydrogen embrittlement
  • Iron-silicon alloy
  • Single crystal
  • Stage I fatigue crack growth
  • TEM

ASJC Scopus subject areas

  • Mechanics of Materials

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  • Cite this

    Takahashi, Y., Sakamoto, J., Tanaka, M., Higashida, K., & Noguchi, H. (2010). Effect of gaseous hydrogen on cyclic slip behavior around a stage i fatigue crack tip in an iron alloy. Paper presented at 18th European Conference on Fracture: Fracture of Materials and Structures from Micro to Macro Scale, ECF 2010, Dresden, Germany.