Constant-load delayed fracture test of atmospherically corroded high strength steels

Eiji Akiyama, Katsuhiro Matsukado, Songjie Li, Kaneaki Tsuzaki

Research output: Contribution to journalArticle

14 Citations (Scopus)


Constant load tests of circumferentially notched round bar specimens of high strength steels after cyclic corrosion test and outdoor exposure have been performed to demonstrate that delayed fracture occurs when the hydrogen content from the environment, H E , exceeds the critical hydrogen content for delayed fracture, H C . During the constant load tests the humidity around the specimen was increased in stepwise manner to increase hydrogen entry. After fracture the specimen was kept at the humidity long enough to homogenize hydrogen in the specimen and to obtain more quantitative hydrogen content by thermal desorption analysis. H E of the fractured specimens was higher than H C , and H E of the specimens not fractured was lower than H C . This result confirms that the balance between H C and H E determines the occurrence of delayed fracture and that hydrogen-content-based evaluation of susceptibility to delayed fracture is reasonable. To certify the increase of H E with increase in humidity, electrochemical hydrogen permeation test was carried out. The hydrogen permeation current density was increased especially at 98%RH. Enhancement of hydrogen entry with increase in CCT number was also shown by the test.

Original languageEnglish
Pages (from-to)8275-8281
Number of pages7
JournalApplied Surface Science
Issue number19
Publication statusPublished - 2011 Jul 15
Externally publishedYes


  • Atmospheric corrosion
  • Delayed fracture
  • High strength steel
  • Hydrogen embrittlement

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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