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

Eiji Akiyama, Katsuhiro Matsukado, Songjie Li, Kaneaki Tsuzaki

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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
Volume257
Issue number19
DOIs
Publication statusPublished - Jul 15 2011
Externally publishedYes

Fingerprint

high strength steels
High strength steel
Hydrogen
hydrogen
load tests
humidity
Atmospheric humidity
entry
Permeation
corrosion tests
Thermal desorption
Current density
desorption
occurrences
Corrosion
current density
magnetic permeability
augmentation
evaluation

All Science Journal Classification (ASJC) codes

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

Cite this

Constant-load delayed fracture test of atmospherically corroded high strength steels. / Akiyama, Eiji; Matsukado, Katsuhiro; Li, Songjie; Tsuzaki, Kaneaki.

In: Applied Surface Science, Vol. 257, No. 19, 15.07.2011, p. 8275-8281.

Research output: Contribution to journalArticle

Akiyama, Eiji ; Matsukado, Katsuhiro ; Li, Songjie ; Tsuzaki, Kaneaki. / Constant-load delayed fracture test of atmospherically corroded high strength steels. In: Applied Surface Science. 2011 ; Vol. 257, No. 19. pp. 8275-8281.
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