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 language | English |
|---|---|
| Pages (from-to) | 8275-8281 |
| Number of pages | 7 |
| Journal | Applied Surface Science |
| Volume | 257 |
| Issue number | 19 |
| DOIs | |
| Publication status | Published - Jul 15 2011 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Constant-load delayed fracture test of atmospherically corroded high strength steels
AU - Akiyama, Eiji
AU - Matsukado, Katsuhiro
AU - Li, Songjie
AU - Tsuzaki, Kaneaki
PY - 2011/7/15
Y1 - 2011/7/15
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=79958807730&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2011.03.037
DO - 10.1016/j.apsusc.2011.03.037
M3 - Article
AN - SCOPUS:79958807730
VL - 257
SP - 8275
EP - 8281
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
IS - 19
ER -