Details
| Original language | English |
|---|---|
| Pages | 343-352 |
| Number of pages | 10 |
| Publication status | Published - 1996 |
| Externally published | Yes |
| Event | 1994 5th International Conference on the Effect of Hydrogen on the Behavior of Materials - Moran, WY, USA Duration: 11 Sept 1994 → 14 Sept 1994 |
Conference
| Conference | 1994 5th International Conference on the Effect of Hydrogen on the Behavior of Materials |
|---|---|
| City | Moran, WY, USA |
| Period | 11 Sept 1994 → 14 Sept 1994 |
Abstract
The effects of absorbed hydrogen with low to intermediate input activity on the fatigue behaviour of a spheroidized low alloy steel were studied. The fatigue tests indicated that the crack growth rate increases monotonically with the hydrogen input activity. Hydrogen gas pressures as low as 10-5 mbar were found to influence the crack growth rate as compared to ultra-high vacuum. The microstructural studies revealed that the observed increase in fatigue crack growth rate in the presence of hydrogen is a consequence of an increased micro-crack nucleation rate at carbide-ferrite interfaces in the plastic zone ahead of the main crack. Hydrogen swept-in by moving dislocations reduces the cohesive forces at these interfaces. Moreover, transmission electron microscopy and X-ray studies both showed a change in the bulk dislocation arrangement when specimens were cyclically deformed in gaseous hydrogen as a result of hydrogen-enhanced plasticity. This in turns affects the hydrogen transport rate as observed by hydrogen permeation studies.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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1996. 343-352 Paper presented at 1994 5th International Conference on the Effect of Hydrogen on the Behavior of Materials, Moran, WY, USA.
Research output: Contribution to conference › Paper › Research › peer review
}
TY - CONF
T1 - Hydrogen effects on cyclic deformation behaviour of a low alloy steel
AU - Maier, H. J.
AU - Popp, W.
AU - Kaesche, H.
PY - 1996
Y1 - 1996
N2 - The effects of absorbed hydrogen with low to intermediate input activity on the fatigue behaviour of a spheroidized low alloy steel were studied. The fatigue tests indicated that the crack growth rate increases monotonically with the hydrogen input activity. Hydrogen gas pressures as low as 10-5 mbar were found to influence the crack growth rate as compared to ultra-high vacuum. The microstructural studies revealed that the observed increase in fatigue crack growth rate in the presence of hydrogen is a consequence of an increased micro-crack nucleation rate at carbide-ferrite interfaces in the plastic zone ahead of the main crack. Hydrogen swept-in by moving dislocations reduces the cohesive forces at these interfaces. Moreover, transmission electron microscopy and X-ray studies both showed a change in the bulk dislocation arrangement when specimens were cyclically deformed in gaseous hydrogen as a result of hydrogen-enhanced plasticity. This in turns affects the hydrogen transport rate as observed by hydrogen permeation studies.
AB - The effects of absorbed hydrogen with low to intermediate input activity on the fatigue behaviour of a spheroidized low alloy steel were studied. The fatigue tests indicated that the crack growth rate increases monotonically with the hydrogen input activity. Hydrogen gas pressures as low as 10-5 mbar were found to influence the crack growth rate as compared to ultra-high vacuum. The microstructural studies revealed that the observed increase in fatigue crack growth rate in the presence of hydrogen is a consequence of an increased micro-crack nucleation rate at carbide-ferrite interfaces in the plastic zone ahead of the main crack. Hydrogen swept-in by moving dislocations reduces the cohesive forces at these interfaces. Moreover, transmission electron microscopy and X-ray studies both showed a change in the bulk dislocation arrangement when specimens were cyclically deformed in gaseous hydrogen as a result of hydrogen-enhanced plasticity. This in turns affects the hydrogen transport rate as observed by hydrogen permeation studies.
UR - http://www.scopus.com/inward/record.url?scp=0029700680&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:0029700680
SP - 343
EP - 352
T2 - 1994 5th International Conference on the Effect of Hydrogen on the Behavior of Materials
Y2 - 11 September 1994 through 14 September 1994
ER -