Influence of the applied stress rate on the stress corrosion cracking of 4340 and 3.5NiCrMoV steels under conditions of cathodic hydrogen charging

Ramamurthy, S., Lau, W. M. L. and Atrens, A. (2011) Influence of the applied stress rate on the stress corrosion cracking of 4340 and 3.5NiCrMoV steels under conditions of cathodic hydrogen charging. Corrosion Science, 53 7: 2419-2429. doi:10.1016/j.corsci.2011.03.028


Author Ramamurthy, S.
Lau, W. M. L.
Atrens, A.
Title Influence of the applied stress rate on the stress corrosion cracking of 4340 and 3.5NiCrMoV steels under conditions of cathodic hydrogen charging
Journal name Corrosion Science   Check publisher's open access policy
ISSN 0010-938X
Publication date 2011-07
Sub-type Article (original research)
DOI 10.1016/j.corsci.2011.03.028
Volume 53
Issue 7
Start page 2419
End page 2429
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2012
Language eng
Formatted abstract
Stress corrosion cracking (SCC) of as-quenched 4340 and 3.5NiCrMoV steels was studied under hydrogen charging conditions, with a cathodic current applied to the gauge length of specimens subjected to Linearly Increasing Stress Test (LIST) in 0.5 M H2SO4 solution containing 2 g/l arsenic trioxide (As2O3) at 30 °C. Applied stress rates were varied from 20.8 to 6 × 10−4 MPa s−1. Both the fracture and threshold stress decreased with decreasing applied stress rate and were substantially lower than corresponding values measured in distilled water at 30 °C at the open circuit potential. The threshold stress values correspond to 0.03–0.08 σy for 4340 and 0.03–0.2 σy for the 3.5NiCrMoV steel. SCC velocities, at the same applied stress rate, were an order of magnitude greater than those in distilled water. However, the plots of the crack velocity versus applied stress rate had similar slopes, suggesting the same rate-limiting step. The fracture surface morphology was mostly intergranular, with quasi-cleavage features.
Keyword Steel
Hydrogen embrittlement
Stress corrosion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2012 Collection
 
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Created: Tue, 10 Jan 2012, 11:27:43 EST by Katie Gollschewski on behalf of School of Mechanical and Mining Engineering