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Vol.5 No.2 previous AA 68-SP10(69-70-71)-NT 58 -59

Academic Articles
Regular Paper (Invited) Vol.5 No.3 (2013) p.185 - p.200
 

Observation of Fatigue Crack Initiation and Growth in Stainless Steel to Quantify Low-Cycle Fatigue Damage for Plant Maintenance

 
Masayuki KAMAYA1*
 
1Institute of Nuclear Safety System, Inc., 64 Sata, Mihama-cho, Fukui 919-1205, Japan
 
Abstract
The influence of hydrogen in steel on the high temperature water oxidation behavior of low carbon austenitic stainless steel Type F316L was investigated in order to clarify the mechanism of SCC initiation in the BWR environment, which is closely associated with the localized oxidation and its acceleration. The steel was charged with hydrogen by means of cathodic electrolysis. And then, the solution-treated (non-charged) and hydrogen-charged steels were subjected to the oxidation test in simulated BWR environment. Experimental results revealed that the size of outer oxide particle increased with increasing hydrogen content, resulting in the hydrogen accelerated oxidation (HAO). Additionally, the oxide of the hydrogen-charged steel was mainly NiFe2O4, whereas Fe3O4 was predominantly formed on the non-charged one. From the result of the small punch test in the BWR environment, it was also indicated that the effect of hydrogen on the oxidation might be almost equivalent to that of applied stress.
 
Keywords
Oxidation, Low carbon austenitic stainless steel, High temperature water, Hydrogen, Stress corrosion cracking, Hydrogen accelerated oxidation
 
Full Paper: PDF EJAM Vol.5No.3 pp.185-200 "Observation of Fatigue Crack Initiation and Growth in Stainless Steel to Quantify Low-Cycle Fatigue Damage for Plant Maintenance"
















Article Information
Article history:
Received 17 June 2013
Accepted 2 September 2013