ENVIRONMENTAL EFFECT ON LOW CYCLE FATIGUE BEHAVIORS OF ALLOY52M DISSIMILAR METAL WELD JOINT IN SIMULATED PWR WATER

摘要

A systematic experimental investigation of environmental effect on fatigue behavior in SA508 Gr.3-Alloy52M-SA182 316LN domestic dissimilar metal welded joint (DMWJ) used for AP1000 nuclear power plant prepared by automatic gas tungsten arc DMWJ has been carried out in this work. A range of strain amplitude and strain rate was applied in different low cycle fatigue (LCF) tests. The LCF tests were performed in a strain control mode in 310°C simulated pressurized water reactor (PWR) environment to evaluate the effects of mixed environment on fatigue life. Stress corrosion cracking (SCC) in DMWJ in primary water of pressurized water reactor was studied. In addition, the effects of environmental effect, such as temperature and dissolved oxygen, on low cycle fatigue behaviors have been discussed. Through experiments and subsequent analysis, the mechanisms of reduced low cycle fatigue life have been investigated for welded joint.