高速炉構造用SUS316鋼溶接継手のクリープ疲労き裂進展評価

概要

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Low carbon-medium nitrogen 316 stainless steel(316FR)with improved creep strength was developed for structural material for the demonstration fast breeder reactor(FBR).Fatigue, creep-fatigue and creep crack propagation tests have been conducted using CT specimens of 316FR welded joints at 650°C in order to investigate the applicability of crack propagation evaluation methods to welded joints.The results obtained are as follows.The fatigue J-integral range of welded joints could be estimated using material data of the base metal by the simplified J-integral estimation methods, the reference stress method and the GE/EPRI method, when the crack opening ratio were considered.Heating time(testing time)made a difference in creep-fatigue and creep crack propagation rates estimated by the creep J-integral range.It was considered that the degradation of microstructure(from delta ferrite into sigmaphase)by high temperature aging, which reduced ductility, affected the crack propagation behavior.
社団法人日本材料学会の論文
2000-03-15