材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
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
高橋 浩之宇野 哲老田中 弘一
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2000 年 49 巻 3 号 p. 322-326

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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.

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