文献类型：期刊文献

英文题名：Thermal aging effect on the tensile and fatigue properties of the narrow-gap TIG welded joints in offshore floating nuclear power plants

作者：Yu, Weiwei[1,2];Fan, Minyu[2];Jia, Wenqing[2];Xue, Fei[2];Yu, Min[2];Liu, Hui[3];Chen, Xu[1]

机构：[1]Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China;[2]Suzhou Nucl Power Res Inst, Suzhou 215004, Peoples R China;[3]East China Univ Sci & Technol, Sch Pharm, Shanghai Key Lab New Drug Design, Shanghai 200237, Peoples R China

年份：2019

卷号：126

起止页码：143

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20192006912873);WOS:【SCI-EXPANDED(收录号:WOS:000472688800015)】；

基金：The authors gratefully acknowledge financial support for this work from the National Key Research and Development Program of China (2017YFB0702200), National Natural Science Foundation of China (No. 51435012) and Natural Science Foundation of Jiangsu Province (BK20171223).

语种：英文

外文关键词：Thermal aging; TIG welded joint; Fatigue; Pressure piping

摘要：In offshore floating nuclear power plants, the narrow-gap tungsten-inert gas (TIG) welding method is commonly applied to connect various geometries of pipes due to its high efficiency welding under the low heat input of the welding process. However, the narrow-gap TIG welds have a duplex structure and are sensitive to thermal aging mechanism. In this paper, the narrow-gap TIG joints were subjected to a series of accelerated thermal aging tests at 400 degrees C for 0, 2000, 5000, 13,000 and 30,000 h, respectively, to investigate the tensile and fatigue properties at different locations. The test results indicated that the yield strength and the ultimate tensile strength of the narrow-gap TIG welded joints increased with the increasing thermal aging time. Fatigue life increased along with the thermal aging duration. A modified life prediction model was proposed.