Role of welding residual strain and ductility dip cracking on corrosion fatigue behavior of Alloy 52/52M dissimilar metal weld in borated and lithiated high-temperature water

Jun Gao^1,2，Jibo Tan¹，Ming Jiao³，Xinqiang Wu¹，Lichen Tang³，Yifeng Huang³

1. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials,Institute of Metal Research, Chinese Academy of Sciences2. School of Materials Science and Engineering, University of Science and Technology of China3. Shanghai Nuclear Engineering Research and Design Institute

摘 要：Corrosion fatigue behavior of Alloy 52/52 M dissimilar metal weld（DMW） was investigated in borated and lithiated high-temperature water.The fatigue life of Alloy 52/52 M DMW in high-temperature water decreased in comparison with that in air.The fatigue cracks initiated at Alloy 52 M butt weld or at the interface of Alloy 52 buttering and Alloy 52 M butt weld.The welding residual strain and ductility dip cracking in Alloy 52 M butt weld promoted the initiation and propagation of fatigue cracks.The environmentally assisted fatigue damage in high-temperature water is discussed by taking account of microstructure defects.

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