J. Mater. Sci. Technol. ›› 2020, Vol. 42: 163-174.DOI: 10.1016/j.jmst.2019.10.012

• Orginal Article • Previous Articles     Next Articles

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 Gaoab, Jibo Tana, Ming Jiaoc, Xinqiang Wua*(), Lichen Tangc, Yifeng Huangc   

  1. a 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 Sciences, Shenyang, 110016, China
    b School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
    c Shanghai Nuclear Engineering Research and Design Institute, Shanghai, 200233, China
  • Received:2019-07-11 Revised:2019-08-23 Accepted:2019-10-05 Published:2020-04-01 Online:2020-04-16
  • Contact: Wu Xinqiang

Abstract:

Corrosion fatigue behavior of Alloy 52/52M dissimilar metal weld (DMW) was investigated in borated and lithiated high-temperature water. The fatigue life of Alloy 52/52M DMW in high-temperature water decreased in comparison with that in air. The fatigue cracks initiated at Alloy 52M butt weld or at the interface of Alloy 52 buttering and Alloy 52M butt weld. The welding residual strain and ductility dip cracking in Alloy 52M 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.

Key words: Superalloys, Corrosion fatigue, High temperature corrosion, Welding