Residual stress assessment for dissimilar metal welds in nuclear power plant

• Published in: The International journal of pressure vessels and piping Vol. 206; p. 105018
• Main Authors: Xiong, Qingrong, Qu, Yongxiao, Robin, Vincent, Smith, Mike C.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2023
• Subjects: 18MnD5; Alloy 52; Contour method; Dissimilar metal welds; Neutron diffraction; Residual stress; Dissimilar metal welds; Contour method; Neutron diffraction; Residual stress; 18MnD5; Alloy 52
• ISSN: 0308-0161; 1879-3541
• DOI: 10.1016/j.ijpvp.2023.105018

The European Network on Neutron Techniques Standardization for Structural Integrity (NeT) aims to develop experimental and numerical techniques and standards for the reliable characterization of residual stresses in structural welds. NeT has developed over 20 years and involves over 30 organizations including industrial, academic, and research facilities around the world. The network tackled each specific problem by creating a dedicated Task Group (TG), which undertakes both measurement and modelling studies. NeT TG8 follows on from the successful TG1 and TG4 benchmarks, which studied the dissimilar metal welds (DMW) between 18MnD5 and Alloy 52. The material properties characterization, residual stress measurements and modelling have been conducted for NeT TG8. This paper only presents the NeT TG8 benchmark residual stress measurement in the as welded condition and preliminary simulation results.
•Dissimilar metal weld (DMW) between 18MnD5 steel and Alloy 52 with multi-pass weldments was examined.•Studied the residual stress distribution using contour method and neutron diffraction method.•The predicted phase transformation and coarse grain size in the fusion zone and heat affected zone explain the evolution of the residual stress distribution.