Abstract
This study showed that high-density nano-precipitates, which have not been observed before, formed in the carbon-enriched zone located 20 µm away from the fusion boundary of the dissimilar metal welds of Alloy 52M and A508 steel. The nano-precipitate, which was named as CrCx in this study, was in a rodlike shape and shorter than 30 nm. The atoms of CrCx were arranged as a face-centered cubic (FCC) crystal. The CrCx precipitates have a lattice parameter of 4.08 Å and a cube-on-cube orientation relationship with the austenitic matrix of Alloy 52M. The results will be of great benefit to the development of advanced dissimilar metal welds and new Ni-based alloys serviceable in a harsh environment.
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