Two dissimilar metal weld (DMW) mock-ups, representative of actual nuclear components, are investigated in this work: a Ringhals Alloy 52 DMW mock-up consisting of two Alloy 52 butterings and a TVO Alloy 52 narrow-gap DMW mock-up without buttering. In this study, the microstructure characterization, the micro- and nanohardness measurements and the carbide analysis across the SA508/nickel-base Alloy 52 fusion boundary of these two mock-ups were performed. Different width of carbon-depleted zone and slightly different carbide types in the low-allow steel (LAS) heat-affected zone were found in these two DMWs. The local hardness mismatch and fusion boundary transition zones at the LAS/nickel-base weld metal interface were analyzed for these two mock-ups.
|20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor, EnvDeg 2022
|17/07/22 → 21/07/22