Multi-technique study of precipitation in the near-fusion boundary region of an aged narrow-gap dissimilar metal weld

In ferrite/austenite dissimilar metal welds, carbon can diffuse from the ferritic low-alloy steel to austenitic weld during heat treatment and thermal aging due large chromium content differences between two alloys. This influx leads precipitation of carbides in high-alloy metal, near fusion boundary, which affect properties joint. was investigated using multiple characterization techniques: electron probe microanalysis, small angle X-ray scattering atom tomography. The studied joint consisted stainless base metals that were arc welded a nickel-based filler metal. Given heterogeneous microstructure such joints, navigation strategy implemented ensure all characterizations carried out same regions interest associated data could later be correlated. precipitates found mostly M23C6. quantified different methods gave comparable results, whose highlight capabilities limitations each technique. Precipitate fractions are higher following but remain far equilibrium cases, indicating kinetics should accounted for model microstructural evolution welds more accurately.