Nanoparticle Additions Improve the Corrosion Performance of Ni-Cr-Fe-Based Cast Superalloys

The present work investigated the influence of TiC nanoparticles on the microstructure and corrosion performance of a cast superalloy K4169. The eutectic Laves phase is reduced and the as-cast grain size is refined by adding 0.02 wt.% TiC. The formation of δ phases (Ni 3 Nb) during heat treatments is also suppressed. Thus, the K4169 superalloy with TiC nanoparticles shows better corrosion resistance in sulfuric acid solution (10 vol.% H 2 SO 4 solution). This work provides a strategy to effectively improve the corrosion resistance of conventional cast superalloys.