Abstract
The effects of Ru additions on the microstructure and phase stability of the Ni-base superalloy U720LI were examined. The results show that the alloys with Ru contents of 0 to 6 wt pct had a dendritic structure, and the volume fraction of the primary γ solid-solution phase in the dendritic core increased with the increase in the Ru content. The Ru additions to U720LI had little effect on suppressing the formation of the σ phase, because the elemental partitioning of Cr, Mo, and Co in the γ solid-solution phase was not influenced by the Ru additions. However, the coarsening of the γ′ phase was restrained by the Ru additions in the U720LI.
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