Abstract
High temperature oxidation behaviours of γ′-strengthened Co-based superalloys with various Ni additions were investigated at both 800 °C and 900 °C. The results show that the superalloys show excellent oxidation resistance due to the formation of compact spinel oxide scales. With the increasing of Ni addition, the concentration of Cr in scale/alloy interface will be increased but that of Co will be decreased. And the growth of Cr2O3 will be promoted, while CoO nucleation will be hindered. Therefore, increasing Ni addition helps the formation of protective spinel oxide scales and delays nodular oxidation, which favours to be better oxidation resistance.
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