Abstract
Influence of Co on the coarsening behavior of γ’ phase in Ni-base superalloy was investigated. Long term thermal exposure at 750 °C and 850 °C were carried out on alloys with Co contents of 10, 20, 25 wt%. The coarsening rates of γ’ phase were observed to decrease gradually with increasing Co content ascribed to the lower interfacial energy between γ and γ’ in high Co content alloy. In addition, γ′ phase morphology after thermal exposure at 750 °C shows the cubic shape in low Co content alloy and spherical shape in the high Co content alloy. γ′ phase morphology evolution during thermal exposure is found to be highly related to the γ/γ′ misfit.
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