The creation of γ' phase uniform distribution is very important on the performance of superalloys. The addition of secondary solution annealing stage to the conventional heat treatment process of the GTD-111 polycrystalline superalloy which is one of the useful industrial superalloys can lead to improving the microstructure of this alloy by decreasing the amount of eutectic phase and increasing the volume percent and modifying distribution of γ' phase. In this article, the effects of temperatures of 960, 980 and 1000 °C and times of 1, 2, 4 and 8 hrs on the microstructure of GTD-111 superalloy are investigated. Microstructural investigations by OM and SEM methods show the secondary solution heat treatment at temperature of 980˚C for 4 hrs leads to improving the microstructure with respect to decreasing the eutectic phase amount to 4 volume percent and increasing the γ' strengthening phase volume percent to 54%. Also, the morphology of γ' phase after this heat treatment is cuboidal with unimodal and homogenous distribution in the matrix phase. The microstructures of GTD-111 heat treated at other temperatures and times are discussed in the article.
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