The effects of sample mass and heating rate on differential thermal analysis (DTA) curves were investigated. Available methods for determining gamma prime(γ′)solvus, solidus and liquidus were analyzed and compared separately. This study improves methods for determining solidus and identifies optimal methods for measuring temperature of γ′solvus, solidus and liquidus. Transformation temperatures of FGH96 samples prepared by hot isostatic pressing(HIP), hot extrusion(HEX) and heat treatment(HT) were tested. DTA curves do not show significant differences.Appropriate sample mass and heating rate are obtained, and auniversalapplicable analysis method of DTA curves for dermining phase transformation temperatures of powder metallurgy superalloy is proposed.

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