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Using differential thermal analysis (DTA) to determine solvus temperature of precipitated phases in a Nb-hardened superalloy, such as alloy 718, is relatively difficult. The precipitation reaction is not significantly pronounced, and the baseline of a DTA thermogram is not clearly defined. A new approach was employed in this study, which utilized a solution-treated Inconel alloy 7 18 as the reference instead of the conventional alumina. The samples for analysis were preaged at various temperatures to develop specific precipitate phases. The DTA thermograms showed a well-defined baseline because of similar alloy chemistry and heat capacity between the sample and the reference. The offset of thermal peaks associated with precipitate dissolution can be accurately determined. Superalloys 718,625, 706 and Various Derivatives Edited by E.A. Loria The Minerals, Metals & Materials Society, 1997 353

A New DTA Approach for Verifying Precipitate Solvus in Inconel Alloy 718