Inconel 718 is a nickel-chromium-iron superalloy which presents excellent mechanicalproperties at high temperatures, as well as good corrosion resistance and weldability. Thesecharacteristics can be optimized with an appropriate control of microstructural features such as grainsize and precipitation. Precipitates of different nature can form in these alloys, i.e. γ’’ (a metastablemetallic compound Ni3Nb), γ’ (Ni3(Ti, Al), carbides and/or δ phase (intermetallic Ni3Nb). Agingtreatments are usually designed to obtain the precipitation required in order to optimize mechanicalproperties. However, precipitation can also appear induced by deformation and therefore interferewith hot forming operations, such as forging. Under these conditions, precipitation may lead to anincrease of the loads required to carry out the process. The aim of the work was the characterizationof precipitation kinetics for Inconel 718. With this purpose, stress relaxation tests were carried outat temperatures ranging from 950°C to 800°C. Moreover, different amounts of deformation wereapplied to the samples, prior to stress relaxation, to evaluate the effect of this variable on inducingprecipitation. Some samples were quenched at different relaxation times for metallographicevaluation. The results obtained through mechanical testing, together with a proper characterizationof precipitation by Scanning Electron Microscopy, were the basis for obtaining precipitation-timetemperature(PTT) diagrams after different deformation conditions.