Investigation of the grain growth behaviour in Inconel 718 superalloy

[EN] Superalloys are generally used in the hot sections of gas-turbine engines due to their excellent high temperature properties with respect to strength, creep, and hot-corrosion resistance. For this kind of application, the Inconel 718 nickel-base superalloy has found widespread usage because of their lower cost compared with other superalloys accompanied with good material properties. The technological importance of grain growth originates from the dependence of the material properties from the microstructure, and in particular the dependence of the mechanical behaviour on the grain size. In materials for structural application at lower temperatures, a small grain size is normally required to optimise the strength and toughness. However, in order to improve the high temperature creep resistance of a material, a large grain size is required. Objective: The main objective of this work, aims to study the effects of annealing parameters on the grain-growth kinetics during of the Inconel 718 superalloy. In particular, the effect of the short-term annealing in the high-temperature domain (> 1040°C) and the long-term annealing in the low-temperature domain ( 1040 ° C) y el recocido a largo plazo en el dominio de baja temperatura (