Characterization of solution and precipitation temperatures in CMSX-4 superalloy

GES ALEJANDRO MARIO; FORNARO OSVALDO; PALACIO HUGO A

Procedia Materials Science

Elsevier

Año: 2015 vol. 8 p. 1127 - 1132

2211-8128

Nickel superalloys are used as the material for turbine blades due to their excellent mechanical properties at higher temperature. These excellent properties are a result of the microstructure, wich consist of their hard intermetallic (γ´) phase that is coherently embedded in the Ni-base (γ) phase. The mechanical properties of these superalloys largely depend on the size, morphology and distribution of the (γ´) phase. Both the (γ) and (γ´) phases have fcc crystallographic lattices, although a small misfit exist among them, which strongly influence the microstructural evolution during operation at high temperatures. A comprensive knowledge of the kinetics of these changes is necessary for the design of improved heat treatment processes and for a better understanding of the effects of high temperature service conditions on (γ´) evolution. This is particularly true for conditions for wich coarsening and particle dissolution of the (γ´) phase can occur. In the present study we determined the transformation temperatures, that is start and ending temperatures for solution and precipitation processes of γ´ by using Differential Thermal Analysis-(DTA-TG) measures in a CMSX-4 superalloy.