In situ strained Inconel 718 superalloy studied by thermoelectric power technique

Thermoelectric power (TEP) of an Inconel 718 superalloy with different microstructure states has been followed during stressing tests. In all cases plastic deformation has been attained. TEP measurement variations of ∼35 nV/°C have been found in microstructural states with desirable phases. Treatments that produce non-desirable phase have shown lower variations. Results indicate that TEP of the Inconel 718 is clearly affected by the elastic and plastic strain induced during tests. A model of the material ΔTEP behaviour induced by the strain is proposed. Thus these encouraged results suggest the TEP technique as a powerful tool to detect non-desirable states and levels of strain into the Inconel 718.