Abstract
This work presents the effects of the solid solution and double aging heat treatments of the superalloy Inconel 718 (I-718) and the characterization of their microstructure properties by optical microscope (OM), scanning electronic microscope (SEM), hardness Vickers (HV), and hardness (RA, RB, and RC). The relationship between microstructure and mechanical properties, according to the norm AMS5663 (Aerospace Material Standards, USA), was studied too. Solid solution heat treatments were performed at 1078 °C/1 h and water quenching. Double aging heat treatment was carried out at 720 °C/8 h and then cooling furnace 1 h to 620 °C/8 h and then cooling by air. Solid solution heat treatment dissolved precipitates, and boundary grains and δ phase (Ni3/Nb) also reduced hardness which facilitates specimens machining with dimensions and morphology; these dimensions will be used for future ultrasonic fatigue testing and have been obtained according to a modal analysis by finite element method. Once specimen machining was completed, double aging heat treatment (precipitation hardening) was performed; this heat treatment leads to increased hardness according to the norm AMS5663 for subsequent tests in ultrasonic fatigue.
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