Baldan, Renato [UNESP]da Silva, Antonio Augusto Araújo PintoNunes, Carlos AngeloCouto, Antonio AugustoGabriel, Sinara BorboremaAlkmin, Luciano Braga2018-12-112018-12-112017-02-01Journal of Materials Engineering and Performance, v. 26, n. 2, p. 465-471, 2017.1544-10241059-9495http://hdl.handle.net/11449/173899Solution and aging heat-treatments play a key role for the application of the superalloys. The aim of this work is to evaluate the microstructure of the MAR-M246 nickel-based superalloy solutioned at 1200 and 1250 °C for 330 min and aged at 780, 880 and 980 °C for 5, 20 and 80 h. The γ′ solvus, solidus and liquidus temperatures were calculated with the aid of the JMatPro software (Ni database). The as-cast and heat-treated samples were characterized by SEM/EDS and SEM-FEG. The γ′ size precipitated in the aged samples was measured and compared with JMatPro simulations. The results have shown that the sample solutioned at 1250 °C for 330 min showed a very homogeneous γ matrix with carbides and cubic γ′ precipitates uniformly distributed. The mean γ′ size of aged samples at 780 and 880 °C for 5, 20 and 80 h did not present significant differences when compared to the solutioned sample. However, a significant increasing in the γ′ particles was observed at 980 °C, evidenced by the large mean size of these particles after 80 h of aging heat-treatment.465-471engagingheat-treatmentMAR-M246microstructuresolutionsuperalloyArtigo10.1007/s11665-016-2462-0Acesso aberto2-s2.0-850038486922-s2.0-85003848692.pdf15140195362246320000-0003-4172-3689