Creep behavior of conventional and Nb-modified as-cast MAR-M246 superalloy - Alkmin, Luciano Braga; Utada, S.; Chaia, Nabil; Reis, D. A.; Coelho, Gilberto Carvalho; Cormier, Jacqueline; Nunes, Carlos Angelo (Materials science and engineering a-structural materials properties microstructure and processing, 2021)