Study of the Microstructural Evolution in a 35Ni-25Cr-Nb Heat-Resistant Alloy by Dilatometry and Electron Microscopy

The dendritic-type microstructure of the 35Ni-25Cr-Nb alloy, in the as-cast condition, consists of an austenitic matrix and two types of eutectic primary carbides; Nb-rich MC type and Cr-rich M23C6 type both present in interdendritic edges and grain boundaries. During aging at 1073 K for different times, M23C6-type secondary carbides precipitate in the matrix while MC-type carbides would transform into a Ni-Nb silicide, known as G-phase (Ni16Nb6Si7). The microstructure of this alloy was characterized by scanning electron microscopy with X-ray mapping, backscattered and secondary electron images, electron backscatter diffraction, and dilatometry, in order to detect the G-phase and analyze the conditions under which it is present. This undesirable silicide could reduce creep strength since Nb-rich carbide to G-phase transformation improves nucleation of microcracks in the interface between matrix and the silicide. Silicon and nickel were found on the edges of primary Nb-rich carbides in the as-cast condition. This could be indicating that the transformation of this carbide into Ni-Nb silicide is in an incipient stage and it probably occurs from the outside to the inside of the Nb carbide.Fil: Sosa Lissarrague, Matías Humberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería. Laboratorio de Metalurgia y Tecnología Mecánica; ArgentinaFil: Limandri, Silvina Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; ArgentinaFil: Prado, Fernando Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Física del Sur. Universidad Nacional del Sur. Departamento de Física. Instituto de Física del Sur; ArgentinaFil: Picasso, Alberto Carlos. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería. Laboratorio de Metalurgia y Tecnología Mecánica; Argentin