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STUDY OF M23C6 PRECIPITATION IN A 45Ni-35Cr-Nb ALLOY

2019; Volume: 25; Issue: 3 Linguagem: Inglês

10.12776/ams.v25i3.1312

1338-1156

Matías Humberto Sosa Lissarrague, Alejandro Sepulveda Buitrago, Alberto Carlos Picasso,

Intermetallics and Advanced Alloy Properties

The 45Ni-35Cr-Nb alloy, commonly known as ET45 micro, produced in the form of centrifugally cast tubes, was studied by means of optical microscopy after aging treatments at 1073 and 1173 K for different times. A description of M23C6 secondary carbides precipitation phenomenon was made as a function of time. The analysis after using the Johnson–Mehl–Avrami–Kolmogorov (JMAK) model showed that the secondary carbide precipitation occurs in a single stage. It was found that this phenomenon, which is assisted by diffusion, has an activation energy of 196 kJ/mol.