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

Authors

  • Matías Humberto Sosa Lissarrague a:1:{s:5:"en_US";s:301:"IFISUR, Universidad Nacional del Sur, CONICET, Departamento de Física - UNS, Av. L. N. Alem 1253, B8000CPB, Bahía Blanca, Argentina - Laboratorio de Metalurgia y Tecnología Mecánica, Universidad Nacional del Sur, Departamento de Ingeniería, Av. L. N. Alem 1253, B8000CPB, Bahía Blanca, Argentina";}
  • Alejandro Sepulveda Buitrago
  • Alberto Carlos Picasso

DOI:

https://doi.org/10.12776/ams.v25i3.1312

Keywords:

JMAK model, 45Ni-35Cr-Nb alloy, secondary carbide precipitation, aging

Abstract

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.

Downloads

Published

2019-09-25