J. Phys. Colloques
Volume 49, Numéro C6, Novembre 198835th International Field Emission Symposium / 35éme Symposium International d'Emission de Champ
|Page(s)||C6-391 - C6-396|
J. Phys. Colloques 49 (1988) C6-391-C6-396
MICROSTRUCTURAL CHARACTERIZATION OF UDIMET 720 : A NICKEL-BASE ALLOYK.L. MORE et M.K. MILLER
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.
The microstructure and chemical composition of Udimet 720*, a nickel-base superalloy, has been characterized with a variety of techniques including atom probe field-ion microscopy (APFIM), analytical electron microscopy (AEM), and secondary ion mass spectroscopy (SIMS). It was determined that the microstructure of the alloy consists of a γ matrix with completely coherent γ precipitates. Large carbide particles form at the grain and twin boundaries as a result of the standard four-step heat treatment. There appears to be some segregation of boron and carbon to γ/γ interfaces. There is also a significant segregation of boron to the grain and twin boundaries.