Gamma prime precipitate morphology in CMSX-2 Superalloy

GES ALEJANDRO MARIO; FORNARO OSVALDO; PALACIO HUGO A.

Indianápolis

Congreso; TMS Fall Meeting; 2001

The Minerals Materials Science

<!-- @page { margin: 2cm } P { margin-bottom: 0.21cm; direction: ltr; color: #000000; widows: 2; orphans: 2 } -->The aim of the present work is to describe the effect of the heat treatment and the thermal exposure upon the gamma prime precipitate in a CMSX-2 superalloy. The samples were obtained from bars vacuum induction melted, which were solidified in polycrystalline way. The application of initial heat treatment such as solution (SHT), post-solution (PSHT) and precipitation heat treatment (PHT) permit us to obtain different size and distribution of gamma prime. Afterwards, the samples were artificially aged at different constant temperature, and studied in absence of applied strength. The evolution of the rate constant k at several temperatures was estimated and subsequently the activation energy for coarsening was determined. The gamma prime size against microhardness was evaluated. These observations and their possible implications on the behavior of these materials at high temperature were discussed.