A Mathematical Framework for Cyclic Life Prediction of Directionally Solidified Nickel Superalloys
| Periodical | Advanced Materials Research (Volume 278) |
|---|---|
| Main Theme | Euro Superalloys 2010 |
| Edited by | M. Heilmaier |
| Pages | 363-368 |
| DOI | 10.4028/www.scientific.net/AMR.278.363 |
| Citation | Roland Mücke, 2011, Advanced Materials Research, 278, 363 |
| Online since | July, 2011 |
| Authors | Roland Mücke |
| Keywords | Anisotropy, Directionally Solidified, Fatigue, Lifetime Prediction, Superalloy |
Modern gas turbines utilize single crystal (SX) and directionally solidified (DS) nickel superalloys which hold a higher cyclic life resistance and an improved creep rupture strength compared to their conventionally cast (CC) version. Both, SX and DS materials feature a significant direction dependence of material properties, which needs to be considered in the constitutive and lifing models. In this context, the paper presents a mathematical framework of cyclic life prediction. Although the method is developed for DS nickel alloys with transverse isotropic material behaviour, a generalisation to common orthotropic materials inclu¬ding SX is straightforward. The proposed procedure is validated by two examples. Moreover, an application to turbine components is shown.
