Microbeam synchrotron radiation diffraction study of a monocrystalline nickel-base turbine blade after service
- Univ. Erlangen-Nuernberg, Erlangen (Germany). Inst. fuer Werkstoffwissenschaften; and others
In turbine blades subjected to service, the hot regions near the leading and trailing edges are subjected to temperatures up to 1,100 C, whereas the regions near the cooling channels are subjected to temperatures of about 800 C. These temperature gradients cause strong inhomogeneities in the local thermal and mechanical loads. In the present paper a monocrystalline turbine blade of the nickel-base superalloy CMSX-6 with an orientation near [001] from a developmental turbine was investigated with high lateral resolution using a Bragg-Fresnel focusing optics in combination with synchrotron radiation at the European Synchrotron Radiation Facility (ESRF) in Grenoble. The blade had been exposed to service in so-called accelerated mission tests for several hundred hours in two test turbines. In the bulk of the material, a {gamma}/{gamma}{prime} raft structure perpendicular to the [001]-direction is observed. At the surface, the protective aluminide coating is visible. Between these two regions, a {gamma}{prime}-enriched zone exists.
- OSTI ID:
- 554033
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 9 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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