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- Article name
- Application of hot isostatic pressing to repair of the blades for gas-turbine engines
- Authors
- BERESNEV A. G., , razumovskiy@yahoo.com, Joint-Stock Company "Kompozit", Korolev, Moscow region, Russia
- Keywords
- hot isostatic pressing / engine blades / Ni base superalloys / operational porosity / repair
- Year
- 2012 Issue 1 Pages 5 - 11
- Code EDN
- Code DOI
- Abstract
- It is demonstrated that typical defects of the engine blades from Ni base superalloys after long operation (up to 11 749 hours) are the operational porosity and near-surface bands of carbides. The voids, which have appeared during long operation, aggravate the fatigue and other service characteristics of the blades. Hot isostatic pressing (HIP) reduces the size and number of operational micropores in the blades from Ni base superalloys with a polycrystalline (alloy GS6U) structure. As a result, HIP improves the mechanical properties of the blades. However, there is a critical time of operation after which the complete restoration of microstructure and properties becomes impossible. Application of the HIP, together with the standard heat treatment in the renovation of the blades after long operation can provide a virtually complete restoration of their structure and efficiency.
- Text
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