Applications of composite gas turbine components. Phase I. Semi-annual technical progress report. [Composite or hybrid design with different facts of the component bonded together]
Heavy-duty, air-cooled gas turbines utilize relatively large superalloy buckets and nozzle guide vanes. These large components, particularly buckets, must demonstrate a variety of properties. The airfoil vane requires excellent surface stability with high creep and low-cycle fatigue (LCF) strength. The dovetail requires excellent tensile strength and low-cycle fatigue (LCF) properties. Conventional buckets are fabricated as one single casting or forging in which compromises in these properties are inevitable, and the full capabilities of the superalloys used are rarely optimized along each individual line. A unique approach toward improved performance in key properties is to integrate the best material for each part of a hot section bucket or nozzle into a bonded composite component, or a hybrid component. A hybrid bucket is a superalloy part composed of a variety of alloys bonded into one integral part. Each segment is tailored to perform a specific function with greater reliability and performance than possible with contemporary monolithic parts. An example is a directionally-solidified (DS) airfoil vane bonded to a dovetail section of forged/PM superalloy. Several nickel base superalloy combinations which have been diffusion bonded using hot isostatic pressing (HIP). This technique enables large gas turbine buckets to be fabricated using materials with improved creep and low cycle fatigue life for the airfoil and greater high temperature tensile strength in the dovetail. The program will specifically investigate three directionally solidified airfoil alloys and two powdered metal dovetail alloys. This effort will include heat treat studies, physical metallurgy and high temperature tensile testing for all 5 alloys in their HIP bonded condition.
- Research Organization:
- General Electric Co., Schenectady, NY (USA). Gas Turbine Div.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC01-80ET17005
- OSTI ID:
- 6426356
- Report Number(s):
- DOE/ET/17005-1
- Country of Publication:
- United States
- Language:
- English
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