Reconstruction and Repairs of Hot Section Blades, Combustion Chamber and Turbine Liner

Application:

Power plant industries


Certified ByTrust

Product Introduction:

When the blade or other parts used in the hot parts of the turbine are exposed to high temperature for a long time, various damages can occur to them. Damages may be physical or related to microstructure; Therefore, with the passage of time, the piece loses its initial efficiency. The repair of gas turbine parts takes place in different stages, during which the metallurgical and dimensional properties of the parts are restored. In general, the moving and fixed components of the gas turbine suffer from the following damages:

* External physical damage: External damage includes fatigue cracks, surface oxidation and corrosion, FOD and abrasion.

* Internal microstructural damage: Internal microstructural damage also includes the dissolution of carbides at the grain boundary, change in the gamma prime phase, change in grain size, and the structure of the nickelbased superalloy, which can be solved by rejuvenating heat treatment.

* Dimensional defect: Any dimensional defect that occurs on the blades over time is called a dimensional defect.

Technical Specifications:

The repair and restoration of blades is carried out by performing the following processes:

* Cleaning: Cleaning is usually done before inspection and before and after repair and restoration operations.

* Decoating: A large amount of coating is removed by a chemical process.

* Rejuvenation heat treatment: By working the part at high temperature, the dimensions and shapes of gamma prime deposits will change and also a brittle layer of carbides will be created along the grain boundary, which will reduce toughness and creep resistance.

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This product is a final B2B service.

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