Gas Turbine Blade Repair: Extend Component Life with FSR®

Liburdi Turbines Services developed the patented Full Solution Rejuvenation® (FSR®) process to restore gas turbine blades to like-new strength and extend service life well beyond typical OEM limits.

Why Gas Turbine Blades Degrade Over Time

Creep and Thermal Aging in Superalloys

Gas turbine blades operate under extreme temperature and stress. Over time, thermal aging and creep cause overaging of the γ′ precipitate structure, reducing rupture strength and pushing components below safe performance levels. Under standard practices many blades are removed after two cycles due to microstructural degradation (see Figure 1).

Gas turbine blade creep strength decreases with service time, entering risk zone
Figure 1: Progressive loss of gas turbine blade creep strength with service time.

How the FSR® Process Restores Gas Turbine Blades

FSR® reverses microstructural degradation to restore alloy strength and extend the life of high-value blades.

There are two main phases:

  1. Hot Isostatic Pressing (HIP):

    Collapses internal creep voids in the alloy, re-densifying the blade’s microstructure.

  2. Advanced Heat Treatments:

    Dissolves overaged γ′ and regrows precipitates to optimal size, recovering creep strength and ductility.

Figures 2 and 3 illustrate recovery of microstructure and properties at the microscopic level.

Gas turbine blades before and after FSR repair showing restored condition and finish
Figure 2: FSR® reverses thermal aging damage in superalloys.
FSR restores turbine blade microstructure by reversing service-induced superalloy damage
Figure 3: FSR® reverses stress damage in superalloys.

Microstructural Recovery and Life Extension

Microscopic voids and γ′ overaging drive strength loss. Applying FSR® at regular intervals restores creep strength, extends turbine blade life, and defers costly replacements. Figure 4 highlights the long-term benefit of FSR® compared to untreated components.

Chart showing part service time and how Full Solution Rejuvenation increases gas turbine part life.
Figure 4: Turbine blade rejuvenated creep strength with service time

Where FSR® Applies: Alloys, Coatings, and Components

Cast and directionally solidified blades

Broadly proven across a wide range of turbine blade applications.

Single-crystal super alloys

Applicable with careful process control to avoid recrystallization; minimize cold work and verify via metallography.

Coating Removal and Reapplication

External and internal coatings are stripped before FSR® and reapplied after heat treatment.

Dimensional control

Minor stress-relief distortion is managed by repair sequencing, weld restoration, and finish machining.

Quality Assurance and Validation

Each program is controlled and validated through:

Stress-Rupture Testing

Stress-rupture testing is performed on representative material from the production set to confirm restored creep strength and life capability.

Microstructural Verification

Microstructural analysis verifies precipitate size, distribution, and grain-boundary condition to ensure the alloy has been properly restored.

Process Control of HIP and Heat Treatment

Time, temperature, and pressure are tightly controlled during HIP and subsequent heat treatments to ensure consistent, repeatable results.

Benefits of FSR® for Gas Turbine Blade Repair

Extend Gas Turbine Blade Life and Reduce Costs

Applied proactively, FSR® can save operators hundreds of thousands of dollars across the life of a set.

Plan Your Gas Turbine Blade Repair Strategy

Planning a gas turbine blade repair or evaluating life-extension options? Our team can review alloy, run conditions, and inspection data to recommend an FSR® schedule.

Contact: info@liburditurbineservices.com