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Gas Turbine Repair Technology industrial gas turbines. These can be catego- rized under creep, thermal fatigue, oxidation, incipient melting and many forms of mechani- cal damage. Each failure mode presents differ- ent requirements for component repair. Nozzles that are candidates for repair undergo an initial metallurgical evaluation. From these results, engineering recommendations are made on the nozzle’s continued serviceability. The reparability and/or weldability of the noz- zle and the required repair methods and opera- tions are determined. First, a triangle-shaped specimen is cut from the partition’s trailing edge (Figure 2). It is mount- ed and polished for metallurgical evaluation (specimen “MetLab”). The metallurgical analy- sis includes microstructural evaluations of the “as-received” and “heat-treated” conditions, and observations of intergranular oxidation (IGO), chromium migration (CM), chromium deple- tion (CD), carbide precipitates (CP) and wall thickness. Figure 3 shows a typical nozzle cool- ing hole with chrome depletion and oxidation, as indicated by the lighter contrast regions on the specimen’s external surfaces. Specimens may be taken from up to 10 par- titions. The specimens are taken from the noz- zle segment partition which is closest to the cen- ter of each adjacent transition piece. This cen- ter area experiences the highest temperatures and reflects the nozzle’s most severe operating conditions. Sidewall specimens may also be taken for evaluation if the nozzle has large areas of distress. If the MetLab inspected partition in- dicates a severe metallurgical problem, addi- tional samples are taken on adjacent partitions to determine the extent of the distress. The primary method of dimensional restora- tion to the nozzle is weld repair. To enhance and improve weld repair life, an advanced filler material was developed for repair of cobalt base (X-40, X-45 and FSX-414) investment cast noz- zle segments. This material breakthrough was accomplished with the patented creation of NozzaloyTM. NozzaloyTM repairs can also be ap- plied over previously applied Activated Diffusion Healing (ADH) repairs. Figure3. Metallurgicalevalutionshowingchrome depletion/oxidation Figure 4. NozzaloyTM repair over ADH Figure 2. Trailing edge specimen GE Power Systems ■ GER-3957B ■ (04/01) 4PDF Image | Gas Turbine Repair Technology GE
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