Effect of Wave Process of Plastic Deformation at Forging on the Fatigue Fracture Mechanism of Titanium Compressor Disks of Gas Turbine Engine
The low-cycle fatigue behavior of the VT3-1 titanium alloy (Ti–6Al–3Mo–2Cr alloy) under loading with a triangular and trapezoidal shape of cycle waveform was studied on round specimens prepared from forged compressor disks of a gas turbine engine. The filament type structure after forging has altern...
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MDPI AG
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| Online Access: | https://www.mdpi.com/1996-1944/14/8/1851 |
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| author | Andrey A. Shanyavskiy Alexey P. Soldatenkov Alexandr D. Nikitin |
| author_facet | Andrey A. Shanyavskiy Alexey P. Soldatenkov Alexandr D. Nikitin |
| author_sort | Andrey A. Shanyavskiy |
| collection | DOAJ |
| description | The low-cycle fatigue behavior of the VT3-1 titanium alloy (Ti–6Al–3Mo–2Cr alloy) under loading with a triangular and trapezoidal shape of cycle waveform was studied on round specimens prepared from forged compressor disks of a gas turbine engine. The filament type structure after forging has alternating filaments with the ductile and quasi-brittle state of the metal as a result of the wave process of plastic deformation during the metal forging process. The crack propagation, regardless of the cyclic waveform shape, occurs by the crack meso-tunneling mechanism: initially, the cracks propagate along the filaments by a quasi-brittle mechanism with the formation of a facetted pattern relief on the fracture surface reflecting the two-phase structure of the titanium alloy, and then, the bridge between the meso-tunnels is fractured with the formation of fatigue striations. The part of the crack growth duration <i>N</i><sub>p</sub>/<i>N</i><sub>f</sub> in the durability <i>N</i><sub>f</sub> is determined on the basis of measuring the fatigue striation spacing, and it depends on the crack path with respect to the material filaments. The growth of a fatigue crack in the case of in-service failure of a compressor disk of a gas turbine engine is considered, taking into account the crack meso-tunneling effect, and the fatigue crack growth duration in the disk is determined on the basis of quantitative fractography. |
| first_indexed | 2024-03-10T12:29:50Z |
| format | Article |
| id | doaj.art-51f27566d183465f887b122aaff10b8b |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T12:29:50Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-51f27566d183465f887b122aaff10b8b2023-11-21T14:43:05ZengMDPI AGMaterials1996-19442021-04-01148185110.3390/ma14081851Effect of Wave Process of Plastic Deformation at Forging on the Fatigue Fracture Mechanism of Titanium Compressor Disks of Gas Turbine EngineAndrey A. Shanyavskiy0Alexey P. Soldatenkov1Alexandr D. Nikitin2Aviation Register for Russian Federation, Airport Sheremetievo-1, PO Box 54, 141426 Moscow Region, Chimkinskiy State, RussiaAviation Register for Russian Federation, Airport Sheremetievo-1, PO Box 54, 141426 Moscow Region, Chimkinskiy State, RussiaInstitute of Computer Aided Design, 2nd Brestskaya street 19/18, 123056 Moscow, RussiaThe low-cycle fatigue behavior of the VT3-1 titanium alloy (Ti–6Al–3Mo–2Cr alloy) under loading with a triangular and trapezoidal shape of cycle waveform was studied on round specimens prepared from forged compressor disks of a gas turbine engine. The filament type structure after forging has alternating filaments with the ductile and quasi-brittle state of the metal as a result of the wave process of plastic deformation during the metal forging process. The crack propagation, regardless of the cyclic waveform shape, occurs by the crack meso-tunneling mechanism: initially, the cracks propagate along the filaments by a quasi-brittle mechanism with the formation of a facetted pattern relief on the fracture surface reflecting the two-phase structure of the titanium alloy, and then, the bridge between the meso-tunnels is fractured with the formation of fatigue striations. The part of the crack growth duration <i>N</i><sub>p</sub>/<i>N</i><sub>f</sub> in the durability <i>N</i><sub>f</sub> is determined on the basis of measuring the fatigue striation spacing, and it depends on the crack path with respect to the material filaments. The growth of a fatigue crack in the case of in-service failure of a compressor disk of a gas turbine engine is considered, taking into account the crack meso-tunneling effect, and the fatigue crack growth duration in the disk is determined on the basis of quantitative fractography.https://www.mdpi.com/1996-1944/14/8/1851forged titanium alloylow-cycle fatiguecycle wave formdurabilitycrack meso-tunnelingfractography |
| spellingShingle | Andrey A. Shanyavskiy Alexey P. Soldatenkov Alexandr D. Nikitin Effect of Wave Process of Plastic Deformation at Forging on the Fatigue Fracture Mechanism of Titanium Compressor Disks of Gas Turbine Engine Materials forged titanium alloy low-cycle fatigue cycle wave form durability crack meso-tunneling fractography |
| title | Effect of Wave Process of Plastic Deformation at Forging on the Fatigue Fracture Mechanism of Titanium Compressor Disks of Gas Turbine Engine |
| title_full | Effect of Wave Process of Plastic Deformation at Forging on the Fatigue Fracture Mechanism of Titanium Compressor Disks of Gas Turbine Engine |
| title_fullStr | Effect of Wave Process of Plastic Deformation at Forging on the Fatigue Fracture Mechanism of Titanium Compressor Disks of Gas Turbine Engine |
| title_full_unstemmed | Effect of Wave Process of Plastic Deformation at Forging on the Fatigue Fracture Mechanism of Titanium Compressor Disks of Gas Turbine Engine |
| title_short | Effect of Wave Process of Plastic Deformation at Forging on the Fatigue Fracture Mechanism of Titanium Compressor Disks of Gas Turbine Engine |
| title_sort | effect of wave process of plastic deformation at forging on the fatigue fracture mechanism of titanium compressor disks of gas turbine engine |
| topic | forged titanium alloy low-cycle fatigue cycle wave form durability crack meso-tunneling fractography |
| url | https://www.mdpi.com/1996-1944/14/8/1851 |
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