How the Sub-Surface Microstructure of a Ti6Al4V Tribopair Evolves Due to Dry Friction at High Sliding Velocity
| Autor: | J. Meriaux, Albert Tidu, Guillaume Chassaing, Laurent Faure, Nathalie Gey |
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| Přispěvatelé: | SNECMA Villaroche [Moissy-Cramayel], Safran Group, Laboratoire de mécanique Biomécanique Polymère Structures (LaBPS), Université de Lorraine (UL), Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Ecole Nationale d'Ingénieurs de Metz (ENIM), V. Venkatesh, A. L. Pilchak, H. L. Fraser, M. A. Imam, Y. Kosaka, H. J. Rack, A. Chatterjee, A. Woodfield, J. E. Allison, S. Ankem, R. Boyer, J. Christodoulou |
| Rok vydání: | 2016 |
| Předmět: |
Surface (mathematics)
Equiaxed crystals Materials science Titanium alloy [CHIM.MATE]Chemical Sciences/Material chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 020303 mechanical engineering & transports 0203 mechanical engineering Martensite Microscopy Composite material 0210 nano-technology Layer (electronics) Electron backscatter diffraction |
| Zdroj: | Proceedings of the 13th World Conference on Titanium Proceedings of the 13th World Conference on Titanium, Aug 2015, San Diego, CA, United States. pp.1643-1648, ⟨10.1002/9781119296126.ch275⟩ |
| Popis: | International audience; As part of aeronautical applications, friction experiments were performed between Ti6Al4V tribopair with a-equiaxed microstructure. Severe conditions were applied: less than 2 ms sliding at 40 m/s (apparent normal pressure of 110 MPa). Measurements and simulations indicated that the 25 μm of the top surface was heated in β for less than 1 ms and fast cooled. The microstructure in this thermally and mechanically affected zone was characterized by SEM, EDS and EBSD. Further Crossbeam microscopy was used to visualize the microstructure evolution through the affected layer. Far from the sliding surface, the microstructure showed prior equiaxed β grains fully transformed to martensite but also untransformed β phase. Closer to the contact surface, the grains were severely elongated along the sliding direction. Also 3D imaging emphasized non-expected recrystallized α grains near the contact interface. These observations were analyzed in detail to get new insight in the thermomechanical path undergone by the material top surface. |
| Databáze: | OpenAIRE |
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