Microstructure, hardness and cavitation erosion behaviour of Ti-6Al-4V laser nitrided under different gas atmospheres
| Autor: | B. Brenner, B. Winderlich, S. Bonß, J. Bretschneider, S. Jacob, J. Kaspar |
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| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
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Materials science vanadium alloys Metallurgy chemistry.chemical_element Surfaces and Interfaces Nitride Condensed Matter Physics Microstructure Nitrogen hardness Surfaces Coatings and Films Solid solution strengthening Brittleness chemistry cavitation Martensite titanium alloys Materials Chemistry aluminium alloy Nitriding Titanium laser hardening |
| Popis: | The present paper reports on a comparative study of the microstructure, hardness and cavitation erosion behaviour of Ti-6Al-4V laser nitrided under different gas atmospheres with nitrogen concentrations of 0-25%. By varying the nitrogen content of the gas atmosphere, the structure and hence the hardness and cavitation erosion behaviour of the laser nitrided layers can be controlled in a wide range. With increasing nitrogen content of the gas atmosphere, the structure within the laser nitrided layers characteristically changed from martensitic alpha'-Ti to a fine mixture of alpha- and beta-Ti grains, finally leading to the formation of different titanium nitrides. The study revealed that the increase of hardness and cavitation erosion resistance can be mainly attributed to solid solution hardening of the nitrogen. It is shown that optimum cavitation erosion resistance is only achieved if crack free layers containing no brittle titanium nitrides are produced. |
| Databáze: | OpenAIRE |
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