Microstructures and hardness of Ti-6Al-4V alloy staging castings under centrifugal field |
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Authors: | Yan-wei SUI Bang-sheng LI Ai-hui LIU Hai NAN Jing-jie GUO Heng-zhi FU |
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Affiliation: | [1]School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China [2]Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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Abstract: | By means of induction melting technology, Ti-6Al-4V alloy staging casting was made with the same rotation velocity and centrifugal radius. The effects of casting modulus on the grain size, the thickness of lamellar +β phase, and the Vickers hardness, as well as the relationships between Vickers hardness, grain size and thickness of lamellar +β phase were investigated. The results show that the greater the modulus, the larger the grain size and the thickness of lamellar +β phase, and the less the Vickers hardness. The relationship between Vickers hardness and grain size meets the Hall-Petch equation: Hv=353.45+74.17dG−1/2. The relationship between the Vickers hardness and the thickness of lamellar +β phase is expressed as Hv=2.45d + β2 - 35.96d + β + 476.84. |
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Keywords: | Ti-6Al-4V alloy centrifugal field modulus microstructure hardness |
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