首页|Cavitation erosion mechanism and microstructural design of pure titanium
Cavitation erosion mechanism and microstructural design of pure titanium
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NSTL
Elsevier
Pure Ti has potential applications in the desalination and chemical industries, as well as in the construction of seagoing vessels. In such applications, the degradation of metals via cavitation erosion can be a significant concern. The present work examined the cavitation erosion mechanism of pure Ti using electron back-scatter diffraction, scanning electron microscopy and transmission electron microscopy. Triple junctions and grain boundaries were determined to be the preferential sites for the initiation of cavitation damage such that, after a 4 h exposure to cavitation erosion, 87% of triple junctions and 36% of grain boundaries were eroded. The misorientation angles of the damaged grain boundaries were all greater than 42 degrees. The cavitation damage was determined to have been induced by strain concentration and this damage appeared in the form of extrusions, microcracks and subsequent material removal. The material removal propagated slowly toward grain interiors via the formation of small pieces of spatting. Finally, coarse grains were found to increase resistance to cavitation erosion; other approaches to modifying the microstructure of pure Ti are also discussed herein.
NSTL
Elsevier
