High-Velocity Erosion of VT6 Titanium Alloy with ZrN Protective Coating
S. A. Atroshenko1,2, R. Z. Valiev3, N. A. Kazarinov2, N. F. Morozov2, R. R. Valiev3, Ya. N. Savina2, M. N. Antonova2, A. D. Evstifeev2
1Institute for Problems in Mechanical Engineering RAS, St. Petersburg, Russia
2St. Petersburg State University, St. Petersburg, Russia
3Ufa University of Science and Technology, Ufa, Russia
Keywords: VT6 titanium alloy, coarse- and ultrafine-grained states, ZrN coating, dynamic erosion, microhardness, erosion failure
Abstract
The processes of wear and failure of VT6 alloy with a ZrN protective coating in the initial coarse-grained and ultrafine-grained states under high-velocity dynamic erosion by corundum particles with average sizes of 109, 58, and 23 μm in an air flow at velocities of 50 ÷ 250 m/s and exposure times of 30, 60, and 300 s are experimentally studied. The experiments determined the fraction of viscous failure, the depth of the damaged layer, changes in the alloy microstructure near the eroded surface with and without coating, as well as weight loss and surface roughness. It is shown that under high-velocity erosion, wear and failure processes of the alloy strongly depend on exposure time, erosion velocity (particle velocity), particle size, and substrate structure.
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