| 2000 №02 (09) | 2000 №02 (11) |
The Paton Welding Journal, 2000, #2, 39-40 pages
Electron beam remelting of operating surface of exhaust valves of aircraft engines
A.V. Bondar1, M.V. Eryomin1, S.N. Fyodorov1, V.V. Shurupov2
1Mechanical Works, Voronezh, Russia2State Technical University, Voronezh, Russia
Abstract
Problems of repair of flaws of a discontinuity type, which are formed in a layer of the operating surface of aircraft engine exhaust valve, surfaced with a flame method, is considered. It is shown that, when using electron beam treatment with an ellipsoid scanning of beam, the flaws are eliminated in the deposited surfaces. During electron beam treatment the inner structure of the deposited layer is changed by refining and reorienting chromium carbides that increases the microhardness of the working surface.
Keywords: electron beam remelting, valve, surfacing zone, microstructure, chromium carbide