Publications Repository - Gdańsk University of Technology

This article presents an analysis of the applicability of laser surfacing of the exhaust valve face of a marine diesel engine using cobalt-based powder. After preparation by machining, the selected valves were subjected to laser surfacing using a high-power ROFIN DL020 laser. The EuTroLoy 16012 powder was used in the surfacing process. One of the valves was cut and subjected to metallographic examination and hardness measurements, while the other valves were assembled in the engine, which worked for approx. 3000 h. The tests conducted for the initial condition showed a dendritic structure of the surfacing weld, characteristic for surfaced layers with carbide inclusions uniformly deposited in interdendritic areas and a minimally changed structure of the steel substrate. Similar tests were carried out for the valves after their period of operation. The valves' faces showed little wear. The microstructure of the surface weld was found to have minor changes mainly due to the effects of diffusion processes occurring in the operating temperature and a decrease in hardness. The laser surfacing technique has proven very useful for the regeneration of marine engine valves.

Authors

• dr inż. Hanna Smoleńska link open in new tab ,
• prof. dr hab. inż. Jerzy Łabanowski link open in new tab ,
• Włodzimierz Kończewicz