Development of Wear-Resistant Monolithic Structural Steel Composition for Aircraft Gear Wheels Based on Phase Analysis

Resumo

A wear-resistant steel is developed not requiring chemical-heat treatment (CHT) (carburizing, carbonitriding) used for aircraft engineering units. The new steel has double the level of wear resistance than that with CHT. The cast steel optimum phase composition is determined guaranteeing good wear resistance. It is established that the amount of carbide phase in solid solution may be ≥ 8.5 wt.%, and 90% of carbide is based on vanadium. In order to obtain the required level of steel properties not less than 0.35 wt.% chromium, and 0.5 wt.% vanadium should be in solid solution. The amount of residual austenite is not more than 15%.