LEGA PER L'ESTRUSIONE DELLE PALETTE DI UNA TURBINA A GAS,PALETTA COMPOSITA COMPRENDENTE TALE ESTREMITA'E METODO PER IL SUO OTTENIMENTO

摘要

A nickel base superalloy having a composition which provides a desirable combination of good oxidation and corrosion resistance and hot hardness is described. The alloy contains 21-25% Cr, 4.5-7% Al, 4-10% W, 2.5-7% Ta, 0.5-0.15% Y and 0.1-0.3% C. This alloy is useful as a blade tip element in a composite gas turbine blade.