Nickel-base superalloy for castings, free from Laves phase, and treated by means of hot isostatic pressing

摘要

A nickel base superalloy composition for castings, subjected to hot isostatic pressing and subsequent heat treatment is described. The invention alloy has an as-cast microstructure which is substantially free from Laves phase, even at slow solidification rates. As a result, the alloys is significantly more weldable than IN7l8. The alloy consists of:Ni + Co      50 to 66 wt %Cr      10 to 15 wt %Mo      0 to 3,3 wt %Nb + Ta      4,75 to 5,5 wt %Ti      0,65 to 1,15 wt %Al      0,4 to 0,8 wt %Fe      15 to 24 wt %