EFFECT OF ALLOYING ELEMENTS ON γ′SOLVUS TEMPERATURE OF Ni-BASE SUPERALLOYS

38 Ni-base experimental alloys were prepared with variation of the alloying elements over the following nominal ranges (in wt-％): Al 1.0--6.5, Ti 0.0--5.5, W 0.0----11.0, Mo 0.0--8.0, Nb 0.0--4.5, Ta 0.0--4.0, V 0.0--1.3 and Fe 0.0--9.0. In this investigation, γ' solvus temperature of these alloys were mea- sured and the effect of alloying elements were discussed. Relationship between γ' solvus temperature and alloy composition has been determined using regression analysis. The γ' solvus temperatures calculated by using this simple linear equation agree basically with those observed in 13 commercial Ni-base superalloys.