Abstract
The effects of initial heat treatment on the tensile and creep properties of alloy IN 939 are described and explained in terms of microstructural and microcompositional variations. It is demonstrated that a substantial increase in room temperature properties and in short-term high-temperature properties can be obtained by a modified three stage, 14 h heat treatment. Long-term elevated-temperature creep properties are found to be insensitive to initial heat treatment, since in this case the evolution of the microstructure is largely determined by test conditions. A comparison is made between IN 939 and IN 738, and it is shown that the very long-term high-temperature creep properties of the two alloys are closely similar. The selection of heat treatments to obtain optimum properties over the entire range of temperature and stress conditions encountered within a turbine blade is also discussed.MST/434
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