http://worldcat.org/entity/work/id/13637850

Heat transfer modeling and analytical quenching of a powder metallurgy turbine disk during heat treatment

A conduction heat transfer analysis was used to model experimental internal metal temperatures measured by thermocouples imbedded in superalloy turbine task disk 'blanks' of varying thickness while they were quenched during heat treatment in several media, including oil, salt, and air. The computer model deduced effective values of the average surface heat transfer coefficient as the superalloy part cooled from the solution temperature during heat treatment. The resulting heat transfer coefficients were applied to actual Hot Isostatically Pressed (As-HIP) turbine disk shapes (target sonic) by a modified computer analysis to determine local cooling rates and cooling rate variations within the quenched disks. An assessment was made of the expected variation in tensile properties that would be created in the disk due to heat transfer and geometrical shape tests. (Author).

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