Influence of the hip process on the properties of as-cast Ni-based alloys

Abstract

The main goal of this work was to evaluate the application of the samples prepared by centrifugal casting as the test samples for a tensile test. Selected types of modified superalloys were prepared as experimental samples. The samples were molten by vacuum-induction melting and then cast centrifugally into a shaped graphite mould. The final castings had the shape corresponding approximately to the test specimens. Some of the samples were subjected to hot isostatic pressing (HIP). After HIP the castings contained substantially fewer casting defects. Selected mechanical properties were compared for the samples in the as-cast state and after HIP. For the majority of the investigated alloys the HIP process led to an increase in the strength and ductility.