Although titanium castings have been used in aerospace structures for decades, those uses have largely been in secondary applications. Expanding the use of titanium castings in critical applications would be encouraged by a better understanding of investment casting defects in titanium alloy systems. This paper describes several types of casting-related defects that are identifi ed as potentially affecting the design life of a structure: inclusions, voids, and weld repair defects.

No abstract

No abstract

A program was undertaken to evaluate the relative shapemaking capabilities of metal can plus HIP and Crucible's ceramic mold plus HIP methods. Using a small but co:nplex disk/ shaft assembly, it was shown that the ceramic mold approach afforded the greatest potential for very complex shapes. This process was then scaled to produce a third stage turbine disk for the F-102 engine. Properties of the HIP plus heat-treated PA-101 alloy met or exceeded the program goals and a weight savings of 70 lb (32 kg) was demonstrated.