Bearfoil
Relative to the stub pipe, I inadvertently forgot to mention the most important question of a component failure analysis. Is the material used the correct material? And if it is, is it within specification compositional limits? To determine this, a sample must be extracted for spectrographic analysis as close to the fracture as possible without destroying the fracture surface itself to eliminate off-composition material as being a factor.
Relative to the off-center counter boring, I am having a hard time envisioning how this could happen at the component manufacturing stage. In simplistic terms, one centers the cylinder in relationship to the cutting tool, lock it down and begin the machining process to the required depth.
so I can't figure out why or how it got to the shape depicted in the photo.
Turbine D