This is what can happen when you operate a turbocharger out side its manufactured specifications.
This Evo9 turbocharger has been subjected to over boost and over speed of turbine shaft assembly. The turbocharger is manufactured with some very exotic materials, allowing very fast shaft speed response from low inertia. While these materials are some of the best possible for their application it also means you can not take them out side their working window with out causing damage to components. In this example the compressor wheel has exploded. From the image you can see the path the exploded part of the compressor wheel took across the defuser, depending on what speed the turbine assembly was doing at time of exploitation, the compressor piece could be traveling at a greater velocity than a bullet from a small bore riffle.
