The turbine wheel more than likely came from the manufacturer like that. If the blade bent like that during normal operation the unit would begin to vibrate badly. If you are concerned about the turbine wheel now then perhaps just change it for piece of mind since JJ sells parts. Either way make sure to re-balance the turbine before you run this again.
Andy
if
Originally Posted by
Xairflyer
If its only discoloured then just a matter of cleaning it up, only long time effect will be bigger clearances etc, just would change it when noticeable drop in power, but shows how poor quality the metal is as true inconel wont do this so soon.
Whats your shaft like ? normally when they lie up for a while you the shaft starts to corrode