The crystal follows one of two paths into the airfoil mold. A triangular ramp leads from the pigtail to the forward and trailing edges of the airfoil, Corrigan said. You can nucleate another grain. If that happens, you'll see it when you etch. On Land and in the Air For aircraft turbines, lightness, high strength, and stability are key attributes of the blades and vanes, Corrigan said.
Weight is less of a concern on stationary gas turbines.
On the other hand, corrosion resistance is a big factor for stationary turbines. At the time, mainly aircraft alloys were available. The chromium in aircraft engine alloys typically alights below 10 percent, he added. Both equiax and d.s. Very big revs.