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متالوژی::
ایرفویل توربین
Significant advances in metal temperature, stress, and environmental capabilities for turbine airfoils have been obtained from the development of directionally solidified, columnar grain and single-crystal casting processes.
An addition of hafnium of most creep resistant alloys for turbine airfoils has been deter- mined to facilitate production by the investment casting method.
The final age results in a combination of moderate ten- sile strength and rupture life required for longer lasting turbine airfoils.
Controlled solidification of turbine airfoils was initially achieved with MAR-M 200.
The longitudinal elastic and torsional modulii in the 001 direction are independent of this orientation, consequently the natural frequencies of vibration of the bending-torsion modes of a gas turbine airfoil do not depend on the angle of the secondary orientation.
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